Re: Frankly I'm surprised

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Posted by Greg Coffin [] on Wednesday, August 30, 2023 at 16:21:24 :

In Reply to: Re: Frankly I�m surprised� posted by Marty [] on Wednesday, August 30, 2023 at 13:46:35 :

Those hp numbers are based on sea level. He's at 8500 ft plus, so derate those by 4% per thousand feet. That's about 34%, and your 120hp at the wheels drops to 80hp. Try going up an 8% grade with that! You'll be in second gear with 4.89s. Guess how I know that?

I get approx 160hp at the crank from sea level to 10,000ft at 5lbs boost. A turbo (or belt driven supercharger) is the ONLY way to get that kind of performance from a 230 flathead at altitude. There just isn't enough air/oxygen available otherwise.

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