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5 mph increase dreaming


Would love to obtain 5 mph increase in cruising speed. I know it would be difficult if not impossible. We have a 440 MY with CAT 3126s rated at 420 hp each, ZF transmissions with a 2.9:1 ratio and 30x33 propellers.

We can reach 15 mph at 2250 RPMs.

Is there any way to obtain a speed increase without excessive drive train wear and to do it economically?

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