| The Markbag(tm) [message #150701] |
Sat, 26 November 2011 15:28  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
Late last week I finally found time to copy the mounting plate drawings that Mark G supplied for his Firestone bag discovery. I obtained two bags #FI 9294 a few weeks ago and dove in on the mounting plates as described by Mark. I did make one alteration however to the standoff. The mounting flange of the bogie will fit a 2 1/2 " wide standoff and I had some laying around and used that instead. I also made the diameter of the plates 9 3/4" because I plan to add a blow out shroud to the plates to protect the bag and the air fill line. The mounting plate and the standoff are 1/4". I used grade 5, 3/4" by 2" coarse bolts to hold the standoff to the bogie with integrated locking type flange head on the nut. Ran out of time last week due to turkey day and came in this morning to see how the Markbag(tm) compared. Here is how the Markbag(tm) compared to the oem as I left one tired oem bag on the right side and put the markbag on the left. For the purpose of consistency I put the non test side at a height of about 15 1/2". All of my height measurements were made from the center bottom of a straight edge(in my case a bamboo paint stir stick) resting across the bogie grease fittings.
ORIGINAL BAG
Max height 17"
Min height 9"
Pressure at max height 105psi
deflation time 2 minutes and 11 seconds from full up to bottom out.
Full inflate from full deflate 10 minutes and 29 seconds.
MARKBAG
Max height 16 3/4" to 16 7/8"(floor on this side has small damage where measuring)
Min height 9 1/2"
Pressure at max height 88 psi
Deflation time 3 minutes and 6 seconds
Full attainable lift height from empty in 5 minutes and 40 seconds
Some observations
1. with both bags deflated the frame is almost touching the concrete maybe an inch away from the collapsed rear frame gliders
2. the braided rear brake lines added by the p.o. bind when bogies pivot up at full down. The hold downs need to allow the lines to slide horizontally or have an exaggerated loop near junction block to avoid pinching of the line.
3. The Markbag only took a minute and 32 seconds to go from full deflate to 16" and another 4 minutes to get the last 3/4"
4. The Markbag reached full height in 5 minutes and 40 seconds but ran it to 88 psi from around 60 just to see if I could get a little more. From empty to 88 psi took 6 minutes and 45 seconds
5. The oem bag moved through its upward lift much slower in its mid travel than the Markbag and really slowed durring the last 3/4" to inch of lift.
6. Cuting the plates round and centering the mounting holes was a bit challenging. I used the cone portion of the Markbag as a template for the diameter cut line and the center hole location. When aligning the standoffs I used a 1/2"bolt passed up from the bottom side of the plate and centered it through the 3/4" standoff mount hole,spun a nut down on it to hold it in alignment and marked the plate where the corners of the standoff touched with a sharpie. You cannot do this once the 3/4" bolt is welded in and you cannot get the 3/4" bolt into the standoff when it is on the plate. If a nut was welded into the standoff instead of a bolt then it could be aligned at the end but this could make bag instal a little more cumbersome.
7. Cant give you a ride comparison as my coach is currently not roadworthy and I have driven it very little since purchase as it is undergoing a bit of a restoration.
8. I did not do a timed lift to travel mode as I do not have a way to tell when one bag stops filling
9. The interior/rear body cap and glass/side windows and air conditioners/water tank/refridgerator and all cabinetry are removed from my coach but the 6kw onan is in place. Both of my fuel tanks are full.
10. Have a lot of play in left front bogie arm. Left rear seems okay. Kinda afraid to check right side 
Out to tac the other side together so I can tig weld the final beads at home shop. Body is all painted except the very front portion which ill do when windshields are out once shes back at home shop. Got to get her home to finish the inside and instal the Howell efi as it turns out I have 3 Quadra Jet carbs none of which are the motor home application.
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #150775 is a reply to message #150773] |
Sun, 27 November 2011 15:21  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
I was thinking of looking into having the individual parts cut and bored
by a fabrication shop that can set up a batch on automated equipment which
would give a more uniform product in less time. A jet cut of some sort
would eliminate the need to finish grind the standoffs and especially the
plates. Also not sure of the demand. Kindof wondering what sort of interest
there might be. I dont know what a shop might charge........yet
Im going to weld up today and bring back to my body shop tomorrow and paint
them. Once that is done I will post more pictures to the same picassa
account since I had no luck with the GMC site
Sully
77 Royale
On Sun, Nov 27, 2011 at 12:56 PM, Dennis Sexton <dennisfsexton@aol.com>wrote:
>
>
> Sully,
>
> Thank you for taking time to detail your install and put some numbers to
> the height and pressure questions.
>
> Anyway to estimate what a shop might charge to fabricate the mountings?
>
> Looks very good.
>
> Dennis
>
> sgltrac wrote on Sat, 26 November 2011 15:28
> > Late last week I finally found time to copy the mounting plate drawings
> that Mark G supplied for his Firestone bag discovery. I obtained two bags
> #FI 9294 a few weeks ago and dove in on the mounting plates as described by
> Mark. I did make one alteration however to the standoff. The mounting
> flange of the bogie will fit a 2 1/2 " wide standoff and I had some laying
> around and used that instead. I also made the diameter of the plates 9 3/4"
> because I plan to add a blow out shroud to the plates to protect the bag
> and the air fill line. The mounting plate and the standoff are 1/4". I used
> grade 5, 3/4" by 2" coarse bolts to hold the standoff to the bogie with
> integrated locking type flange head on the nut. Ran out of time last week
> due to turkey day and came in this morning to see how the Markbag(tm)
> compared. Here is how the Markbag(tm) compared to the oem as I left one
> tired oem bag on the right side and put the markbag on the left. For the
> purpose of consistency I put the no
> n test side at a height of about 15 1/2". All of my height measurements
> were made from the center bottom of a straight edge(in my case a bamboo
> paint stir stick) resting across the bogie grease fittings.
> >
> > ORIGINAL BAG
> > Max height 17"
> > Min height 9"
> > Pressure at max height 105psi
> > deflation time 2 minutes and 11 seconds from full up to bottom out.
> > Full inflate from full deflate 10 minutes and 29 seconds.
> >
> > MARKBAG
> > Max height 16 3/4" to 16 7/8"(floor on this side has small damage where
> measuring)
> > Min height 9 1/2"
> > Pressure at max height 88 psi
> > Deflation time 3 minutes and 6 seconds
> > Full attainable lift height from empty in 5 minutes and 40 seconds
> >
> > Some observations
> > 1. with both bags deflated the frame is almost touching the concrete
> maybe an inch away from the collapsed rear frame gliders
> > 2. the braided rear brake lines added by the p.o. bind when bogies pivot
> up at full down. The hold downs need to allow the lines to slide
> horizontally or have an exaggerated loop near junction block to avoid
> pinching of the line.
> > 3. The Markbag only took a minute and 32 seconds to go from full deflate
> to 16" and another 4 minutes to get the last 3/4"
> > 4. The Markbag reached full height in 5 minutes and 40 seconds but ran
> it to 88 psi from around 60 just to see if I could get a little more. From
> empty to 88 psi took 6 minutes and 45 seconds
> > 5. The oem bag moved through its upward lift much slower in its mid
> travel than the Markbag and really slowed durring the last 3/4" to inch of
> lift.
> > 6. Cuting the plates round and centering the mounting holes was a bit
> challenging. I used the cone portion of the Markbag as a template for the
> diameter cut line and the center hole location. When aligning the standoffs
> I used a 1/2"bolt passed up from the bottom side of the plate and centered
> it through the 3/4" standoff mount hole,spun a nut down on it to hold it in
> alignment and marked the plate where the corners of the standoff touched
> with a sharpie. You cannot do this once the 3/4" bolt is welded in and you
> cannot get the 3/4" bolt into the standoff when it is on the plate. If a
> nut was welded into the standoff instead of a bolt then it could be aligned
> at the end but this could make bag instal a little more cumbersome.
> > 7. Cant give you a ride comparison as my coach is currently not
> roadworthy and I have driven it very little since purchase as it is
> undergoing a bit of a restoration.
> > 8. I did not do a timed lift to travel mode as I do not have a way to
> tell when one bag stops filling
> > 9. The interior/rear body cap and glass/side windows and air
> conditioners/water tank/refridgerator and all cabinetry are removed from my
> coach but the 6kw onan is in place. Both of my fuel tanks are full.
> > 10. Have a lot of play in left front bogie arm. Left rear seems okay.
> Kinda afraid to check right side :lol:
> >
> > Out to tac the other side together so I can tig weld the final beads at
> home shop. Body is all painted except the very front portion which ill do
> when windshields are out once shes back at home shop. Got to get her home
> to finish the inside and instal the Howell efi as it turns out I have 3
> Quadra Jet carbs none of which are the motor home application.
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #150777 is a reply to message #150775] |
Sun, 27 November 2011 15:39 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
|
Senior Member |
|
|
Sully,
Thank you.
I think there will be people looking for single bag options -- preferences for ride, availability of the replacement bag and $ value may be some of the reasons.
Others will want the most proven design available or one they believe improves performance over the OEM.
Look forward to your photos.
Regards,
Dennis
| sgltrac wrote on Sun, 27 November 2011 15:21 |
I was thinking of looking into having the individual parts cut and bored
by a fabrication shop that can set up a batch on automated equipment which
would give a more uniform product in less time. A jet cut of some sort
would eliminate the need to finish grind the standoffs and especially the
plates. Also not sure of the demand. Kindof wondering what sort of interest
there might be. I dont know what a shop might charge........yet
Im going to weld up today and bring back to my body shop tomorrow and paint
them. Once that is done I will post more pictures to the same picassa
account since I had no luck with the GMC site
Sully
77 Royale
On Sun, Nov 27, 2011 at 12:56 PM, Dennis Sexton <dennisfsexton@aol.com>wrote:
>
>
> Sully,
>
> Thank you for taking time to detail your install and put some numbers to
> the height and pressure questions.
>
> Anyway to estimate what a shop might charge to fabricate the mountings?
>
> Looks very good.
>
> Dennis
>
> sgltrac wrote on Sat, 26 November 2011 15:28
> > Late last week I finally found time to copy the mounting plate drawings
> that Mark G supplied for his Firestone bag discovery. I obtained two bags
> #FI 9294 a few weeks ago and dove in on the mounting plates as described by
> Mark. I did make one alteration however to the standoff. The mounting
> flange of the bogie will fit a 2 1/2 " wide standoff and I had some laying
> around and used that instead. I also made the diameter of the plates 9 3/4"
> because I plan to add a blow out shroud to the plates to protect the bag
> and the air fill line. The mounting plate and the standoff are 1/4". I used
> grade 5, 3/4" by 2" coarse bolts to hold the standoff to the bogie with
> integrated locking type flange head on the nut. Ran out of time last week
> due to turkey day and came in this morning to see how the Markbag(tm)
> compared. Here is how the Markbag(tm) compared to the oem as I left one
> tired oem bag on the right side and put the markbag on the left. For the
> purpose of consistency I put the no
> n test side at a height of about 15 1/2". All of my height measurements
> were made from the center bottom of a straight edge(in my case a bamboo
> paint stir stick) resting across the bogie grease fittings.
> >
> > ORIGINAL BAG
> > Max height 17"
> > Min height 9"
> > Pressure at max height 105psi
> > deflation time 2 minutes and 11 seconds from full up to bottom out.
> > Full inflate from full deflate 10 minutes and 29 seconds.
> >
> > MARKBAG
> > Max height 16 3/4" to 16 7/8"(floor on this side has small damage where
> measuring)
> > Min height 9 1/2"
> > Pressure at max height 88 psi
> > Deflation time 3 minutes and 6 seconds
> > Full attainable lift height from empty in 5 minutes and 40 seconds
> >
> > Some observations
> > 1. with both bags deflated the frame is almost touching the concrete
> maybe an inch away from the collapsed rear frame gliders
> > 2. the braided rear brake lines added by the p.o. bind when bogies pivot
> up at full down. The hold downs need to allow the lines to slide
> horizontally or have an exaggerated loop near junction block to avoid
> pinching of the line.
> > 3. The Markbag only took a minute and 32 seconds to go from full deflate
> to 16" and another 4 minutes to get the last 3/4"
> > 4. The Markbag reached full height in 5 minutes and 40 seconds but ran
> it to 88 psi from around 60 just to see if I could get a little more. From
> empty to 88 psi took 6 minutes and 45 seconds
> > 5. The oem bag moved through its upward lift much slower in its mid
> travel than the Markbag and really slowed durring the last 3/4" to inch of
> lift.
> > 6. Cuting the plates round and centering the mounting holes was a bit
> challenging. I used the cone portion of the Markbag as a template for the
> diameter cut line and the center hole location. When aligning the standoffs
> I used a 1/2"bolt passed up from the bottom side of the plate and centered
> it through the 3/4" standoff mount hole,spun a nut down on it to hold it in
> alignment and marked the plate where the corners of the standoff touched
> with a sharpie. You cannot do this once the 3/4" bolt is welded in and you
> cannot get the 3/4" bolt into the standoff when it is on the plate. If a
> nut was welded into the standoff instead of a bolt then it could be aligned
> at the end but this could make bag instal a little more cumbersome.
> > 7. Cant give you a ride comparison as my coach is currently not
> roadworthy and I have driven it very little since purchase as it is
> undergoing a bit of a restoration.
> > 8. I did not do a timed lift to travel mode as I do not have a way to
> tell when one bag stops filling
> > 9. The interior/rear body cap and glass/side windows and air
> conditioners/water tank/refridgerator and all cabinetry are removed from my
> coach but the 6kw onan is in place. Both of my fuel tanks are full.
> > 10. Have a lot of play in left front bogie arm. Left rear seems okay.
> Kinda afraid to check right side
> >
> > Out to tac the other side together so I can tig weld the final beads at
> home shop. Body is all painted except the very front portion which ill do
> when windshields are out once shes back at home shop. Got to get her home
> to finish the inside and instal the Howell efi as it turns out I have 3
> Quadra Jet carbs none of which are the motor home application.
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
Dennis S
73 Painted Desert 230
Memphis TN Metro
|
|
|
|
|
|
| Re: The Markbag(tm) [message #150805 is a reply to message #150701] |
Sun, 27 November 2011 19:44 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
This looks like a good idea to me. Is this a stock truck bag which should be available at most truck stops? Looks by eye like it has 'good cush factor' or travel if you will.
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154496 is a reply to message #150701] |
Tue, 27 December 2011 12:35 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
|
Senior Member |
|
|
I have purchased the air bags and have fabricated the endplates for this
Marksbag. My coach is in storage so I can't confirm what the mounting
fastener is for the bag to the bogie, are they 3/4" or 1/2". I will be
going over to my brothers this afternoon to get everything welded up.
Thanks,
On Sat, Nov 26, 2011 at 2:28 PM, sgltrac <sgltrac@gmail.com> wrote:
>
>
> Late last week I finally found time to copy the mounting plate drawings
> that Mark G supplied for his Firestone bag discovery. I obtained two bags
> #FI 9294 a few weeks ago and dove in on the mounting plates as described by
> Mark. I did make one alteration however to the standoff. The mounting
> flange of the bogie will fit a 2 1/2 " wide standoff and I had some laying
> around and used that instead. I also made the diameter of the plates 9 3/4"
> because I plan to add a blow out shroud to the plates to protect the bag
> and the air fill line. The mounting plate and the standoff are 1/4". I used
> grade 5, 3/4" by 2" coarse bolts to hold the standoff to the bogie with
> integrated locking type flange head on the nut. Ran out of time last week
> due to turkey day and came in this morning to see how the Markbag(tm)
> compared. Here is how the Markbag(tm) compared to the oem as I left one
> tired oem bag on the right side and put the markbag on the left. For the
> purpose of consistency I put the non
> test side at a height of about 15 1/2". All of my height measurements
> were made from the center bottom of a straight edge(in my case a bamboo
> paint stir stick) resting across the bogie grease fittings.
>
> ORIGINAL BAG
> Max height 17"
> Min height 9"
> Pressure at max height 105psi
> deflation time 2 minutes and 11 seconds from full up to bottom out.
> Full inflate from full deflate 10 minutes and 29 seconds.
>
> MARKBAG
> Max height 16 3/4" to 16 7/8"(floor on this side has small damage where
> measuring)
> Min height 9 1/2"
> Pressure at max height 88 psi
> Deflation time 3 minutes and 6 seconds
> Full attainable lift height from empty in 5 minutes and 40 seconds
>
> Some observations
> 1. with both bags deflated the frame is almost touching the concrete maybe
> an inch away from the collapsed rear frame gliders
> 2. the braided rear brake lines added by the p.o. bind when bogies pivot
> up at full down. The hold downs need to allow the lines to slide
> horizontally or have an exaggerated loop near junction block to avoid
> pinching of the line.
> 3. The Markbag only took a minute and 32 seconds to go from full deflate
> to 16" and another 4 minutes to get the last 3/4"
> 4. The Markbag reached full height in 5 minutes and 40 seconds but ran it
> to 88 psi from around 60 just to see if I could get a little more. From
> empty to 88 psi took 6 minutes and 45 seconds
> 5. The oem bag moved through its upward lift much slower in its mid travel
> than the Markbag and really slowed durring the last 3/4" to inch of lift.
> 6. Cuting the plates round and centering the mounting holes was a bit
> challenging. I used the cone portion of the Markbag as a template for the
> diameter cut line and the center hole location. When aligning the standoffs
> I used a 1/2"bolt passed up from the bottom side of the plate and centered
> it through the 3/4" standoff mount hole,spun a nut down on it to hold it in
> alignment and marked the plate where the corners of the standoff touched
> with a sharpie. You cannot do this once the 3/4" bolt is welded in and you
> cannot get the 3/4" bolt into the standoff when it is on the plate. If a
> nut was welded into the standoff instead of a bolt then it could be aligned
> at the end but this could make bag instal a little more cumbersome.
> 7. Cant give you a ride comparison as my coach is currently not roadworthy
> and I have driven it very little since purchase as it is undergoing a bit
> of a restoration.
> 8. I did not do a timed lift to travel mode as I do not have a way to tell
> when one bag stops filling
> 9. The interior/rear body cap and glass/side windows and air
> conditioners/water tank/refridgerator and all cabinetry are removed from my
> coach but the 6kw onan is in place. Both of my fuel tanks are full.
> 10. Have a lot of play in left front bogie arm. Left rear seems okay.
> Kinda afraid to check right side :lol:
>
> Out to tac the other side together so I can tig weld the final beads at
> home shop. Body is all painted except the very front portion which ill do
> when windshields are out once shes back at home shop. Got to get her home
> to finish the inside and instal the Howell efi as it turns out I have 3
> Quadra Jet carbs none of which are the motor home application.
>
>
>
> --
> Sully
> 77 Royale basket case.
> Future motorhome land speed record holder(bucket list)
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
GMC Wannabe
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
|
|
|
|
|
|
| Re: The Markbag(tm) [message #154507 is a reply to message #150701] |
Tue, 27 December 2011 14:05 |
glacierfl
Messages: 444
Registered: June 2011
Karma: 0
|
Senior Member |
|
|
Hello,
I have been watching this project progress. Wanting like many others a cheaper bag system that compares with the OEM version.
I do have a question about this system however. From the photographs, it seems that the distance between the plates on the bags, and the tires, seems a lot less than the OEM system.
I would worry about the suspension dropping and ripping chunks out of the tires, as the plates look a lot wider, than the alum ends on the OEM bags. I have not seen this system in the flesh, so perhaps its only the angle of the photographs that makes me think there could be a potential problem.
cheers and beers
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
|
|
|
|
| Re: The Markbag(tm) [message #154523 is a reply to message #154507] |
Tue, 27 December 2011 15:24 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| glacierfl wrote on Tue, 27 December 2011 12:05 |
... From the photographs, it seems that the distance between the plates on the bags, and the tires, seems a lot less than the OEM system.
I would worry about the suspension dropping and ripping chunks out of the tires, as the plates look a lot wider, than the alum ends on the OEM bags. ...
|
The plates/bags are attached to the boogie arms as are the wheels and tires. So they move together. The distance between them should not change regardless of the height of the suspension.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154615 is a reply to message #154496] |
Tue, 27 December 2011 22:31 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
3/4 inch
Sully
77 royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Bruce Hart <hartsgmc@gmail.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Tue, 27 Dec 2011 11:35:01
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] The Markbag(tm)
I have purchased the air bags and have fabricated the endplates for this
Marksbag. My coach is in storage so I can't confirm what the mounting
fastener is for the bag to the bogie, are they 3/4" or 1/2". I will be
going over to my brothers this afternoon to get everything welded up.
Thanks,
On Sat, Nov 26, 2011 at 2:28 PM, sgltrac <sgltrac@gmail.com> wrote:
>
>
> Late last week I finally found time to copy the mounting plate drawings
> that Mark G supplied for his Firestone bag discovery. I obtained two bags
> #FI 9294 a few weeks ago and dove in on the mounting plates as described by
> Mark. I did make one alteration however to the standoff. The mounting
> flange of the bogie will fit a 2 1/2 " wide standoff and I had some laying
> around and used that instead. I also made the diameter of the plates 9 3/4"
> because I plan to add a blow out shroud to the plates to protect the bag
> and the air fill line. The mounting plate and the standoff are 1/4". I used
> grade 5, 3/4" by 2" coarse bolts to hold the standoff to the bogie with
> integrated locking type flange head on the nut. Ran out of time last week
> due to turkey day and came in this morning to see how the Markbag(tm)
> compared. Here is how the Markbag(tm) compared to the oem as I left one
> tired oem bag on the right side and put the markbag on the left. For the
> purpose of consistency I put the non
> test side at a height of about 15 1/2". All of my height measurements
> were made from the center bottom of a straight edge(in my case a bamboo
> paint stir stick) resting across the bogie grease fittings.
>
> ORIGINAL BAG
> Max height 17"
> Min height 9"
> Pressure at max height 105psi
> deflation time 2 minutes and 11 seconds from full up to bottom out.
> Full inflate from full deflate 10 minutes and 29 seconds.
>
> MARKBAG
> Max height 16 3/4" to 16 7/8"(floor on this side has small damage where
> measuring)
> Min height 9 1/2"
> Pressure at max height 88 psi
> Deflation time 3 minutes and 6 seconds
> Full attainable lift height from empty in 5 minutes and 40 seconds
>
> Some observations
> 1. with both bags deflated the frame is almost touching the concrete maybe
> an inch away from the collapsed rear frame gliders
> 2. the braided rear brake lines added by the p.o. bind when bogies pivot
> up at full down. The hold downs need to allow the lines to slide
> horizontally or have an exaggerated loop near junction block to avoid
> pinching of the line.
> 3. The Markbag only took a minute and 32 seconds to go from full deflate
> to 16" and another 4 minutes to get the last 3/4"
> 4. The Markbag reached full height in 5 minutes and 40 seconds but ran it
> to 88 psi from around 60 just to see if I could get a little more. From
> empty to 88 psi took 6 minutes and 45 seconds
> 5. The oem bag moved through its upward lift much slower in its mid travel
> than the Markbag and really slowed durring the last 3/4" to inch of lift.
> 6. Cuting the plates round and centering the mounting holes was a bit
> challenging. I used the cone portion of the Markbag as a template for the
> diameter cut line and the center hole location. When aligning the standoffs
> I used a 1/2"bolt passed up from the bottom side of the plate and centered
> it through the 3/4" standoff mount hole,spun a nut down on it to hold it in
> alignment and marked the plate where the corners of the standoff touched
> with a sharpie. You cannot do this once the 3/4" bolt is welded in and you
> cannot get the 3/4" bolt into the standoff when it is on the plate. If a
> nut was welded into the standoff instead of a bolt then it could be aligned
> at the end but this could make bag instal a little more cumbersome.
> 7. Cant give you a ride comparison as my coach is currently not roadworthy
> and I have driven it very little since purchase as it is undergoing a bit
> of a restoration.
> 8. I did not do a timed lift to travel mode as I do not have a way to tell
> when one bag stops filling
> 9. The interior/rear body cap and glass/side windows and air
> conditioners/water tank/refridgerator and all cabinetry are removed from my
> coach but the 6kw onan is in place. Both of my fuel tanks are full.
> 10. Have a lot of play in left front bogie arm. Left rear seems okay.
> Kinda afraid to check right side :lol:
>
> Out to tac the other side together so I can tig weld the final beads at
> home shop. Body is all painted except the very front portion which ill do
> when windshields are out once shes back at home shop. Got to get her home
> to finish the inside and instal the Howell efi as it turns out I have 3
> Quadra Jet carbs none of which are the motor home application.
>
>
>
> --
> Sully
> 77 Royale basket case.
> Future motorhome land speed record holder(bucket list)
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
GMC Wannabe
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154620 is a reply to message #154615] |
Wed, 28 December 2011 02:57 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
To the people who sent me off net notes on making the brackets for these:
I'm going to have to delay any work on this project for a while. The fellow who will make these showed me the circle cutter the other day and demonstrated how it works while he was making some aircraft engine stands.
The problem I have now is he is going in for Knee replacement surgery Jan 7th and after the first one is done and he has been through rehab they will do the second one. He told me he does not think he would be able to make these until April. Since we already have one person making these, I suggest you contact him if you need these.
At the time I offered to have these fabricated I did not realize that someone else was also doing it. It also makes sense to contact him and not have a second source for such a limited amount that need to be manufactured.
We will re-assess this in April.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154640 is a reply to message #154620] |
Wed, 28 December 2011 09:46 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
And the info for "he" and "him" is as follows;
www.bdub.net/sully
Sully
77 Royale
On Wed, Dec 28, 2011 at 12:57 AM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> To the people who sent me off net notes on making the brackets for these:
>
> I'm going to have to delay any work on this project for a while. The
> fellow who will make these showed me the circle cutter the other day and
> demonstrated how it works while he was making some aircraft engine stands.
>
> The problem I have now is he is going in for Knee replacement surgery Jan
> 7th and after the first one is done and he has been through rehab they will
> do the second one. He told me he does not think he would be able to make
> these until April. Since we already have one person making these, I
> suggest you contact him if you need these.
>
> At the time I offered to have these fabricated I did not realize that
> someone else was also doing it. It also makes sense to contact him and not
> have a second source for such a limited amount that need to be manufactured.
>
> We will re-assess this in April.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154642 is a reply to message #154640] |
Wed, 28 December 2011 11:11 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
|
Senior Member |
|
|
Thanks for the write up.
On Wed, Dec 28, 2011 at 8:46 AM, Todd Sullivan <sgltrac@gmail.com> wrote:
> And the info for "he" and "him" is as follows;
>
> www.bdub.net/sully
>
>
> Sully
> 77 Royale
>
> On Wed, Dec 28, 2011 at 12:57 AM, Ken Burton <n9cv@comcast.net> wrote:
>
> >
> >
> > To the people who sent me off net notes on making the brackets for these:
> >
> > I'm going to have to delay any work on this project for a while. The
> > fellow who will make these showed me the circle cutter the other day and
> > demonstrated how it works while he was making some aircraft engine
> stands.
> >
> > The problem I have now is he is going in for Knee replacement surgery Jan
> > 7th and after the first one is done and he has been through rehab they
> will
> > do the second one. He told me he does not think he would be able to make
> > these until April. Since we already have one person making these, I
> > suggest you contact him if you need these.
> >
> > At the time I offered to have these fabricated I did not realize that
> > someone else was also doing it. It also makes sense to contact him and
> not
> > have a second source for such a limited amount that need to be
> manufactured.
> >
> > We will re-assess this in April.
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
GMC Wannabe
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154643 is a reply to message #154642] |
Wed, 28 December 2011 11:35 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
You are welcome Bruce.
Sully
77 Royale
On Wed, Dec 28, 2011 at 9:11 AM, Bruce Hart <hartsgmc@gmail.com> wrote:
> Thanks for the write up.
>
> On Wed, Dec 28, 2011 at 8:46 AM, Todd Sullivan <sgltrac@gmail.com> wrote:
>
> > And the info for "he" and "him" is as follows;
> >
> > www.bdub.net/sully
> >
> >
> > Sully
> > 77 Royale
> >
> > On Wed, Dec 28, 2011 at 12:57 AM, Ken Burton <n9cv@comcast.net> wrote:
> >
> > >
> > >
> > > To the people who sent me off net notes on making the brackets for
> these:
> > >
> > > I'm going to have to delay any work on this project for a while. The
> > > fellow who will make these showed me the circle cutter the other day
> and
> > > demonstrated how it works while he was making some aircraft engine
> > stands.
> > >
> > > The problem I have now is he is going in for Knee replacement surgery
> Jan
> > > 7th and after the first one is done and he has been through rehab they
> > will
> > > do the second one. He told me he does not think he would be able to
> make
> > > these until April. Since we already have one person making these, I
> > > suggest you contact him if you need these.
> > >
> > > At the time I offered to have these fabricated I did not realize that
> > > someone else was also doing it. It also makes sense to contact him and
> > not
> > > have a second source for such a limited amount that need to be
> > manufactured.
> > >
> > > We will re-assess this in April.
> > > --
> > > Ken Burton - N9KB
> > > 76 Palm Beach
> > > Hebron, Indiana
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Bruce Hart
> GMC Wannabe
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
| Re: [GMCnet] The Markbag(tm) [message #154652 is a reply to message #154640] |
Wed, 28 December 2011 12:44 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| sgltrac wrote on Wed, 28 December 2011 09:46 |
And the info for "he" and "him" is as follows;
www.bdub.net/sully
Sully
77 Royale
|
Sorry Sully. I should have mentioned your name in the posting. I wasn't thinking at the time.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
|
|
| Re: The Markbag(tm) [message #155689 is a reply to message #150701] |
Fri, 06 January 2012 09:23 |
Wander Inn
Messages: 100
Registered: January 2010
Location: Phoenix Az.
Karma: 0
|
Senior Member |
|
|
I cannot find the Firestone #9294 air bags at a local
vender. Firestone factory has a back order date of the
middle of Feburay.
Mike
Mike & Chris Hughes
1977 Kingsley
Phoenix, Az.
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
