ported plenum on a305
Member
Joined: Jul 1999
Posts: 299
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If you have other intake mods such as filter,cold air,foil,ported mass air meter....yes it will help a bit.
You need to attack the intake as a whole to really reap any gains.
I have a ported plenum on my 88 305 TPI along with the above mods and it runs very well.
You need to attack the intake as a whole to really reap any gains.
I have a ported plenum on my 88 305 TPI along with the above mods and it runs very well.
Moderator
Joined: Jan 2000
Posts: 19,653
Likes: 309
84,
The plenum bores just behind the throttle body are the single most restrictive point in the induction system, so it would only stand to reason that there would be some advantage. As stated, these advantages will be more apparent as teh modifications continue, but for the cost of a set of plenum gaskets it's a good start.
If you are more curious, check this file:
Plenum Porting.pdf
You'll nedd Adobe Acrobat Reader to open the file (see below).
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
The plenum bores just behind the throttle body are the single most restrictive point in the induction system, so it would only stand to reason that there would be some advantage. As stated, these advantages will be more apparent as teh modifications continue, but for the cost of a set of plenum gaskets it's a good start.
If you are more curious, check this file:
Plenum Porting.pdf
You'll nedd Adobe Acrobat Reader to open the file (see below).
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
Senior Member
Joined: Aug 1999
Posts: 611
Likes: 0
From: Glendale, AZ
My first mod was to port the plenum. It didn't feel any faster, but it did feel much smoother reving up in the rpm's. Adding the headers is what gave me the biggest gain on the 305.
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Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.
48psi regulator, (Nickel method)
------------------
Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.
48psi regulator, (Nickel method)
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Posts: n/a
<font face="Verdana, Arial" size="2">Originally posted by Vader:
The plenum bores just behind the throttle body are the single most restrictive point in the induction system</font>
The plenum bores just behind the throttle body are the single most restrictive point in the induction system</font>
Cant wait to see what happens when I knock these walls down... see if I cant push the HP up a bit more. Think I should do it?
This is on the engine with the siamesed base btw... told you the plenum wasnt ported.. heh...
Yea, it can help, anything can help on a 305... it needs all the help it can get.
[This message has been edited by madmax (edited August 10, 2001).]
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