4.3 carb

[warrenp]

sorry this isn't exactly a z question but it gm related

 

my boat has a 98' mercruiser 4.3 vortec in it.

and my 4bbl has a hard time kicking in sometimes.

it came with a webber 4bbl it's excactly the same as a edelbrock 4bbl.

 

any way i saw in summit racing they have a small section on boat proformance. but the smallet carb they have listed is a 600cfm.

 

how do i know if this would be to big for my application?

or just right?

[SuperDan]

This should give you a rough idea.

 

http://www.4secondsflat.com/Carb_CFM_Calculator.html

[Mike C]

I put the Edelbrock Marine 750 on my 5.7 liter Mercruiser and am very pleased. The 750 is 25% bigger than the 600 and the 5.7 is 32% bigger than the 4.3. I think you will be fine with the 600. They sell those marine carbs remanufactured. Shop around and you might be able to save big bucks. Mine was a reman, from Jeg's I think.

[warrenp]

i was being a bit anal about this and just want a brand new unit.

 

the money doesn't matter. i use my boat for work and can't affored to break down when the seasion starts. 1 day COULD cost me twards $2,000

 

i was thinking maybe some rooler rockers too?

 

she does 40+ now if i can get over 50 i'll be happy.

the boat the beat me in the lobster boat races last year was doing 46

if i can clear 53 i'll have the fastest boat-a-float for a lobster boat.

 

the fastest was a boat called wild wild west. he had built 502 SC

backed my a 2 speed power glid in a full size traditional style boat 32' long

 

i have a 24' plining hull unlike a displacment hull of the true lobster boat style.

[Mike C]

Sounds awesome! My boat is an inboard ski boat. Top speed is about 48 mph. But it gets there quick! As you note, having to move a lot of water with the hull is a big penalty.

 

The rebuilt carbs have same warranty as new. IME, remanufactured products seem to have fewer failure rates when I buy them. I assume this is because they are actually tested rather than boxed and sent out.