Originally Posted by
Moseley
no offense mike but I'm a little skeptical of this 300whp number. making 300whp requires a certain amount of wtq at a certain rpm. so take your pick:
300whp = 210wtq @ 7500
300whp = 196wtq @ 8000
300whp = 185wtq @ 8500
300whp = 175wtq @ 9000
looking at those numbers it is obvious that the easiest way to make 300whp with a honda is to rev it to 9k and still be making at least 175wtq at that rpm. But when stroke, rod length, or compression are changed... the cam requirement of the engine is changed also. I guess what I'm trying to say is don't expect a cam that makes 250whp on a stock stroke, to be worth a damn on a bottom end with different geometry, no matter how awesome the bottom end is, you might only see 5-10whp. I also hope you aren't planning on the 196wtq @ 8000 route... because that would be more VE than a cammed K20, and with a longer stroke that is pretty much impossible.
So on a legit dyno jet, I think 270-280whp from an H is pretty feasible. but just like 1/4 mile times, every little bit is more and more difficult to achieve. I'd expect it to take a perfect cam for the application, 13:1 or higher, proper fuel like Q16, perfect header and intake manifold, all dialed in... and at least 2.4L to have an H make 300whp. the only reason I say that is because it takes many of those same things to have a K make a legit 300whp, and I would expect the H to be a little more difficult due to the head design.