Quote:
Originally Posted by Dominik
I agree on various numbers for losses due to poor exhaust design, but one shouldn't add 80 - 100Hp as a default to rwHp just to make it sound good at the next bench racing session.
And I don't agree on the 20% losses for the drivetrain. Your transmission engineers would kill you for that bad percentage. Also, nobody rated a Nascar 750Hp 358cui at 1.000Hp just because the valve train and friction took away 250Hp at max rpm.
Fact is, the 427 has a very bad drag coefficient. We tested it in 1995 with GM's (OPEL) engineering team on the German A5 Frankfurt-Darmstadt (no speed limit).
+/- 570Hp (DIN) to get to 198mph in the late 60s? Very much achievable by Dick Smith's engine builder. What windshield did he use??
But we will never change this SAE/DIN debate :-)
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It's more than just the transmission. I agree if it was a 20% loss in just the transmission due to resistance the transmission would get very hot.
It takes power to turn the transmission, and you also have to overcome the flow of the transmission fluid. That's why all modern transmissions use ATF fluid instead of the 90 weight gear
oil they used to use. Same holds true for the rear end. Disk brakes drag and that takes power to over come. Axle bearings have resistance. It just goes on and on.