Hey I keep hearing how incredibly hard it is to get 250RWHP out of our f20, I know its all about breathing, but ive seen 3.8 liter sixes with 600 n-a hp at the wheels, given i dont know the reliablity, but how could they make so much hp, also with these engines each cylinder had its own throttlebody, would a setup like this be the key to high na hp?

 

Were these 6-cylinders that you refer to running on pump gas? What was their compression ratio? At what RPM did they make 600hp? Were these sixes still "streetable"?

I'm sure 300rwhp is possible on an NA F20C... but you won't have much of the original F20C left. You'll probably have to balance & blueprint the engine, re-sleeve the block, put in high compression pistons (which are hopefully stronger and lighter), stronger (and maybe lighter) rods, different cams with a very aggressive (read: not streetable) cam profile, maybe larger valves, and definitely lightened/strengthened valves and other goodies so you can raise the rev-limiter, lots of headwork and work to the intake/exhaust manifolds to improve flow, run race gas, and add a very expensive aftermarket ECU to keep the thing from blowing itself up. Since we're talking about wheel hp here, you would probably also put on a lightened clutch/flywheel, maybe a lighter driveshaft, and some lightweight wheels.

But, why do that when you can slap on a turbo/supercharger and get the same amount of rwhp and gobs more mid-range torque? I think there are a couple of people on here doing NA buildups "just because they can", with the knowledge that they'll spend lots more money than an FI setup and won't have nearly the power in the end.

 

The more I read about FI, the more I want it!!! Though there's nothing wrong with NA. I just think the S with FI is BANANAS. Just my .02

 

Regarding individual throttle bodies, these help primarily in throttle response, and not necessarily outright power increase.

 

Hams2000 is the only one I can think of off hand that did a full, first class NA build up. 12.5 CR pistons, new crank,block, aftermarket rods (lighter,stronger), lots of head work, full AEM EMS, etc. He built it himself, but as far I know has never posted a full write up on how it is to drive it. He was expecting perhaps 265 whp or so, and he invested something like $12k without labor.

 

Heres a thought about an awesome NA engine. Just add this rotary valve system along with stronger internals and you should be good to go. Mind you, it'd probably be expensive to get it adapted to the f20c..

http://www.coatesengine.com/index1.html

They made 487hp on a ford 5.0 with no other parts.. It also lowers emissions and raises mpg ect... Sounds like a cure all.. Read the page for more info.

 

One more link to a good article on that system.

http://www.coatesengine.com/lookmom_noCamshaft.htm

And it was 475hp, not 487hp. Sorry..

 

What's so impressive about 475hp from a 5.0 liter V-8? A 4.0 V-8 version of the F20C should have 480hp.

 

Well, if you read the article, the engine also was able to rev to 14,000rpms.. Could a 4.0L F20c do that too? I wasn't saying anything about 475hp being impressive out of a 5.0. What is impressive is the fact that the engine went from 260 to 475 with just a change in the valve system. That's what's impressive.