plenum insulators?
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Joined: Sep 2004
Posts: 98
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From: Las Vegas Nevada
plenum insulators?
What is the best place to get the plenum insulators?
Do you guys just use GM gaskets or something else?
I'm going to pull my plenum and I want to have a set on hand in case I need it.
Do you guys just use GM gaskets or something else?
I'm going to pull my plenum and I want to have a set on hand in case I need it.
Melting Slicks
Joined: Apr 2005
Posts: 3,241
Likes: 163
From: Folsom CA
Lingenfelter used to make them, but I don't know if they do any more.
I've read that the insulators can cause hood fitment issues, there's not a lot of room between the plenum and the underside of the hood. (less than .5 inch)
Do a search in the Archives for "Plenum Spacers" and "Plenum Insulators". You might be surprised at what you find.
Kurt White (www.whiteracingproducts.com) sells the gaskets.
TomC
'90ZR1 #792
Last edited by Crabs; Feb 1, 2007 at 08:11 PM.
Drifting
Joined: Nov 2004
Posts: 1,599
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From: Farmington, UT
Drifting
Joined: Jul 2002
Posts: 1,932
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From: LPE Aerobody 416 ci, Oklahoma
I've got a used set (they don't wear out). They are 1/4" thick. You could stick some clay at various spots on your plenum to see how much room you have. Also require a little bending of the 1/4" vac tube on the LH side as it mounts with plenum bolts. $100 + Shipping will buy them. Let me know.
Jerry
Jerry
Melting Slicks
Joined: Apr 2005
Posts: 3,241
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From: Folsom CA
Race Director
Joined: Jul 1999
Posts: 16,282
Likes: 104
From: Sun city CA
I disagree... We checked plenum temps at Spring MT last March and saw a 15 degree difference. Does it translate into more power ? Hard to say.
I heard it also makes port matching a bit easier. That could very easily make some more power if you had a 90-92 with a sloppy match from the factory.
I heard it also makes port matching a bit easier. That could very easily make some more power if you had a 90-92 with a sloppy match from the factory.
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Drifting
Joined: Jun 2002
Posts: 1,491
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From: Portland Oregon
For most people I think the insulators are going to be more trouble than they are worth. First off you may or may not have hood clearance issues (easy to check with some play-doh). You will have some PCV line fitament issues. You will need two gaskets for each side which combined with the insulator plate in the middle makes plenum reinstalls a chore. Longer plenum bolts are also advisable.
I spent a lot of time and effort making mine work. I semi-permenently attached the insulators to the plenum with small screws to avoid the multi-gasket reinstall hassle. I also carefully port matched the plates so they wouldn't disturb the intake air flow and become counter productive.
In short they are a lot of work for questionable gain.
I spent a lot of time and effort making mine work. I semi-permenently attached the insulators to the plenum with small screws to avoid the multi-gasket reinstall hassle. I also carefully port matched the plates so they wouldn't disturb the intake air flow and become counter productive.
In short they are a lot of work for questionable gain.
Race Director
Joined: Jul 1999
Posts: 16,282
Likes: 104
From: Sun city CA
For most people I think the insulators are going to be more trouble than they are worth. First off you may or may not have hood clearance issues (easy to check with some play-doh). You will have some PCV line fitament issues. You will need two gaskets for each side which combined with the insulator plate in the middle makes plenum reinstalls a chore. Longer plenum bolts are also advisable.
I spent a lot of time and effort making mine work. I semi-permenently attached the insulators to the plenum with small screws to avoid the multi-gasket reinstall hassle. I also carefully port matched the plates so they wouldn't disturb the intake air flow and become counter productive.
In short they are a lot of work for questionable gain.
I spent a lot of time and effort making mine work. I semi-permenently attached the insulators to the plenum with small screws to avoid the multi-gasket reinstall hassle. I also carefully port matched the plates so they wouldn't disturb the intake air flow and become counter productive.
In short they are a lot of work for questionable gain.
Joking aside... thier has been at least one article in the Koth addressing port matching and it was a worthwhile mod according to the author. Port matching and a temperature drop sounds better than simply "questionable" I think we need to have a beer and discuss this further...
Last edited by Zrxmax; Feb 3, 2007 at 02:51 AM.
Race Director
Joined: Jul 1999
Posts: 16,282
Likes: 104
From: Sun city CA
