stoutman450f

If you increase the horsepower to 550 in a 28 Heat, what kind of speed do you estimate that would produce?

Is there any formula that you can use to estimate speed and horsepower.

Has a 1.5 drive on it with no spacer. I was thinking about putting a 1" spacer as many of the Heat owners have done.

Any suggestions or comments would be great - thanks.

johnlomant

I would guess 75 to 78 gps

CB-BLR

I agree with John, 75-78 mph.

You will need a Bravo 28 pitch Bravo prop .. possibly thinned and sharpened if you need a little more rpm.

Definately go for the 1" spacer. This will increase your midrange speed by 2-3mph, and give you another 2 mph on the top end regardless of wheather or not you do the horsepower increase.

Chris

P.S. I have an extra 1" spacer I will sell you complete with new seals and hardware -- $200

fireman1594

Will the spacer help any with a stock 496? Sorry to hijack your thread.

CB-BLR

fireman,

Yes, if your Heat is a 2000 or newer, it will increase your midrange speed by 2-3 mph, and usually give you about 2 mph on the top end.

Chris

bobl

There are several formulas floating around that are very accurate. The question is, exactly how fast your boat runs now and what is the hp. A 550 HP engine will be very close in performance to a 525EFI or a Raylar setup with headers. Both produce 550+ on the dyno.