Cruising rpm

3

30ratrodder

Junior Member
I think that i might have to play around with gear ratios in my ****** and rearend. I have a 4" crank in my flathead. What is the maximum rpm that i can run safely while cruising and not blowing the sucker up?
Thanks
 
Cruising RPN is based on the cam, or the middle of the torque curve. Get a copy of jWL's book and you'll see what the torque curves look like. The stock cam runs best from 1600 to 2200 after that it begins to fall off. Running the engine at a higher RPM probably wont hurt it too much, but it won't be very economical.
 
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