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Old 03-09-2016, 07:38 PM   #1
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Tach RPMs

1990 Flair 460 motor. at 55mph my tach says 4500-5000 rpm... would you suspect tach itself, or engine problem? Any idea what it should run at? Thanks
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Old 03-10-2016, 01:29 AM   #2
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If I can remember right, my two older gas MH's without OD, the tach read around 3000 RPM at 60 MPH? I would suspect the tach is not reading right, or you have a transmission slipping badly! Rail!
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Old 03-10-2016, 02:03 AM   #3
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What tranny do you have............3 speed?

What rear end gearing.........4:56?

3000 RPM of under at 60 mph

For 1990 460 V8
Peak torque is at 2200 RPM
Peak horsepower is at 3600 RPM


4500-5000 RPM on a 460 V8..........BOOM!
Long stroke------piston thru block

Besides it would be SCREAMING at those RPM
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Old 03-10-2016, 06:38 PM   #4
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Thanks guys. that's what I was worried about. Trans is a 3 speed, no overdrive. don't know the gear ratio. Now to find someone to check it without costing 175.00. the motorhome is 22' and i get 10mph per gallon. Gonna have to find out how to hook up a different tach to check the other one.

as far as shifting, it revs pretty high, but not excessively, between 1st and 2nd. then between 2 and 3 you cant tell it shifted at all. Never really settles down between gears....
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