drive wheel size September 04, 2009 02:01PM
what is the formula to figure out cog wheel size. crank 5000 rpm, water injection pump 3400 rpm what size crank cog wheel do i need and what size pump cog wheel do i need? what is the math for this Thanks
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Re: drive wheel size September 04, 2009 03:33PM
Are you saying that you want the pump to turn 3400 RPM when the engine is turning 5000 RPM? If so any pair that makes the same ratio as 3400/5000 = 0.68

34 driving 50 (34 on crank & 50 on pump) and 17 driving 25 are the only ones that make that exact ratio and keep the pulley sizes reasonable.
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Re: drive wheel size September 05, 2009 12:09AM
so that works out to a 2.5 dia. drive cog on crank to a 3.5 dia driven cog on water injection pump Thanks
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Re: drive wheel size January 09, 2012 03:02AM
Quote
failed math
what is the formula to figure out cog wheel size. crank 5000 rpm, water injection pump 3400 rpm what size crank cog wheel do i need and what size pump cog wheel do i need? what is the math for this Thanks

5000/3400 = 1.47 ,cog wheel on the pump must be 1.47 times bigger than on the motor
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