Originally Posted by
fs5
i dunno guys,i reckon if your turning big rpms on a stock motor it gives you a gain.i've got a stock merc seapro 55 ,i modded the gearbox to let most of the exhaust exit above the prop.i made a little pate up to bolt on when i was fishing to shut it up.
i found running big pitch props where the motor only revs around 5500/5800 it made no noticable difference,but when i bolted on a smaller prop and the motor reved over 6100 it made a definate difference to the topend revs ,i reckon it picked up an easy 100+ rpms.
just my 2cents worth.
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