Re: Engine RPM

Posted by Greg Hitt on February 16, 1998 at 20:03:19

In Reply to: Re: Engine RPM
posted by Bob Carabbio on February 16, 1998 at 10:01:00

: with standard gearing & tires -
: About 2200 at 50
: About 2000 at 45
: Idle = 100 - 250 rpm ballparky.
: Bob Carabbio
With standard gearing and 19" wheels:
2400 rpm at 45mph
2600 rpm at 50mph
Idles at 800rpm with spark advanced
500 rpm with spark retarded.
I have a 6 volt tach in my 31 coupe, and that is what it reads.With 21" wheels it would be about 150 rpm less than what I stated above.Gas engines cannot idle at 100- 250rpm.They don't stay running much lower than 300-400 rpm.Running a Model A engine lower than 500rpm is hard on it due to its splash oiling system.It would not get enough oil into the cylinders/pistons at a low idle speed.
Greg

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