N/A KA Buildup

[frapjap]

Alright, I am planning out an n/a / high compression KA build up and have come to a few concerns. At the moment I am working on getting my long runners cut and putting together a custom intake manifold. I plan on dremeling as well. (pistons, rods, cams, and the rest come later)

Through some reading and researching, I have come to conclude that the "new" runners should be 8.5 inches long, with (if possible) a 1.5 inch width at each port. This seems reasonable to me, as it will be short enough to get the rpms higher and peak torque for a longer duration (though I will loose some in the bottom end.) I'm not extremely concerned.

However, that is background information, this is where my questions lie:

-As far as a plenum goes, I am unsure how large it should be. Reading, I can gather that it should be bigger than the displacement of the motor (2.4l) but am not sure how much bigger and was wondering if anyone has a measure or formula to come to a conculsion.

-Also, I considered re-using the original plenum/tb and welding it to my modified runners. Is the original sufficient, or is it restrictive and/or not practical for what I plan on doing with it?

- I noticed that those who decide on an n/a build up use a Q45 maf/tb. Is there a reason for this or just because it is the largest aviable?

If anyones got any ideas, tips, experiments for me to try, drop a line. Thanks!

Modified by frapjap at 6:36 PM 10/4/2004
Modified by frapjap at 12:18 AM 10/5/2004

[MikeMurphy]

yes, from what i understand its simple used due to a larger diameter on the Q45 supplies.