| Long version of a short story [message #106558] |
Tue, 23 November 2010 13:37  |
Gil Slaw
Messages: 69
Registered: May 2006
Location: Hampshire, IL
Karma: 0
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I need to tap the collective wisdom of this group once again.
When I bought my coach I discovered a significant lateral crack on the floor of the intake manifold and I decided to replace the cast iron piece with an Edlebrock Performer.
After 5 years of tripping over 3 versions of the dog house I give up!
I found a perfect Toronado intake last week and I plan on installing it over the next few days and now my delema:
I have fabricated a pair of stainless plates from a ground down
kichen knife that would never stay sharp.
The question is should I drill, say 1/4 inch hole in each plate to give some early heat to the TBI, or should they remain blank??
Any thoughts?
Gil Slaw
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| Re: [GMCnet] Long version of a short story [message #106562 is a reply to message #106558] |
Tue, 23 November 2010 13:41  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Gil,
I would not drill holes in the "blocking plates". Just pick your favorite choke replacement option.
Dennis
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Gil Slaw <gslaw700@sbcglobal.net>
To: gmclist@temp.gmcnet.org
Sent: Tue, Nov 23, 2010 1:37 pm
Subject: [GMCnet] Long version of a short story
I need to tap the collective wisdom of this group once again.
When I bought my coach I discovered a significant lateral crack on the floor of
he intake manifold and I decided to replace the cast iron piece with an
dlebrock Performer.
After 5 years of tripping over 3 versions of the dog house I give up!
I found a perfect Toronado intake last week and I plan on installing it over the
ext few days and now my delema:
I have fabricated a pair of stainless plates from a ground down
ichen knife that would never stay sharp.
The question is should I drill, say 1/4 inch hole in each plate to give some
arly heat to the TBI, or should they remain blank??
Any thoughts?
Gil Slaw
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Long version of a short story [message #106597 is a reply to message #106596] |
Tue, 23 November 2010 22:22 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have the stainless blocking plates installed. I can not imagine why I would want holes in them. With the turkey tray removed there is plenty of hot oil splashing on the bottom of the manifold and with it bolted to the heads with hot coolant running through everything it is just about impossible for the manifold not to be at engine operating temperature (180 degrees or more). The whole idea in blocking the intake cross over is to get the carb temperature lower. Drilling holes in the plates would, in my opinion, make the carb temp go higher.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Long version of a short story [message #106613 is a reply to message #106598] |
Wed, 24 November 2010 12:08 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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I tried to get mine filled with aluminum at a small foundry but the guy couldn't get the manifold warm enough to pour in the aluminum it kept blowing back at him. So I just filled it with furnace cement and wire feed welded a plate on each crossover port. Not a real strong weld job but it doesn't have to be. I then cut the Mr. Gasket gaskets and inserted slightly thinner stainless inserts.
roy
e title=Larry wrote on Tue, 23 November 2010 20:38]In addition to the SS plates, consider filling the intake crossover with aluminum. I took mine and several others to a local foundry and had them poured. The used intake gaskets without the crossover holes and SS plates. Here are pics of the pouring.
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4571[/quote]
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Long version of a short story [message #106653 is a reply to message #106558] |
Wed, 24 November 2010 20:13 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Holes may burn out larger over time.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Long version of a short story [message #106654 is a reply to message #106652] |
Wed, 24 November 2010 20:12 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Still a recommended modification when using headers. Still have the
same issues weather you have headers or manifolds.
J.R. Wright
On Nov 24, 2010, at 8:50 PM, kp wrote:
>
>
> When I switched to headers I noticed that the intake manifold was a
> lot cooler and it took longer to come off the choke fast idle. If
> you have headers I'm not sure that its necessary to block off the
> heat riser at all.
>
> Mind you, the wall between the two middle exhaust ports are welded
> on mine so the ports are not joined at all, which may contribute to
> the reduction of exhaust flow in the intake manifold.
>
> Heat in the manifold is a good thing to stop the fuel condensing on
> the walls. The problem with the original olds design was that it was
> too large for a 12000 lb vehicle and overheated the intake manifold,
> causing it to crack.
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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: Long version of a short story [message #106691 is a reply to message #106652] |
Thu, 25 November 2010 00:28 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have headers and blocking plates and a 180 degree thermostat. I have never noticed a problem with warm up or running down the road.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Long version of a short story [message #106791 is a reply to message #106691] |
Fri, 26 November 2010 10:06 |
tze73
Messages: 13
Registered: August 2010
Location: Montreal, Quebec
Karma: 0
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I have read that the engineers heated the manifolds to improve fuel distribution. When the fuel condenses on the walls of the manifold it will flow more to one cylinder and not the other.
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