Home » Public Forums » GMCnet » Re: [GMCnet] Quardrajet Cooling
| Re: [GMCnet] Quardrajet Cooling [message #94342] |
Mon, 02 August 2010 15:23  |
James Moore
Messages: 71
Registered: January 2004
Karma: 0
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Bob,
The one I installed is 1/4 inch thick and replaced the stock carb to manifold gasket which is about 1/4 inch thick.
The post earlier about installing sleeves on things to protect them from heat from headers made me wonder if headers contribute to vapor lock. I have stock exhaust manifolds on my rig because I don't like the heat given off by headers. I have only one car with headers and it came from the factory with the pipes wrapped in an insulating tape and has heat shield to keep the heat from the top of the engine. I have a friend in the coating business and he claims he can coat headers and they will run so cool you can put your hand on them when running. Don't know if it is B.S.
Maybe someone will do a survey to see how many GMC,s with vapor lock have headers.
Jim
-----Original Message-----
>From: Bob de Kruyff <NEXT2POOL@AOL.COM>
>Sent: Aug 2, 2010 4:02 PM
>To: gmclist@temp.gmcnet.org
>Subject: Re: [GMCnet] Quardrajet Cooling
>
>
>
>""There are at least two Mr. Gasket kits for the Quadrajet, a 1/4" and a 1/2."
>I suppose bigger is better if it fits.If it doesn't you could just leave out
>a layer or two. $17 at Summit.
>"
>
>Watch the clearance to the underside of the engine cover. i suspect a lot of loose Qjets get help from rubbing on the hatch.
>--
>Bob de Kruyff
>78 Eleganza
>Chandler, AZ
>_______________________________________________
>GMCnet mailing list
>List Information and Subscription Options:
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| Re: [GMCnet] Quardrajet Cooling [message #94364 is a reply to message #94363] |
Mon, 02 August 2010 19:56  |
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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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Mac,
The QJ mounts to the manifold with bolts so you can stack up as much as you
like under it and just get longer bolts.
Unfortunately there is not a lot of clearance between the top of the air
cleaner and the bottom of the engine hatch.
To check it accurately you can take out your wheel well liners and measure
it.
Regards,
Rob M.
USAussie
PS - I have installed the Mr. Gasket kit (I think it's 1/4" or so thick)
under my QJ on an aluminum manifold and have no clearance issues.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of D C *Mac* Macdonald
Sent: Monday, August 02, 2010 8:49 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
Can anybody advise how much extra length exists
on the carb mounting studs? Enough to add the
1/2 inch spacer? Or are bolts use for mounting?
Coach is in a gravel storage lot and temps are
running over 100 F, or I'd go check myself.
Yeah, I know I'm a candya$$. I don't handle
such temperatures very well at 72.
~ ~ ~ ~ ~ ~ ~ ~ ~
~ Mac Macdonald ~
~ Oklahoma City ~
~~ "Money Pit" ~~
~ '76 ex - P.B. ~
~ ~ ~ ~ ~ ~ ~ ~ ~
----------------------------------------
Date: Mon, 2 Aug 2010 16:23:45 -0400
From: j.moore.jr@mindspring.com
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
Bob,
The one I installed is 1/4 inch thick and replaced the stock
carb to manifold gasket which is about 1/4 inch thick.
-----Original Message-----
From: Bob de Kruyff
Sent: Aug 2, 2010 4:02 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
There are at least two Mr. Gasket kits for the Quadrajet, a 1/4" and a 1/2.
I suppose bigger is better if it fits.If it doesn't you could just leave out
a layer or two. $17 at Summit.
Watch the clearance to the underside of the engine cover. i suspect a lot of
loose Qjets get help from rubbing on the hatch.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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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] Quardrajet Cooling [message #94372 is a reply to message #94364] |
Mon, 02 August 2010 20:25 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Thanks, Rob.
I think I'll just order the 1/2 incher and pull out as many
intermediate layers as needed for clearance as Bob Kruyff
suggested.
~ ~ ~ ~ ~ ~ ~ ~ ~
~ Mac Macdonald ~
~ Oklahoma City ~
~~ "Money Pit" ~~
~ '76 ex - P.B. ~
~ ~ ~ ~ ~ ~ ~ ~ ~
From: robmueller@iinet.net.au
To: gmclist@temp.gmcnet.org
Date: Mon, 2 Aug 2010 20:56:47 -0400
Subject: Re: [GMCnet] Quardrajet Cooling
Mac,
The QJ mounts to the manifold with bolts so you can stack up
as much as you like under it and just get longer bolts.
Unfortunately there is not a lot of clearance between the top
of the air cleaner and the bottom of the engine hatch.
To check it accurately you can take out your wheel well
liners and measure it.
Regards,
Rob M.
USAussie
PS - I have installed the Mr. Gasket kit (I think it's 1/4" or so thick)
under my QJ on an aluminum manifold and have no clearance issues.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of D C *Mac* Macdonald
Sent: Monday, August 02, 2010 8:49 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
Can anybody advise how much extra length exists
on the carb mounting studs? Enough to add the
1/2 inch spacer? Or are bolts use for mounting?
Coach is in a gravel storage lot and temps are
running over 100 F, or I'd go check myself.
Yeah, I know I'm a candya$$. I don't handle
such temperatures very well at 72.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ Mac Macdonald ~
~ Oklahoma City ~
~~ "Money Pit" ~~
~ '76 ex - P.B. ~
~ ~ ~ ~ ~ ~ ~ ~ ~
----------------------------------------
Date: Mon, 2 Aug 2010 16:23:45 -0400
From: j.moore.jr@mindspring.com
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
Bob,
The one I installed is 1/4 inch thick and replaced the stock
carb to manifold gasket which is about 1/4 inch thick.
-----Original Message-----
From: Bob de Kruyff
Sent: Aug 2, 2010 4:02 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Quardrajet Cooling
There are at least two Mr. Gasket kits for the Quadrajet, a 1/4" and a 1/2.
I suppose bigger is better if it fits.If it doesn't you could just leave out
a layer or two. $17 at Summit.
Watch the clearance to the underside of the engine cover. i suspect a lot of
loose Qjets get help from rubbing on the hatch.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Quardrajet Cooling [message #94595 is a reply to message #94342] |
Wed, 04 August 2010 12:16 |
Firefly
Messages: 98
Registered: May 2008
Location: Augusta, Maine
Karma: 0
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You DO NOT have to remove a wheel well liner in order to ascertain the air-cleaner-to-hatch clearance.
Simply do it this way:
1. Obtain some plumber's putty or modeling clay; make three 2" balls out of it. Make sure it isn't sticky - coat them lightly with vegetable oil.
2. Open the engine hatch and place the three clay balls on top of the air cleaner, distributed equally around the lid.
3. Close and latch the lid; open it again and you will have three squashed balls indicating exactly how much clearance you have in your particular coach.
Remember, don't assume that your clearance will be the same as some other owner's dimensions:
Our coaches have varying sizes and styles of cut-outs routed into the underside of the plywood for air cleaner clearance - each one varies by year sometimes and PO's may have done something that affects the clearance (e.g., carb spacers, motor mounts, insulating body pads and mounts, air cleaner assembly, intake manifold, etc.)
Mark Scoble, Lunenburg, MA - 1973 23' Palm Beach Stretched to 32' and in residence at the GMC Co-Op in Orlando, FL
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| Re: [GMCnet] Quardrajet Cooling [message #94597 is a reply to message #94595] |
Wed, 04 August 2010 12:43 |
Ken Coit
Messages: 151
Registered: November 2005
Karma: 0
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Senior Member |
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That's a great idea, but you might want to stand on the hatch to be certain
your clay is squashed adequately. Other wording came to mind, but I chose
"clay is."
Ken
On Wed, Aug 4, 2010 at 1:16 PM, Mark Scoble <worldnet@aol.com> wrote:
>
>
> You DO NOT have to remove a wheel well liner in order to ascertain the
> air-cleaner-to-hatch clearance.
>
> Simply do it this way:
>
> 1. Obtain some plumber's putty or modeling clay; make three 2" balls out of
> it. Make sure it isn't sticky - coat them lightly with vegetable oil.
>
> 2. Open the engine hatch and place the three clay balls on top of the air
> cleaner, distributed equally around the lid.
>
> 3. Close and latch the lid; open it again and you will have three squashed
> balls indicating exactly how much clearance you have in your particular
> coach.
>
> Remember, don't assume that your clearance will be the same as some other
> owner's dimensions:
> Our coaches have varying sizes and styles of cut-outs routed into the
> underside of the plywood for air cleaner clearance - each one varies by year
> sometimes and PO's may have done something that affects the clearance (e.g.,
> carb spacers, motor mounts, insulating body pads and mounts, air cleaner
> assembly, intake manifold, etc.)
> --
> Mark Scoble, Augusta, Maine - 1973 23' Palm Beach Stretched to 32' and
> undergoing complete renovation at the GMC Co-Op
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Ken Coit, ND7N
Raleigh, NC
Parfait Royale
1978 Royale Rear Bath, 403, 3.07
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