Home » Public Forums » GMCnet » The pause that makes you heart skip
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| Re: [GMCnet] The pause that makes you heart skip [message #70939 is a reply to message #70921] |
Sat, 16 January 2010 07:04   |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Hey Rob,
Isn't a crash sort of a permanent stop?
On Fri, Jan 15, 2010 at 8:28 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Bob,
>
> At first glance I thought the installation looked very good.
>
> I then thought about it and said to myself; "Hey, wait a minute; that's
> doesn't seem to be a good place to put the tank, it's just behind the front
> bumper! If Bob crashes into anything it will break and he'll loose the
> vacuum and brakes."
>
> I thought about it for a few more seconds and realized that loosing the
> vacuum and brakes AFTER you crashed into something wouldn't matter! DUH!
>
> Thought you would get a laugh out of this!
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Bob de Kruyff
> Sent: Saturday, 16 January 2010 1:29 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] The pause that makes you heart skip
>
> ""For a while, some years back, I made vacuum tanks like you describe to
> sell
> at rallies.""
>
> Here's a link to my installation:
>
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=3384
>
> It gives me at least 6 pumps even when sitting for months. However when we
> first started discussing these, we found that many boosters "consumed"
> vacuum not only while depressing the pedal, but also while holding the pedal
> down. There were some indications that the sensitized boosters were
> especially suspect. A good booster should only use vacuum during pedal
> depression--not when static whether up or down.
>
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
> _______________________________________________
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] The pause that makes you heart skip [message #70942 is a reply to message #70930] |
Sat, 16 January 2010 08:42 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| GMCWiperMan wrote on Sat, 16 January 2010 00:31 |
By the way, how the heck can vacuum push gasoline to the booster?
Ken H.
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Ken,
As a friend used to say, "It is the perverse nature of inanimate objects."
But to actually answer your question:
A conventional carburetor does not actually vaporize fuel very well at all and in actual fact it spills a mixture of liquid fuel and air into the intake manifold. (We often referred to the device our coaches have as a solid fuel carburetor in the lab to differentiate it from a gaseous fuel (like LPG) device.)
The intake depression (vacuum) that is used to motivate so many things is temporary at best. Its coming and going invites an unexpected (to some) number of issues.
We expected (and on several occasions verified) that the liquid fuel would impact and stick to the interior surface of the intake runners. That liquid fuel will then be right there at the manifold taps and waiting for any system pressure reversal. A cold engine stall is a guaranteed "gotcha". When the vacuum goes away (Map=30hg) the pressure in all those connected things is now lower than manifold. All check valves can be counted on to leak to some extent at some time. If it happens at the right time, there is wet fuel waiting to be sucked in. Even if the check valve does not actually leak, the described pressure reversals will cause the connecting tubing to become filled with wet fuel. We found wet fuel in the HVAC operators and transmission modulators. I have seen brake boosters full to the check valve, but that is not common.
A variety of popular Japanese car that was not fitted with power brakes in the home market had a very bad case of this. The vacuum tube routing would cause the booster fill with fuel that would dump into the manifold when the brakes were released. Since it also had an automatic transmission that was not used in the home market, the engine would stall. As a contract house, we cured the "fire goes out when you try to go" by rerouting the brake booster's vacuum line and including a loop of steel line to trap fuel until underhood temps could encourage it to go back into the manifold.
Fun stuff - Huh?
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] The pause that makes you heart skip [message #70945 is a reply to message #70942] |
Sat, 16 January 2010 09:44 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Very informative post Matt. Like I said before, I sure wish you could
do a complete data dump all at once so we could just archive it when
we need it.
On Sat, Jan 16, 2010 at 7:42 AM, Matt Colie <mcolie@chartermi.net> wrote:
>
>
> GMCWiperMan wrote on Sat, 16 January 2010 00:31
>> By the way, how the heck can vacuum push gasoline to the booster?
>>
>> Ken H.
>
> Ken,
>
> As a friend used to say, "It is the perverse nature of inanimate objects."
>
> But to actually answer your question:
> A conventional carburetor does not actually vaporize fuel very well at all and in actual fact it spills a mixture of liquid fuel and air into the intake manifold. (We often referred to the device our coaches have as a solid fuel carburetor in the lab to differentiate it from a gaseous fuel (like LPG) device.)
>
> The intake depression (vacuum) that is used to motivate so many things is temporary at best. Its coming and going invites an unexpected (to some) number of issues.
>
> We expected (and on several occasions verified) that the liquid fuel would impact and stick to the interior surface of the intake runners. That liquid fuel will then be right there at the manifold taps and waiting for any system pressure reversal. A cold engine stall is a guaranteed "gotcha". When the vacuum goes away (Map=30hg) the pressure in all those connected things is now lower than manifold. All check valves can be counted on to leak to some extent at some time. If it happens at the right time, there is wet fuel waiting to be sucked in. Even if the check valve does not actually leak, the described pressure reversals will cause the connecting tubing to become filled with wet fuel. We found wet fuel in the HVAC operators and transmission modulators. I have seen brake boosters full to the check valve, but that is not common.
>
> A variety of popular Japanese car that was not fitted with power brakes in the home market had a very bad case of this. The vacuum tube routing would cause the booster fill with fuel that would dump into the manifold when the brakes were released. Since it also had an automatic transmission that was not used in the home market, the engine would stall. As a contract house, we cured the "fire goes out when you try to go" by rerouting the brake booster's vacuum line and including a loop of steel line to trap fuel until underhood temps could encourage it to go back into the manifold.
>
> Fun stuff - Huh?
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] The pause that makes you heart skip [message #70950 is a reply to message #70921] |
Sat, 16 January 2010 10:52 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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You are probably right, most of the time.
Imagine hitting something relatively light... a corner of a small car or (God forbid) a motorcycle... Enough to cause damage but not enough to burn off the momentum of 12,000lbs of hot-rod. You could still be moving but without brakes.
I would AT LEAST provide some kind of check valve.
| Robert Mueller wrote on Fri, 15 January 2010 19:28 |
... I then thought about it and said to myself; "Hey, wait a minute; that's doesn't seem to be a good place to put the tank, it's just behind the front bumper! If Bob crashes into anything it will break and he'll loose the vacuum and brakes."
I thought about it for a few more seconds and realized that loosing the vacuum and brakes AFTER you crashed into something wouldn't matter! DUH! ...
|
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
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| Re: [GMCnet] The pause that makes you heart skip [message #70965 is a reply to message #70950] |
Sat, 16 January 2010 13:38 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mike,
Good point!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Mike Miller
Sent: Sunday, 17 January 2010 3:53 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] The pause that makes you heart skip
You are probably right, most of the time.
Imagine hitting something relatively light... a corner of a small car or
(God forbid) a motorcycle... Enough to cause damage but not enough to burn
off the momentum of 12,000lbs of hot-rod. You could still be moving but
without brakes.
I would AT LEAST provide some kind of check valve.
--
Mike Miller
`73 26' X Painted D.
`78 23' Birchaven
Hillsboro, OR
_______________________________________________
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] The pause that makes you heart skip [message #70987 is a reply to message #70977] |
Sat, 16 January 2010 17:01 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
I found pictures of your vacuum reservoir on the photo site and I've got a
few questions.
The Photo Details state:
4\" x 34\" PVC w/2 caps. Fitting at right end is check valve identical to
that at brake booster. Top lines are for Brake Booster, Vacuum Pump, and A/C
Reservoir.
1) The lines going out the top appear to be inserted directly into the PVC
pipe, how are they retained / sealed?
2) The check valve on the right side is plumbed to intake manifold vacuum?
3) The A/C reservoir is the little plastic container attached to the drivers
side of the air conditioning plenum box?
4) Could you draw up a flow schematic of your system and post it to the
photo site?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Sunday, 17 January 2010 9:29 AM
To: gmclist
Subject: Re: [GMCnet] The pause that makes you heart skip
That's an argument in favor of my not-so-clever two check valve plumbing:
Even if the reservoir is destroyed, the booster's still got its charge.
Ken H.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] The pause that makes you heart skip [message #70989 is a reply to message #70987] |
Sat, 16 January 2010 17:16 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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Rob,
Glad you found the right dimensions. :-) I just remembered "about 30"".
1. I didn't look at the photo; I may at one time have just used PEX or
polycarbonate tubes tightly fitted and sealed with Plumber's Goop. Later I
changed to 1/4" MPT X Hose Barb for the booster and vacuum pump, with 1/4"
nylon DOT for the A/C reservoir. Vacuum's not very hard to seal -- 14.7
psi's not very much. :-)
I didn't mention those extra connections in order to keep things simple. My
vacuum pump is not the regular in-line unit but a Cad suspension pump
modified for vacuum. It's not even wired for automatic operation.
2. Yes the check valve on the end connects to the intake manifold.
3. Yep, the little black softball on the driver's side of the HVAC box is
the A/C reservoir. I don't know that backing it up as I did is worth the
trouble of drilling the hole or the cost of the hose to connect it. I've
never had any problem with HVAC selection caused by insufficient vacuum. I
just backed it up "'cause I could".
4. Are you kidding me? :-) Yeah, I'll see if I can figure out how to draw
it. Do I have to include ALL the HVAC control diaphragms?
Ken H.
On Sat, Jan 16, 2010 at 6:01 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Ken,
>
> I found pictures of your vacuum reservoir on the photo site and I've got a
> few questions.
>
> The Photo Details state:
>
> 4\" x 34\" PVC w/2 caps. Fitting at right end is check valve identical to
> that at brake booster. Top lines are for Brake Booster, Vacuum Pump, and
> A/C
> Reservoir.
>
> 1) The lines going out the top appear to be inserted directly into the PVC
> pipe, how are they retained / sealed?
>
> 2) The check valve on the right side is plumbed to intake manifold vacuum?
>
> 3) The A/C reservoir is the little plastic container attached to the
> drivers
> side of the air conditioning plenum box?
>
> 4) Could you draw up a flow schematic of your system and post it to the
> photo site?
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
> Sent: Sunday, 17 January 2010 9:29 AM
> To: gmclist
> Subject: Re: [GMCnet] The pause that makes you heart skip
>
> That's an argument in favor of my not-so-clever two check valve plumbing:
> Even if the reservoir is destroyed, the booster's still got its charge.
>
> Ken H.
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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List Information and Subscription Options:
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| Re: [GMCnet] The pause that makes you heart skip [message #71000 is a reply to message #70989] |
Sat, 16 January 2010 21:28 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
No you don't need to draw the whole mess, just show the tank, the lines out
of it; where the check valves are; and what direction they allow "vacuum to
flow."
Actually I guess you could just confirm that:
1) The check valve in the end of the tank allows "vacuum to flow" out of the
tank into the intake manifold.
2) The check valve between the tank and the booster allows "vacuum to flow"
from the tank into the booster. This is already in the booster.
3) The check valve between the vacuum pump and the tank allows "vacuum to
flow" from the tank into the pump.
Did I get guess this right?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Sunday, 17 January 2010 10:17 AM
To: gmclist
Subject: Re: [GMCnet] The pause that makes you heart skip
Rob,
Glad you found the right dimensions. :-) I just remembered "about 30"".
1. I didn't look at the photo; I may at one time have just used PEX or
polycarbonate tubes tightly fitted and sealed with Plumber's Goop. Later I
changed to 1/4" MPT X Hose Barb for the booster and vacuum pump, with 1/4"
nylon DOT for the A/C reservoir. Vacuum's not very hard to seal -- 14.7
psi's not very much. :-)
I didn't mention those extra connections in order to keep things simple. My
vacuum pump is not the regular in-line unit but a Cad suspension pump
modified for vacuum. It's not even wired for automatic operation.
2. Yes the check valve on the end connects to the intake manifold.
3. Yep, the little black softball on the driver's side of the HVAC box is
the A/C reservoir. I don't know that backing it up as I did is worth the
trouble of drilling the hole or the cost of the hose to connect it. I've
never had any problem with HVAC selection caused by insufficient vacuum. I
just backed it up "'cause I could".
4. Are you kidding me? :-) Yeah, I'll see if I can figure out how to draw
it. Do I have to include ALL the HVAC control diaphragms?
Ken H.
On Sat, Jan 16, 2010 at 6:01 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Ken,
>
> I found pictures of your vacuum reservoir on the photo site and I've got a
> few questions.
>
> The Photo Details state:
>
> 4\" x 34\" PVC w/2 caps. Fitting at right end is check valve identical to
> that at brake booster. Top lines are for Brake Booster, Vacuum Pump, and
> A/C
> Reservoir.
>
> 1) The lines going out the top appear to be inserted directly into the PVC
> pipe, how are they retained / sealed?
>
> 2) The check valve on the right side is plumbed to intake manifold vacuum?
>
> 3) The A/C reservoir is the little plastic container attached to the
> drivers
> side of the air conditioning plenum box?
>
> 4) Could you draw up a flow schematic of your system and post it to the
> photo site?
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
> Sent: Sunday, 17 January 2010 9:29 AM
> To: gmclist
> Subject: Re: [GMCnet] The pause that makes you heart skip
>
> That's an argument in favor of my not-so-clever two check valve plumbing:
> Even if the reservoir is destroyed, the booster's still got its charge.
>
> Ken H.
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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_______________________________________________
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] The pause that makes you heart skip [message #71003 is a reply to message #70989] |
Sat, 16 January 2010 20:58 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Ken,
Have you looked at the pictures you put on Photosite?
Gary Kosier
----- Original Message -----
From: "Ken Henderson" <ken0henderson@gmail.com>
To: "gmclist" <gmclist@temp.gmcnet.org>
Sent: Saturday, January 16, 2010 6:16 PM
Subject: Re: [GMCnet] The pause that makes you heart skip
> Rob,
>
> Glad you found the right dimensions. :-) I just remembered
> "about 30"".
>
> 1. I didn't look at the photo; I may at one time have just
> used PEX or
> polycarbonate tubes tightly fitted and sealed with Plumber's
> Goop. Later I
> changed to 1/4" MPT X Hose Barb for the booster and vacuum
> pump, with 1/4"
> nylon DOT for the A/C reservoir. Vacuum's not very hard to
> seal -- 14.7
> psi's not very much. :-)
>
> I didn't mention those extra connections in order to keep
> things simple. My
> vacuum pump is not the regular in-line unit but a Cad
> suspension pump
> modified for vacuum. It's not even wired for automatic
> operation.
>
> 2. Yes the check valve on the end connects to the intake
> manifold.
>
> 3. Yep, the little black softball on the driver's side of the
> HVAC box is
> the A/C reservoir. I don't know that backing it up as I did is
> worth the
> trouble of drilling the hole or the cost of the hose to connect
> it. I've
> never had any problem with HVAC selection caused by
> insufficient vacuum. I
> just backed it up "'cause I could".
>
> 4. Are you kidding me? :-) Yeah, I'll see if I can figure
> out how to draw
> it. Do I have to include ALL the HVAC control diaphragms?
>
>
> Ken H.
>
>
> On Sat, Jan 16, 2010 at 6:01 PM, Rob Mueller
> <robmueller@iinet.net.au>wrote:
>
>> Ken,
>>
>> I found pictures of your vacuum reservoir on the photo site
>> and I've got a
>> few questions.
>>
>> The Photo Details state:
>>
>> 4\" x 34\" PVC w/2 caps. Fitting at right end is check valve
>> identical to
>> that at brake booster. Top lines are for Brake Booster, Vacuum
>> Pump, and
>> A/C
>> Reservoir.
>>
>> 1) The lines going out the top appear to be inserted directly
>> into the PVC
>> pipe, how are they retained / sealed?
>>
>> 2) The check valve on the right side is plumbed to intake
>> manifold vacuum?
>>
>> 3) The A/C reservoir is the little plastic container attached
>> to the
>> drivers
>> side of the air conditioning plenum box?
>>
>> 4) Could you draw up a flow schematic of your system and post
>> it to the
>> photo site?
>>
>> Regards,
>> Rob Mueller
>> Sydney, Australia
>> AUS '75 Avion-The Blue Streak TZE365V100428
>> USA '75 Avion-Double Trouble TZE365V100426
>>
>>
>> -----Original Message-----
>> From: gmclist-bounces@temp.gmcnet.org
>> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken
>> Henderson
>> Sent: Sunday, 17 January 2010 9:29 AM
>> To: gmclist
>> Subject: Re: [GMCnet] The pause that makes you heart skip
>>
>> That's an argument in favor of my not-so-clever two check
>> valve plumbing:
>> Even if the reservoir is destroyed, the booster's still got
>> its charge.
>>
>> Ken H.
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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List Information and Subscription Options:
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| Re: [GMCnet] The pause that makes you heart skip [message #71009 is a reply to message #71000] |
Sun, 17 January 2010 07:35 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
|
Senior Member |
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Weelll, yea, you've got it right, but I think of it a little differently:
1. The running engine sucks air out of the reservoir through the check
valve in its end, which keeps the air out.
2. When turned ON, the boost pump also sucks air out of the reservoir
through another check valve.
(Gary's prompt to look at the photos reminded me that's a weird check valve:
2-way of which I use only one.)
3. Vacuum in the reservoir sucks air out of the booster through its OEM
check valve, and straight out of the tiny HVAC softball.
Ken H.
On Sat, Jan 16, 2010 at 10:28 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Ken,
>
> No you don't need to draw the whole mess, just show the tank, the lines out
> of it; where the check valves are; and what direction they allow "vacuum to
> flow."
>
> Actually I guess you could just confirm that:
>
> 1) The check valve in the end of the tank allows "vacuum to flow" out of
> the
> tank into the intake manifold.
>
> 2) The check valve between the tank and the booster allows "vacuum to flow"
> from the tank into the booster. This is already in the booster.
>
> 3) The check valve between the vacuum pump and the tank allows "vacuum to
> flow" from the tank into the pump.
>
> Did I get guess this right?
>
>
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| Re: [GMCnet] The pause that makes you heart skip [message #71011 is a reply to message #71009] |
Sun, 17 January 2010 07:38 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
Thanks!
I understood what I meant and you understood what I meant but your way of
explaining it is way more betterer than mine! ;-)
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, 18 January 2010 12:35 AM
To: gmclist
Subject: Re: [GMCnet] The pause that makes you heart skip
Weelll, yea, you've got it right, but I think of it a little differently:
1. The running engine sucks air out of the reservoir through the check
valve in its end, which keeps the air out.
2. When turned ON, the boost pump also sucks air out of the reservoir
through another check valve.
(Gary's prompt to look at the photos reminded me that's a weird check valve:
2-way of which I use only one.)
3. Vacuum in the reservoir sucks air out of the booster through its OEM
check valve, and straight out of the tiny HVAC softball.
Ken H.
On Sat, Jan 16, 2010 at 10:28 PM, Rob Mueller
<robmueller@iinet.net.au>wrote:
> Ken,
>
> No you don't need to draw the whole mess, just show the tank, the lines
out
> of it; where the check valves are; and what direction they allow "vacuum
to
> flow."
>
> Actually I guess you could just confirm that:
>
> 1) The check valve in the end of the tank allows "vacuum to flow" out of
> the
> tank into the intake manifold.
>
> 2) The check valve between the tank and the booster allows "vacuum to
flow"
> from the tank into the booster. This is already in the booster.
>
> 3) The check valve between the vacuum pump and the tank allows "vacuum to
> flow" from the tank into the pump.
>
> Did I get guess this right?
>
>
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] The pause that makes you heart skip [message #71012 is a reply to message #71010] |
Sun, 17 January 2010 07:40 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
I did a search for "reservoir" and they popped up!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, 18 January 2010 12:38 AM
To: gmclist
Subject: Re: [GMCnet] The pause that makes you heart skip
Not for YEARS! I almost gave up trying to find them. How the heck did
y'all find them buried in there?
I'd completely forgotten about that odd-ball 2-way check valve I used 'cause
I had it. It may still be there.
Thanks for prompting me to look. I REALLY need to clean up my albums --
eliminate about half of them & update the rest.
Ken H.
On Sat, Jan 16, 2010 at 9:58 PM, Kosier <gkosier@roadrunner.com> wrote:
> Ken,
>
> Have you looked at the pictures you put on Photosite?
>
> Gary Kosier
>
>
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] The pause that makes you heart skip [message #71013 is a reply to message #71010] |
Sun, 17 January 2010 07:53 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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That may take more time than the original uploading. Tough to edit.
When I've done it, I end up with blanks where photos used to be and I
can't get rid of the blanks.
On Sun, Jan 17, 2010 at 6:38 AM, Ken Henderson <ken0henderson@gmail.com> wrote:
> Not for YEARS! I almost gave up trying to find them. How the heck did
> y'all find them buried in there?
>
> I'd completely forgotten about that odd-ball 2-way check valve I used 'cause
> I had it. It may still be there.
>
> Thanks for prompting me to look. I REALLY need to clean up my albums --
> eliminate about half of them & update the rest.
>
> Ken H.
>
> On Sat, Jan 16, 2010 at 9:58 PM, Kosier <gkosier@roadrunner.com> wrote:
>
>> Ken,
>>
>> Have you looked at the pictures you put on Photosite?
>>
>> Gary Kosier
>>
>>
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>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] The pause that makes you heart skip [message #71016 is a reply to message #71013] |
Sun, 17 January 2010 08:36 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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Yeah, me too, Steve. That's one of the big reasons I've got such a
mish-mash out there. Sure wish the software allowed a complete album dump
which we could edit with whatever tools we like. It needs a mass upload
capability too so that the updated album could be uploaded, including
captions.
Ken H.
On Sun, Jan 17, 2010 at 8:53 AM, Steven Ferguson <botiemad11@gmail.com>wrote:
> That may take more time than the original uploading. Tough to edit.
> When I've done it, I end up with blanks where photos used to be and I
> can't get rid of the blanks.
>
> On Sun, Jan 17, 2010 at 6:38 AM, Ken Henderson <ken0henderson@gmail.com>
> wrote:
> ...
>
> Thanks for prompting me to look. I REALLY need to clean up my albums --
> > eliminate about half of them & update the rest.
>
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