Is horsepower on older cars from fly wheel or rear tires?

Question

I am looking at a '65 plymouth sport fury with a 383 that is rated at 325 hp. Did the factory calculate this from the engine or from the rear tires? Thanks

Answer 1

from the fly

Answer 2

this is calculated from the engine not from what it puts down on the ground what it puts to the ground is probably about 250 or 300 somewhere around there like i had a 89 mazda rx7 na it says 170 horses but put to the ground was like 130  now my 93 rx7 puts around 450 to the ground

Answer 3

they do it both. they measure it at the flywheel before they put it in the car to get the crankshaft horsepower, then on the drivewheels to get the brake horsepower

Answer 4

i believe it might have been from the engine. if not, then it might depend on the make

Answer 5

yep, from the flywheel.  for RWHP, take off about 15% from flywheel power.

Answer 6

From the engine only.

Manufactures started on some models in 1994 to measure from rear wheels. It is mandatory from Dept.of Transportation and EPA that it is from rear wheels on all OBD II automobiles be posted for horsepower.

That 383 seems like it puts more than 325 out the rear wheels than late model 325 listed!

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Answer 7

Back then the factory's also did sandbagging and so the number is really a guess at best. It could have put out 400hp or 300hp you never know. Back then the rules weren't that strict. And none of them are putting out what they did then, when they rolled out 48 years ago.