500 HPs in a 312 fastech
#1
21 and 42 footers
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Thread Starter
500 HPs in a 312 fastech
I sold my Formula 312 this summer but a local mechanic I know is installing 500EFI's in a 312. The boat had the 454/330's and he is asking if I can suggest a prop pitch. Mine with 502 mags and 1.65 bravos (1.65 was standard) ran a 30 pitch 4 blade.
I seem to remember someone had put 500's in a 312 but don't remember who. Anyone familiar with a 312 that had the power upgraded? Looking for prop suggestions.
I seem to remember someone had put 500's in a 312 but don't remember who. Anyone familiar with a 312 that had the power upgraded? Looking for prop suggestions.
#2
VIP Member
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Re: 500 HPs in a 312 fastech
If it has 1.50 Bravos then I would start with a 32" Bravo 1.
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#3
21 and 42 footers
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Re: 500 HPs in a 312 fastech
Originally Posted by Smitty
If it has 1.50 Bravos then I would start with a 32" Bravo 1.
#4
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Re: 500 HPs in a 312 fastech
Strongly suggest 1.50 gears. 1.65's will require way large props that will be very ineffieciant on a 312. We Procharged a 312 with 454 Mags several years ago and the 1.65's just would not work. We wound up with 1.50's and 34 Bravos labbed down to 33's.32's might be about right with 500's.
#7
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Re: 500 HPs in a 312 fastech
The Procharged boat ran low 90's if I recall,but that was maybe 8 or 9 years ago,my memory is really bad. I do recall it handled well up to high 80's, a little loose above that,but customer ran it hard for several years with no issues.
#8
21 and 42 footers
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Thread Starter
Re: 500 HPs in a 312 fastech
Originally Posted by mpally
What kind of speeds will a 312 w/ 500's run? That seems like a lot of hp for a 31 Formula. How do they handle at those speeds?
#10
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Re: 500 HPs in a 312 fastech
my old 311 had 502's and had 26's, straight hull older and heavier, I would start at at least 30's...