Re: Repower I/O Qs.
 

Chevy 250, in a boat puts out 165 HP at the motor, from a different came then stock, same motor in car gets 140 hp.
I believe that at the prop this is about 130 or so?? I forgot.
WOT on a cuddy 5000 rpm will get you low 30's But will rode nice in the mid 20's

Thats what I had when I got my boat, I have converted to outboard now by bracket and a 175 hp, I get wot 5500, 40 mph (light load) Ride around all day low 30's

I run 15 X15 1/4 prop on both the I/O and OB, gives me best out of hole with heavy loads, 3 guys + gas + 200 # fish, 100# ice

thats whats best for me.

Re: Repower I/O Qs.
 

that six runs much better proped at 4000 to 4400 rpm

GMC. my point was that without rpm information, horsepower ratings can be missleading
A couple of years ago, Mercruiser introduced the 5.0 MPI rated at 260 Hp at the prop, they were claiming it would do the same as a 5.7 carb, what they neglected to point out was the 5.0 needed to turn 4800 to 5200 rpm to make power( it had a peaky hp curve), while the 5.7 only had to turn 4400 to 4800 to make the same power. the 5.0 would run faster than the 5.7 in a light boat( checked it myself), but put the two in a medium to heavy boat, the 5.7 walked all over the 5.0, it wasn't even close, with out the torque curve referenced to rpm, most people wouold assume the 5.0 would do the same job(thats what they were telling the salesmen, who were telling the same to the customers).

Re: Repower I/O Qs.
 

Before the motor went...it'd go 40 mph tops. I usually ran it about 30. I expect the same performance with the new motor. It's turning a 19" SS prop.

A 5.7 sure would'a been nice tho'. :D

Re: Repower I/O Qs.
 

a 5.7 would have been nice, but if it will make you feel better, remind yourself that it would have taken a new inner transom plate, might as well replace the outer transom plate, you would have had to find the correct y-pipe, and you know it would be a shame to bolt up an old drive so might as well...when you're done it only cost you $$$$$$$$$$$$$

Re: Repower I/O Qs.
 

Good luck with that new block. Id have gone the same way,less stuff ta change!

Re: Repower I/O Qs.
 

The boat being a '77...and NOW my wife wants us to move to the North Carolina MOUNTAINS !!!!! aacckkk.
( she's skeered of hurricanes ) ::) If I sell it it'll go eaiser at less a loss with less money dumped in it.

If the move happens...I'll list it here first. I'll hang onto the lil'Bonita for lake use up there...or if the river rises during a Hurricane. (There's Nooo escape) ;D

Re: Repower I/O Qs.
 

tell her that Hugo travel North West after making landfall in Charleston, SC, went right up thru Charlotte, NC, then skirted the NC mountains before turning back North East

Re: Repower I/O Qs.
 

Big diff is the winds get cut way down by the mountains. We hava place in Hendersonville and are all too aware of the hassle of rising rivers and creeks. The French Broad River rose about 15 ft high in the early 90s it washed thru Chimney Rock.

Re: Repower I/O Qs.
 

in 89 someone took my inline out and repowered with a 4.3 V6 vortek it has got plenty of power good on gas

Re: Repower I/O Qs.
 

If you move to H-ville you should keep the V to use on the lakes along SC Hwy 11 fishin for stripers with REEL.