"Presently have a 2bbl on a 35
"Presently have a 2bbl on a 351 ford (Merc233).Was the Merc 255 the same only with a 4 bbl?
Next question, If cruising a 3000 rpm would a 4 bbl be running on 2 or 4 venturies?
The reason I`m asking is that almost 10% power increase would make quite a difference pushing my 24 ft Fibreform boat. I was running a 15 1/2x 17 p prop and it was a little slow out of the hole so I switched to a 16x16p and it comes out of the hole great but have lost about 4 mph at cruising speed. Maybe I`m thinking wrong but it seems that having the 4 bbl to give me that extra umph out of the hole would allow me to go back to the 15 1/2 x 17p prop which was easier on gas at cruising speed but if all 4 bbl`s would be open at cruise, I would again lose that economy factor of the prop.
Any opinions welcome.
Tks"
"Presently have a 2bbl on a 351 ford (Merc233).Was the Merc 255 the same only with a 4 bbl?
Next question, If cruising a 3000 rpm would a 4 bbl be running on 2 or 4 venturies?
The reason I`m asking is that almost 10% power increase would make quite a difference pushing my 24 ft Fibreform boat. I was running a 15 1/2x 17 p prop and it was a little slow out of the hole so I switched to a 16x16p and it comes out of the hole great but have lost about 4 mph at cruising speed. Maybe I`m thinking wrong but it seems that having the 4 bbl to give me that extra umph out of the hole would allow me to go back to the 15 1/2 x 17p prop which was easier on gas at cruising speed but if all 4 bbl`s would be open at cruise, I would again lose that economy factor of the prop.
Any opinions welcome.
Tks"
