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I posted this in the Boating Forum, but not much interest. If y'all want to move it or delete it, fine.

I am looking to repower Starsine, a 39" Sea Ray Express Cruiser (1989), it has vintage 1989 twin 7.1 liter (330 H.P.) gasoline Mercruiser engines. I wanted diesel, but too expensive, so now I'm looking at Crusader 8.1 HO engines. The Mercruisers currently get 4 Gal. to the mile ( I know thats crazy and I'm looking a tweaking my props), but I still think I need much more horsepower. If someone of y'all have the expertise and time to discuss this w/me I would appreciate it.
Thanks, John
281-367-4156
 

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starshine said:
I posted this in the Boating Forum, but not much interest. If y'all want to move it or delete it, fine.

I am looking to repower Starsine, a 39" Sea Ray Express Cruiser (1989), it has vintage 1989 twin 7.1 liter (330 H.P.) gasoline Mercruiser engines. I wanted diesel, but too expensive, so now I'm looking at Crusader 8.1 HO engines. The Mercruisers currently get 4 Gal. to the mile ( I know thats crazy and I'm looking a tweaking my props), but I still think I need much more horsepower. If someone of y'all have the expertise and time to discuss this w/me I would appreciate it.
Thanks, John
281-367-4156
John, I think I would start with a call to Sea Ray's customer service folks. Surely the topic of repower on a hull like yours has come up before. It may save some research time.

E Dock Bob
 

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you might want to think about the cummins marine conversion i checked into it and it was about half the price of marine diesels. just check your shafts struts cutlass make sure it will handle the load. big gas boats suck way too much gas

just curious what is your rpm cruise speed?
 
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