Quote:
Originally Posted by Scott Roberts
I'm gonna say those 60's engines were underrated on hp.. my understanding is that was common practice..
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I WOULD TOTALLY DISAGREE WITH THAT SENTENCE.
I was fortunate to have access to a Clayton Rear Wheel Dynometer at the college down the road from where I lived.
They had a Automotive program there. A/C work, Engine work, Chassis work, some welding classes, etc.
On the Calibrated Clayton Dynometer several vehicles that the Hot Rod Boys owned were tested.
1) A 375 hp advertised 396 1966 Chevelle made 285 rear wheel hp.
285 hp times 1.15 = 327 engine horsepower. the 15% adder is the typical drop from engine to tire hp loss.
The 375 HP rating was probably correct if you tested the engine without the water pump/fan drag and the accessory drag.
(Power steering). Looks Dead Nuts on the money to me.
Tom V.