#31
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Re: Porpoising Seavette
Whoopsie, I missed the part about the bravo being a 4 blade...
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there's no such thing as normal anymore... |
#32
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Re: Porpoising Seavette
Steve, I don't think a Paxton blower on a high compression motor will work well. My brother had an underdriven Paxton on his '76 Mustang II Cobra. It worked well enough until he had his heads milled and rebuilt the valve train and installed new dome pistons to obtain an 11.25:1 compression ratio. (At that time Paxton reccomended a max comp ratio on the stock Ford 302 of 9.5:1)
His crankcase pressure was so high at high revs he would blow immense quantities of oil out of the breather, and somehow he eventually hydraulic'd the motor with oil blow-by , and had it come apart completely. It even blew the oil pan loose on the bottom.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury |
#33
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Re: Porpoising Seavette
Steve.. Have you tried a 4" drive extender, to set the drive back 4". My old Wellcraft Nova did the same thing and the drive extender solved the problem for me.
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Don Battin Pipe Dreams Marine "Design her right, Build’er well Bend the throttles, And let’er eat…." Carl Moesly |
#34
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Re: Porpoising Seavette
Quote:
Frank, I know about the compression. I could probably get away with a little boost however ideally I would need to cut the compression back to around 8.5:1 for it to work right. That will probably never happen but it doesn’t hurt to talk about it.
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Steve B 1978 23ft SeaCraft Seavette 502HP ZZ502 Mercruiser TRS Drive-Sold-UGH! 1998 28ft Carolina Classic 7.4 Volvo Penta Duo Prop |
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