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texasred · 11-20-2007, 06:27 PM

"True" RPM (actual engine revolutions per minute) at any given miles per hour is a function of differential gearing, tire size, traction and transmission slippage (auto or clutch). Don't confuse a measurement of revolutions with actual revolutions.

The signal from the tach, wiring, or tach may be going bad or need to be recal'ed, but you didn't change the "true" RPM with a different distributor.

C.J.

11-20-2007, 06:27 PM	#8 (permalink)
texasred Super Moderator Join Date: Apr 2004 Location: San Antonio, Texas Posts: 807	"True" RPM (actual engine revolutions per minute) at any given miles per hour is a function of differential gearing, tire size, traction and transmission slippage (auto or clutch). Don't confuse a measurement of revolutions with actual revolutions. The signal from the tach, wiring, or tach may be going bad or need to be recal'ed, but you didn't change the "true" RPM with a different distributor. C.J. __________________ Home of the 1971 Cutlass Supreme convertible Super Karate Monkey Death Car.