High compression build up ?'s

[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!

[fantabulous]

goodluck with your project. id like to see someone build an all motor ka using 4 individual throttle bodies with individual velocity stacks. that would look sick. the best way to decide plenum size, is to use a flowbench. keep on modifying the plenum until you see the measurement in "inches of water" rise to its max. best way to flowbench a plenum, mount the plenum to the head, then put the head on the flowbench. if you dont have access to a flowbench. make a home-made one. a flowbench is nothing but a 30k vacuum cleaner. if you watch myth-busters, they make a homemade one for that. but for automotive purposes, you just need a cooler or a box strong enough to support weight of a head. a variable resistor switch, a vacuum cleaner, tubes, water, and dye. maybe ill do a write up on this later. flowbenches are plus. just get flow on every cyl a close to each other as possible. goodluck.ps. go with the individual throttle bodies!

[frapjap]

There a guy on the boards who did the itb thing. I think hes Devious Ka. I havent gotten to talk to him yet, but I'd sure like to. ITB would be awesome and much more efficient. I haven't much knowlege on how to do that though. Definitely do a write up on that flowbench, for I haven't an idea where to find one, let alone make it. It'd be a great help.