Porting Plenum and Upper Runners
Thread Starter
Instructor
Joined: Apr 2004
Posts: 240
Likes: 0
From: St. Louis MO
Porting Plenum and Upper Runners
Hey all, I have an EGR code being thrown, so, I'm about to take it off and give it a good cleaning and check the solenoid and vacuum.
While I have the runners and plenum off, I was thinking about porting them. Any good tips? Do I need to do any other mods to accomodate the porting? This is something that I have never done before, but I am not afraid to try.
Anyone?? :cheers:
EDIT
Need some info from me I'd imagine.
It's a 1988 coupe with 127,XXX, K&N, no frisbee, gutted main cat.
[Modified by 88vettelover, 12:32 AM 5/18/2004]
While I have the runners and plenum off, I was thinking about porting them. Any good tips? Do I need to do any other mods to accomodate the porting? This is something that I have never done before, but I am not afraid to try.
Anyone?? :cheers:
EDIT
Need some info from me I'd imagine.
It's a 1988 coupe with 127,XXX, K&N, no frisbee, gutted main cat.
[Modified by 88vettelover, 12:32 AM 5/18/2004]
Le Mans Master
Joined: Jan 2002
Posts: 5,320
Likes: 4
From: Kyle TX (Because Mojo Made me fill it in)
Re: Porting Plenum and Upper Runners (88vettelover)
Here are some pics of when I did mine.
http://home.austin.rr.com/vettenoob/Modifications.htm
Just remember NOT to knife edge the runners like you see in the pictures. I've heard that causes turbulance. I dont think you really need to do any other "mods" if you dont want to. If you happen to have the tpi base off, you can siamese those too to get a bit more out of it too.
Mine was done with a dremel tool. It took 2-3 hours a week for over a month for me to do mine, but I was in no furry since I bought a spare tpi setup to do it.
Good luck.
http://home.austin.rr.com/vettenoob/Modifications.htm
Just remember NOT to knife edge the runners like you see in the pictures. I've heard that causes turbulance. I dont think you really need to do any other "mods" if you dont want to. If you happen to have the tpi base off, you can siamese those too to get a bit more out of it too.
Mine was done with a dremel tool. It took 2-3 hours a week for over a month for me to do mine, but I was in no furry since I bought a spare tpi setup to do it.
Good luck.
Drifting
Joined: May 2002
Posts: 1,509
Likes: 3
From: Hazel Park MI
Re: Porting Plenum and Upper Runners (88vettelover)
I siamesed my plenum, and just stuck rags in the runners and smoothed out the edges around the runners opening them up more. I got a little more throttle response out of her. :seeya
Burning Brakes
Joined: Dec 2002
Posts: 1,088
Likes: 0
From: Lakeland fl
Re: Porting Plenum and Upper Runners (88vettelover)
I would invest in the appropriate aluminum cutting bur for an air grinder if you have a compressor. The burs can be found at my local swap meet for less than $10 in numerous shapes, and the air die grinder is under $20 at Harbor frieght. This does require an air compressor though- but it would be way faster than a dremel.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Porting Plenum and Upper Runners (88vettelover)
Since you have both plenum & runners off:
-lay the lower runner tube on a block of wood and roll a medium socket inside the lower runner over the "dimple" while tapping on the socket extension. This will smooth out the dimples to open up the tubes a little.
-flair the upper runner tubes a little and port match the plenum openings to them; then round the inner plenum openings. You will need oversized upper runner gaskets or take a Dremel to open up stock gaskets.
-remove the two bumps inside the plenum input openings, reduce the center "hump" and remove material as possible from the two outer walls.
Definitely do the TB coolant bypass while it is off the plenum.
-lay the lower runner tube on a block of wood and roll a medium socket inside the lower runner over the "dimple" while tapping on the socket extension. This will smooth out the dimples to open up the tubes a little.
-flair the upper runner tubes a little and port match the plenum openings to them; then round the inner plenum openings. You will need oversized upper runner gaskets or take a Dremel to open up stock gaskets.
-remove the two bumps inside the plenum input openings, reduce the center "hump" and remove material as possible from the two outer walls.
Definitely do the TB coolant bypass while it is off the plenum.
Thread Starter
Instructor
Joined: Apr 2004
Posts: 240
Likes: 0
From: St. Louis MO
Re: Porting Plenum and Upper Runners (65Z01)
Thanks everyone!!
I have an air compressor, but no grinder, seems like just the excuse I need to get one!! (Shh! Don't tell the wife!)
Will do the TB bypass too!!! :cheers: :yesnod:
I have an air compressor, but no grinder, seems like just the excuse I need to get one!! (Shh! Don't tell the wife!)
Will do the TB bypass too!!! :cheers: :yesnod:
