pontiac

anyone done it? here's my idea. cut the crap out between the runners and weld some aluminum plate to cover it

then just do the runners and plenum to fit, sunglass porting, etc. runners lenght will equal to manifold base and everything else will be the plenum.

and you'll have 300hp monster

seriously, anyone tryed it?

-P

rezinn

I had thought about that.. if you have a junk pair of runners go ahead and try it. It may turn out badly on a stock engine, though.

smokin87iroc

haven't fooled with the stock runners but i have siamesed the base. that way i can pull from 2 runners for each cylinder and shorten the runner length a bit.
what you are doing is shortening the runner length making the intake "tuned" to a higher rpm. but with cutting and welding if you don't do it right you can get some vaccume leaks and/or very rough weld on the inside disturbing the flow of air. either way you will see a gain in horsepower. by doing things on the intake and exhaust side you really don't see much of a gain in torque you really just shift your torque curve up or down in the rpm range
what i'm going to do over christmas break and what you should probably do when you take you intake off and all is port your heads as well. then you will see torque gains.
as for siamesing the base i'm going to siamese the base all the way to 1 inch from where the fuel injectors spray. that way the fuel won't over lap to the other cylinders and starve cylinders.
siamesing the runners would help me move my powerband up some more but then you loose that stock look.
i will change my cam later on to probably a lt4 hot cam or similar but i want to see how far you can take the stock cam and how well it does.
if you have any more questions you can post or email me. my 14.11 and 14.2x times in my sig are with the siamesed intake.

------------------
Andrew Peery
1987 IROC, 305 TPI, T5
Hooker Competition Ceramic Coated Headers, Custom y-pipe, Cutout, Flowmaster, Ported Plenum
All smog equipment gone and no cat
before headers
192hp and 265tq
15.20 @ 92.5 mph 2.4 60ft
After Headers
14.480 @ 95.01mph 2.194 60ft
With y-pipe
14.23 @ 96
2.16 60ft
with cut-out
14.11 @ 97.7 2.17 60ft


[This message has been edited by smokin87iroc (edited December 07, 2001).]

442guy

i thought about that too, but the aluminum is so thin on the runners. sound like your gonna try and melt the $hit outa your runners, and then end up buyin a set anyway.

Ions91Z28

I remember reading about someone who was planning to do this, and they had said that because of the metal being thin and all, the head of the welding would probably warp it pretty good, and it wouldn't work as well. Who knows though, try it with some spare runners.

RCR

If you know how to weld aluminum, it shouldn't be a problem. It's what AS&M does, except the use larger tubing.