How much power do engine mods yield?
Killer6,
It was pretty much an all-out effort to go fast,in a mid-sixties A-body.
After he had spent lots and lots of hours, modifying this car for drag racing, it was a whole lot faster than a stock slant six 225 1968 Dart..... at 14-flat and 98mph.
It just seems to me, that, going fast is a whole lot harder with a naturally-aspirated slant six than is should be.... and, I am pretty-sure that the small ports and valves we're stuck with, is the problem...:cheers:
A 98mph trap speed should net a 13.60 ET w/a dialed in drivetrain/chassis setup.
Assuming an as raced wt. of 3000lbs.w/driver and a full tank,that would tick off at
230hp at the wheels,use any"at the crank"guestimations at your own risk.Now,this
is theoretical,but has been proven in practice enuff to be accepted..follow;220CFM
is capable of supporting approx.440hp in a V-8 w/a fairly aggressive cam profile.
More for rollers,less for street cams,that is the "rule of thumb",and theres specific
formulas for these numbers.But we all know that isn't how it goes in the real world
and combustion chambers,plug location,thermal layout,etc.,etc.,all alter the real
output.Plugging in 220CFM still gives you a 330HP potential,and I'm sure some
have bumped up against that.Still,at 300HP for a punched /6,that would be more
like 574HP if it were a 440,so the real problem is simply uh,the engine is small!
You have no trouble convincing me about the beauty of turbos,I got hooked on
them when I worked at a CPD dealer in '86,and I own a number of them.I am
picking up another 170 for such a project,slated for a '64 GT conv.,but the coupe
is getting the orig. .060" over 225 I built yrs. ago w/some definite improvements.
And my '90 omni has a 2.5turbo voyager drivetrain waiting to go in........:D