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#1
10-11-2009, 04:19 PM
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| prop is too much work for engine change diam/pitch I have a twin screw 220 hp engines and a 1-1 ratio with 15x12 federal 3 blade props boat goes good but i can tell that top end just isn't there engines seem to be working to hard should I drop my diam or pitch and how much?  |
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#4
10-14-2009, 05:54 AM
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| I assume it is a 4.3 gas engine. The max RPM should be 4300 to 4800. You need more diameter or more pitch. Two inches of pitch should lower the RPM aobut 300 to 4700.
__________________ Gonzo |
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#5
10-14-2009, 06:05 AM
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| Well that will make them work harder. I think he meant rev too hard perhaps? Mr gtt increasing pitch or diam is like going up a gear, so it will work harder in HP terms but will rev less,--like changing gear on a car --the RPM's come down. Its possible you wont see much if any increase in speed. Do you normally drive full power all the time? |
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