I've been told different

nofearengineer · 06-14-12, 10:11 AM

An outboard motor has no slip between the crankshaft and the prop shaft; there is no clutch or torque converter like in a car transmission. Therefore, a certain rpm on the crankshaft will always produce the same relative speed, no matter what other conditions are.

However, I am skeptical that you could produce the same power at the same rpm at two elevations 5000 ft apart. You'd have to be playing some major games with your air/fuel ratio. Even if possible, it would likely be very bad for the motor, and the EPA would probably be chasing you all over the lake for the black, sooty exhaust you'd be spewing out.

A tradeoff would be to slightly raise the gear ratio between the prop shaft and crankshaft, and live with the loss of torque and throttle response.

06-14-12, 10:11 AM	#3
nofearengineer BassFishin.Com Premier Elite Join Date: Mar 2009 Location: Southwest IN Posts: 5,630	An outboard motor has no slip between the crankshaft and the prop shaft; there is no clutch or torque converter like in a car transmission. Therefore, a certain rpm on the crankshaft will always produce the same relative speed, no matter what other conditions are. However, I am skeptical that you could produce the same power at the same rpm at two elevations 5000 ft apart. You'd have to be playing some major games with your air/fuel ratio. Even if possible, it would likely be very bad for the motor, and the EPA would probably be chasing you all over the lake for the black, sooty exhaust you'd be spewing out. A tradeoff would be to slightly raise the gear ratio between the prop shaft and crankshaft, and live with the loss of torque and throttle response. __________________ Many men go fishing all of their lives without knowing it is not fish they are after.

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