How many rpm does a top fuel dragster turn at 9500 rpm and 4.5 second quarter mile?

Answer 1

As stated, it turns at 9500 RPM. Over the whole course, it will turn 712.5 revolutions.

Fuel engines are, in a way, rpm limited. The slow combustion of nitro (the reason you see the wing-high flames) is to blame. RPMs very seldom go over 8000 in a race. They begin (called the "hit") at the starting line at about 7200, then the clutch 'catches up' to the engine rpm, and you will hear another slight drop in rpm at mid-track when the clutch discs 'lockup'. Then the engine will again accelerate to the finish line; about 8000rpm. At the current performance levels, the actual total times the engine turns over during a run (1000ft. track and @8000 max rpm) would be closer to 500. Therefore each cylinder fires 250 times per run. Sure seems like a $75,000 engine could do that. But a lot of times, they CAN'T!

Your question itself is erroneous. You obviously were trying to ask how many revolutions the engine's crankshaft would turn during the 4.5 seconds it takes to run the quarter mile. Yes it, would turn 712.5 revolutions.

But you didn't ask how many revolutions it would turn; you asked how many revolutions per minute(i.e., RPM) it would turn. Not the information you were seeking. Just as the distance from my home to Miami (1426 miles) says nothing about speed (1426 miles per hour).