Home » Public Forums » GMCnet » Intake crackkkkkkeeeed
| Intake crackkkkkkeeeed [message #126105] |
Sat, 14 May 2011 20:45  |
Rickmo
Messages: 105
Registered: January 2011
Location: Gladwin, Michigan
Karma: 0
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Senior Member |
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I checked my intake and the crack between the secondary ports goes all the way down,across, and up the other side. Where can I find a stock intake? The aluminum one is nice but a bit out of reach, all things considered.
Rick Seebeck
Gladwin Michigan
1973 Canyon Lands
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| Re: Intake crackkkkkkeeeed [message #126106 is a reply to message #126105] |
Sat, 14 May 2011 20:48  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| Rickmo wrote on Sat, 14 May 2011 20:45 |
I checked my intake and the crack between the secondary ports goes all the way down,across, and up the other side. Where can I find a stock intake? The aluminum one is nice but a bit out of reach, all things considered.
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Rick,
If Dick Paterson builds your new engine he may have one.
Or, this was posted recently -- Bob Stone bought a lot of inventory from Michael Bozardt.
bob stone & Associates,8159 Day Road, Carbondale, IL 62902.
Call: 1(619)964-9124
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126115 is a reply to message #126105] |
Sat, 14 May 2011 21:42 |
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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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Rick,
It has been noted here that finding a cracked intake manifold on a GMC is
the norm. If you want a new manifold that isn't cracked it needs to come off
a Toronado.
Jim K sells them:
http://www.appliedgmc.com/prod.itml/icOid/569
However, as I understand it if you fill the exhaust crossover with aluminum
you can save it.
Also there is this method:
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4537
Regards,
Rob M.
USAussie - Downunder
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 Rick
Sent: Saturday, May 14, 2011 8:45 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Intake crackkkkkkeeeed
I checked my intake and the crack between the secondary ports goes all the
way down,across, and up the other side. Where can I find a stock intake?
The aluminum one is nice but a bit out of reach, all things considered.
--
Rick Seebeck
Gladwin Michigan
1973 Canyon Lands
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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: Intake crackkkkkkeeeed [message #126121 is a reply to message #126105] |
Sat, 14 May 2011 21:59 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Rickmo wrote on Sat, 14 May 2011 20:45 |
I checked my intake and the crack between the secondary ports goes all the way down,across, and up the other side. Where can I find a stock intake? The aluminum one is nice but a bit out of reach, all things considered.
|
Don Hart.. Are you around? Can you help a fellow GMCer from Michigan?
If not, then you need to start looking for one from a Toronado. If you get a Toronado one you will have to get a plate to block off the EGR port. Also on re-installation get the blocking plates for the exhaust crossover from Dick Paterson. I know he also had the plate to go over the choke heater tube so he might have the plate for the EGR.
Some people in the past before the aluminum manifold became available use to fill the inside of the intke exhaust crossover with "Mondello Metal". I thought it was Zinc. I haven't heard of people doing it since the aluminum manifold became available.
Jim K. has installed and sold a lot of new aluminum ones. Maybe he has a good take off. Shipping will kill you as it is very heavy and Jim loves to use UPS.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Intake crackkkkkkeeeed [message #126135 is a reply to message #126105] |
Sun, 15 May 2011 01:01 |
spiffycar
Messages: 133
Registered: May 2010
Location: Brook Park ,Ohio
Karma: 1
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Senior Member |
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Take a few "minutes" and rummage through the your local Craiglist adds for your surrounding areas.You might be surprised at what you can find for old engine parts. Search for Olds 455 and Olds 425 as they were both used in the Toros.
Paul W L
76 Daytona Beach! ( EX-Palm Beach )
Cleveland,OH
& Current Card Carrying Pull A Part VIP Member
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126136 is a reply to message #126105] |
Sun, 15 May 2011 01:11 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Rick,
call Tom Hampton and see if he might have one.
The reason for the crack is bad mufflers. One is partially plugged and
causing exhaust to flow through the intake to the other side.
On Sat, May 14, 2011 at 6:45 PM, Rick <mrseebeck@gcsnet.org> wrote:
>
>
> I checked my intake and the crack between the secondary ports goes all the way down,across, and up the other side. Â Where can I find a stock intake? Â The aluminum one is nice but a bit out of reach, all things considered.
>
>
> --
> Rick Seebeck
> Gladwin Michigan
> 1973 Canyon Lands
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126147 is a reply to message #126136] |
Sun, 15 May 2011 06:48 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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Almost every intake we see is cracked, this seems to be SOP for the concave
intake we have. We block off the crossover every time, fixes it. No need to
look for another original intake, they will crack as well, use a Mr. Gasket #404
intake gasket set and a set of Mondello SS block off plagtes and be done with
it, this also does away with the turkey tray. Yes, you may have a muffler
issue, put the muffler in the back and be done with blowing out mufflers. These
are things we do, opinions may vary,
Jim Bounds
------------------------------
----- Original Message ----
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 15, 2011 2:11:36 AM
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
Rick,
call Tom Hampton and see if he might have one.
The reason for the crack is bad mufflers. One is partially plugged and
causing exhaust to flow through the intake to the other side.
On Sat, May 14, 2011 at 6:45 PM, Rick <mrseebeck@gcsnet.org> wrote:
>
>
> I checked my intake and the crack between the secondary ports goes all the way
>down,across, and up the other side. Where can I find a stock intake? The
>aluminum one is nice but a bit out of reach, all things considered.
>
>
> --
> Rick Seebeck
> Gladwin Michigan
> 1973 Canyon Lands
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: Intake crackkkkkkeeeed [message #126152 is a reply to message #126105] |
Sun, 15 May 2011 07:46 |
Rickmo
Messages: 105
Registered: January 2011
Location: Gladwin, Michigan
Karma: 0
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Senior Member |
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Thanks again! I have installed brand new mufflers and will order the block off kit today.
Motor coming out this morning! Updates and photos are coming.
Rick
Rick Seebeck
Gladwin Michigan
1973 Canyon Lands
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126156 is a reply to message #126152] |
Sun, 15 May 2011 08:06 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rick,
Don't confuse "block off kit" with "pouring the crossover". The block off
plates will prevent exhaust gas flow through the crossover with the
accompanying ill side effects, like cracked manifold. But they WON'T
correct the vacuum leak through the already created crack. For that, you'll
have to fill the crossover. Rob sent the link to a "plastic solution",
about which I've heard no empirical results.
Here's how I've used the "Mondello Metal" (a zinc alloy). Others have
poured aluminum instead (or had it done at a foundry).
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3115
<http://www.gmcmhphotos.com/photos/showgallery.php?cat=3115>
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sun, May 15, 2011 at 8:46 AM, Rick <mrseebeck@gcsnet.org> wrote:
>
>
> Thanks again! I have installed brand new mufflers and will order the block
> off kit today.
>
> Motor coming out this morning! Updates and photos are coming.
>
> Rick
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126157 is a reply to message #126147] |
Sun, 15 May 2011 08:22 |
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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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Jim,
I'm confused!
As I understand it there is a chamber under the intake runners that allows
the exhaust to "crossover" from head to head.
The intake off Double Trouble was cracked at the bottom of the intake
runners AND the bottom of the crossover.
I don't understand how blocking the crossover ports in the heads would
prevent engine vacuum from the intake runners lowering the pressure in the
blocked crossover and sucking in oil vapor from the lifter valley. It would
also cause a vacuum leak.
Regards,
Rob M.
USAussie - Downunder
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 Jim Bounds
Sent: Sunday, May 15, 2011 6:49 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
Almost every intake we see is cracked, this seems to be SOP for the concave
intake we have. We block off the crossover every time, fixes it. No need
to
look for another original intake, they will crack as well, use a Mr. Gasket
#404
intake gasket set and a set of Mondello SS block off plagtes and be done
with
it, this also does away with the turkey tray. Yes, you may have a muffler
issue, put the muffler in the back and be done with blowing out mufflers.
These
are things we do, opinions may vary,
Jim Bounds
------------------------------
----- Original Message ----
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 15, 2011 2:11:36 AM
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
Rick,
call Tom Hampton and see if he might have one.
The reason for the crack is bad mufflers. One is partially plugged and
causing exhaust to flow through the intake to the other side.
On Sat, May 14, 2011 at 6:45 PM, Rick <mrseebeck@gcsnet.org> wrote:
>
>
> I checked my intake and the crack between the secondary ports goes all the
way
>down,across, and up the other side. Where can I find a stock intake? The
>aluminum one is nice but a bit out of reach, all things considered.
>
>
> --
> Rick Seebeck
> Gladwin Michigan
> 1973 Canyon Lands
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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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] Intake crackkkkkkeeeed [message #126172 is a reply to message #126157] |
Sun, 15 May 2011 11:48 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Normally, the crossover carries exhaust, not inbtake. Consequently, it's under pressure,not vacuum.
--johnny
--- On Sun, 5/15/11, Rob Mueller <robmueller@iinet.net.au> wrote:
From: Rob Mueller <robmueller@iinet.net.au>
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
To: gmclist@temp.gmcnet.org
Date: Sunday, May 15, 2011, 1:22 PM
Jim,
I'm confused!
As I understand it there is a chamber under the intake runners that allows
the exhaust to "crossover" from head to head.
The intake off Double Trouble was cracked at the bottom of the intake
runners AND the bottom of the crossover.
I don't understand how blocking the crossover ports in the heads would
prevent engine vacuum from the intake runners lowering the pressure in the
blocked crossover and sucking in oil vapor from the lifter valley. It would
also cause a vacuum leak.
Regards,
Rob M.
USAussie - Downunder
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 Jim Bounds
Sent: Sunday, May 15, 2011 6:49 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
Almost every intake we see is cracked, this seems to be SOP for the concave
intake we have. We block off the crossover every time, fixes it. No need
to
look for another original intake, they will crack as well, use a Mr. Gasket
#404
intake gasket set and a set of Mondello SS block off plagtes and be done
with
it, this also does away with the turkey tray. Yes, you may have a muffler
issue, put the muffler in the back and be done with blowing out mufflers.
These
are things we do, opinions may vary,
Jim Bounds
------------------------------
----- Original Message ----
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 15, 2011 2:11:36 AM
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
Rick,
call Tom Hampton and see if he might have one.
The reason for the crack is bad mufflers. One is partially plugged and
causing exhaust to flow through the intake to the other side.
On Sat, May 14, 2011 at 6:45 PM, Rick <mrseebeck@gcsnet.org> wrote:
>
>
> I checked my intake and the crack between the secondary ports goes all the
way
>down,across, and up the other side. Where can I find a stock intake? The
>aluminum one is nice but a bit out of reach, all things considered.
>
>
> --
> Rick Seebeck
> Gladwin Michigan
> 1973 Canyon Lands
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126178 is a reply to message #126172] |
Sun, 15 May 2011 12:31 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Johnny, if the manifold is cracked through the floor of the carb base, like
many of them are, vacuum from the running engine will pull exhaust gasses
into the incoming air fuel mixture, or if the crossover is blocked, it will
pull oil vapor & in some cases liquid oil from the lifter valley and also
dilute the incoming air/fuel mixture. Either way, it makes for a really
crappy running engine. I personally have tried various methods to repair
cracked manifolds, and have found that the best method is to replace the
manifold with one that does not have the exhaust crossover. On a 403, an
Edelbrock Performer is a direct bolt on, with no hatch cover interference.
On a 455, the only alternative is the Rockwell aluminum one. It is the
uneven heating from the exhaust gasses through the crossover right next to
the much cooler water jackets that stresses the iron manifolds to the point
of cracking. Block the passage, you block most of the heat. If you do have
an iron manifold that is uncracked, block the crossover and run it until it
does crack. It is not if, it is when, in my opinion.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Sun, May 15, 2011 at 9:48 AM, Johnny Bridges <jhbridges@ymail.com> wrote:
> Normally, the crossover carries exhaust, not inbtake. Consequently, it's
> under pressure,not vacuum.
>
> --johnny
>
> --- On Sun, 5/15/11, Rob Mueller <robmueller@iinet.net.au> wrote:
>
>
> From: Rob Mueller <robmueller@iinet.net.au>
> Subject: Re: [GMCnet] Intake crackkkkkkeeeed
> To: gmclist@temp.gmcnet.org
> Date: Sunday, May 15, 2011, 1:22 PM
>
>
> Jim,
>
> I'm confused!
>
> As I understand it there is a chamber under the intake runners that allows
> the exhaust to "crossover" from head to head.
>
> The intake off Double Trouble was cracked at the bottom of the intake
> runners AND the bottom of the crossover.
>
> I don't understand how blocking the crossover ports in the heads would
> prevent engine vacuum from the intake runners lowering the pressure in the
> blocked crossover and sucking in oil vapor from the lifter valley. It would
> also cause a vacuum leak.
>
> Regards,
> Rob M.
> USAussie - Downunder
> 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 Jim Bounds
> Sent: Sunday, May 15, 2011 6:49 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Intake crackkkkkkeeeed
>
> Almost every intake we see is cracked, this seems to be SOP for the concave
> intake we have. We block off the crossover every time, fixes it. No need
> to
> look for another original intake, they will crack as well, use a Mr. Gasket
> #404
> intake gasket set and a set of Mondello SS block off plagtes and be done
> with
> it, this also does away with the turkey tray. Yes, you may have a muffler
> issue, put the muffler in the back and be done with blowing out mufflers.
> These
> are things we do, opinions may vary,
>
> Jim Bounds
> ------------------------------
>
>
>
> ----- Original Message ----
> From: Jim Kanomata <jimkanomata@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Sun, May 15, 2011 2:11:36 AM
> Subject: Re: [GMCnet] Intake crackkkkkkeeeed
>
> Rick,
> call Tom Hampton and see if he might have one.
> The reason for the crack is bad mufflers. One is partially plugged and
> causing exhaust to flow through the intake to the other side.
>
>
>
> On Sat, May 14, 2011 at 6:45 PM, Rick <mrseebeck@gcsnet.org> wrote:
> >
> >
> > I checked my intake and the crack between the secondary ports goes all
> the
> way
> >down,across, and up the other side. Where can I find a stock intake? The
> >aluminum one is nice but a bit out of reach, all things considered.
> >
> >
> > --
> > Rick Seebeck
> > Gladwin Michigan
> > 1973 Canyon Lands
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126181 is a reply to message #126105] |
Sun, 15 May 2011 12:45 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
|
Senior Member |
|
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Rick,
I just got back from the GMCGL Rally in Port Sanilac just north of
Port Huron,
Give me a call, I have 2 in the shop and I am just 30 minutes from you.
JR Wright
On May 14, 2011, at 9:45 PM, Rick wrote:
>
>
> I checked my intake and the crack between the secondary ports goes
> all the way down,across, and up the other side. Where can I find a
> stock intake? The aluminum one is nice but a bit out of reach, all
> things considered.
>
>
> --
> Rick Seebeck
> Gladwin Michigan
> 1973 Canyon Lands
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126217 is a reply to message #126178] |
Sun, 15 May 2011 16:33 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Well, yeah, if it cracks clear through. Nver saw one crack that badly, but as I said,my experience runs to LA, A, and B/RB Mopar stuff. I has learned - and am no more thrilled with GM engines than I was :)
--johnny
--- On Sun, 5/15/11, James Hupy <jamesh1296@gmail.com> wrote:
From: James Hupy jamesh1296@gmail.com
Johnny, if the manifold is cracked through the floor of the carb base, like
many of them are, vacuum from the running engine will pull exhaust gasses
into the incoming air fuel mixture, or if the crossover is blocked, it will
pull oil vapor & in some cases liquid oil from the lifter valley and also
dilute the incoming air/fuel mixture.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Intake crackkkkkkeeeed [message #126221 is a reply to message #126105] |
Sun, 15 May 2011 17:13 |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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JB,,,,its not the design of the GM engines its the lack of repacing a bad muffler. With one muff having more restiction than the other, hot exhaust will cross from one side to the other!!,,,,PL
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126228 is a reply to message #126221] |
Sun, 15 May 2011 18:49 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Yeh. Many of the Mopars use a seperate valley covert hough. Maters not what you bust, you won't pull oil into the intake. Which is moot, since the coach fits the GM.
Along these lines, I wonder if you'd reduce underhood heat by louvering the front access panels. Our vans do a lot of siting idling ( 2 to 4 hours at a time) and we require the techs to open the hoods. On an Econoline, one coke can set on the radiator brace opens the hood all the way back to the cowl an inch or so at the rear. This is enough to knock and incredible amount of heat out of the motor box, which evidences itself as greatly reduced accesory failure (batteries, alternators, stering pumps) as well as increased overall engine life. If no one has investigated this, I'll stick a probe in (if I remember it) on the way home next weekend, and on the way to my next show which the panels removed, and note the difference in rise.
--- On Sun, 5/15/11, Paul Leavitt <leavittpaul@yahoo.com> wrote:
From: Paul Leavitt <leavittpaul@yahoo.com>
Subject: Re: [GMCnet] Intake crackkkkkkeeeed
To: gmclist@temp.gmcnet.org
Date: Sunday, May 15, 2011, 10:13 PM
JB,,,,its not the design of the GM engines its the lack of repacing a bad muffler. With one muff having more restiction than the other, hot exhaust will cross from one side to the other!!,,,,PL
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Intake crackkkkkkeeeed [message #126234 is a reply to message #126228] |
Sun, 15 May 2011 19:33 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Johnny, Many of us run with no inner fenders, and shark gill vents through
the body sides to reduce heat in the engine compartment. Perhaps after you
become more familiar with the quirks of the GMC motor home, you will come up
with the solution to cracked intake manifolds, the cure for which has eluded
some of us for 30 plus years or so.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Sun, May 15, 2011 at 4:49 PM, Johnny Bridges <jhbridges@ymail.com> wrote:
> Yeh. Many of the Mopars use a seperate valley covert hough. Maters not
> what you bust, you won't pull oil into the intake. Which is moot, since the
> coach fits the GM.
>
> Along these lines, I wonder if you'd reduce underhood heat by louvering the
> front access panels. Our vans do a lot of siting idling ( 2 to 4 hours at a
> time) and we require the techs to open the hoods. On an Econoline, one coke
> can set on the radiator brace opens the hood all the way back to the cowl an
> inch or so at the rear. This is enough to knock and incredible amount of
> heat out of the motor box, which evidences itself as greatly reduced
> accesory failure (batteries, alternators, stering pumps) as well as
> increased overall engine life. If no one has investigated this, I'll stick
> a probe in (if I remember it) on the way home next weekend, and on the way
> to my next show which the panels removed, and note the difference in rise.
>
>
> --- On Sun, 5/15/11, Paul Leavitt <leavittpaul@yahoo.com> wrote:
>
>
> From: Paul Leavitt <leavittpaul@yahoo.com>
> Subject: Re: [GMCnet] Intake crackkkkkkeeeed
> To: gmclist@temp.gmcnet.org
> Date: Sunday, May 15, 2011, 10:13 PM
>
>
>
>
> JB,,,,its not the design of the GM engines its the lack of repacing a bad
> muffler. With one muff having more restiction than the other, hot exhaust
> will cross from one side to the other!!,,,,PL
> _______________________________________________
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> GMCnet mailing list
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