Changing Props not Lower Unit
09-01-2005, 11:48 AM
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Changing Props not Lower Unit
I'm trying to figure out how to get a proper propeller for my soon to be re-powered boat without changing the lower unit of my SX leg. I went from a 3.0l to a 4.3l. Gear ratio is approx 1.97:1 currently. WOT should be about 4400 for the 3.0l vs 4800 for the 4.3.
Any ideas other than 200rpm per 1"pitch. How does the gear ratio affect RPM with a stronger engine same prop?
Any ideas other than 200rpm per 1"pitch. How does the gear ratio affect RPM with a stronger engine same prop?
09-01-2005, 01:37 PM
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Re: Changing Props not Lower Unit
Go to this BAM site and you can play around with plugging in numbers...
http://go-fast.com/Prop_Slip_Calculator.htm
What size and weight boat??
http://go-fast.com/Prop_Slip_Calculator.htm
What size and weight boat??
