tpi manafold questions....
Thread Starter
Member
Joined: Mar 2001
Posts: 255
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From: Beaver Dam, WI
Car: 1987 IROC-Z
Engine: 350
Transmission: T-5
tpi manafold questions....
since im about to reasemble my engine.... i have a few questions. regarding my manafold and tpi system....
1)what is the mushroom thing in the middle of my manafold?
2) the little air tubes on the runners, what purpose do those serve?
ive heard of people plugging those little tubes, what does that do?
i'm doing little mods to my car as i build it.... ported the plenum, did a removing of the casting numbers in the head and i'll be doing that to the manafold....
stuff like that....
thanx
sunbound
1)what is the mushroom thing in the middle of my manafold?
2) the little air tubes on the runners, what purpose do those serve?
ive heard of people plugging those little tubes, what does that do?
i'm doing little mods to my car as i build it.... ported the plenum, did a removing of the casting numbers in the head and i'll be doing that to the manafold....
stuff like that....
thanx
sunbound
Senior Member
Joined: Aug 1999
Posts: 611
Likes: 0
From: Glendale, AZ
That mushroom thing is your EGR valve, and the tubes are where the exhaust gases reenter the intake system.
Whats with removing the casting numbers? I don't see what purpose this can serve.
------------------
Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.
48psi regulator, (Nickel method)
Whats with removing the casting numbers? I don't see what purpose this can serve.
------------------
Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.
48psi regulator, (Nickel method)
Thread Starter
Member
Joined: Mar 2001
Posts: 255
Likes: 0
From: Beaver Dam, WI
Car: 1987 IROC-Z
Engine: 350
Transmission: T-5
just removing the casting numbers inside the ports.... EGR valve does what again? is their any advantage to plugging those little holes?
sunbound
sunbound
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Joined: Jan 2000
Posts: 19,655
Likes: 309
SB,
The "mushroom" is probably the EGR. It should look like this:
Teh diagnostic temperature sensor is identified because without this you will get an error code, and the MIL lamp will constantly stare you in the face. You can remove and block the EGR if you wish, but I wouldn't advise it. The EGR can help cool the chambers and allow higher timing advance. A properly functioning system not only won't cost you any power, but may allow you to produce more. If you don't understand this, go to www.sethirdgen.org and read the article by GM Tech. He explains it pretty thoroughly.
As for the smaller tube on the runners, they are used for both EGR and idle air distribution. Without the tubes, there would be no air to distribute the fuel from the cold start injector to the cylinders. Later TPI engines without cold start don't use the tubes for this purpose, but I recall you having a pre-1989 engine.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
The "mushroom" is probably the EGR. It should look like this:
Teh diagnostic temperature sensor is identified because without this you will get an error code, and the MIL lamp will constantly stare you in the face. You can remove and block the EGR if you wish, but I wouldn't advise it. The EGR can help cool the chambers and allow higher timing advance. A properly functioning system not only won't cost you any power, but may allow you to produce more. If you don't understand this, go to www.sethirdgen.org and read the article by GM Tech. He explains it pretty thoroughly.
As for the smaller tube on the runners, they are used for both EGR and idle air distribution. Without the tubes, there would be no air to distribute the fuel from the cold start injector to the cylinders. Later TPI engines without cold start don't use the tubes for this purpose, but I recall you having a pre-1989 engine.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
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