[southwind011]

750 or 850 holly on a mild/stock bbc? and double pumper or vac secondary's

 

[W.O.T]

750 double pumper.

 

[EVILFORCE]

Ya. What he said.

 

[southwind011]

how will it run with the pumper compared to the vac sec. will it change my fuel mileage

 

[FastRat]

how will it run with the pumper compared to the vac sec. will it change my fuel mileage

it will run "great" & if u stay out of the secondary's, ur fuel mileage should be the same...also...if u upgrade the motor in the future, u will have a good carb to work with...many more things u can do to it than a vac sec carb...just my .02 cents

FastRat

 

[sleekvino]

you should never run a vac carb on a jet boat. why would you!

 

[southwind011]

you should never run a vac carb on a jet boat. why would you!

its what was on the boat when i got it. just so i know why should you not run a vac carb on a jet boat

 

[CK7684]

I have a 750 with vacuum secondaries on mine and it works just fine. Vac vs mech is really driver preference. It can be argued that mech sec offer more driver control, but being a jet, the load is pretty much the same at a given rpm, so the sec vac diaphram could be set the where you want them to kick in. Mine open at 4000 rpm like clockwork...

My .02

 

[GT Jets]

you should never run a vac carb on a jet boat. why would you!

Why? Or perhaps a better question, why not? Wanting to start a conversation based on opinions is all...

Vacuum secondary carbs work killer on pleasure/cruiser type boats IMHO.

GT hand

 

[SmokinLowriderSS]

750 is a fine size for a 450-460" motor not turning past about 5500RPM.

You CAN run a vac. sec. carb on a jet boat just fine. You won't wring every last drop of maximum performance out of it, but, properly adjusted you don't loose very much.

Mileage will be similar, IF YOU KEEP YOUR FOOT OUT OF THE SECCONDARIES ON THE Double Pumper.
If you don't, oh well.

 

[jetboatperformance]

750 DF DP (Holley or Holley clone) and give it plenty of fuel volume

 

[HammerDown]

you should never run a vac carb on a jet boat. why would you!

My little 715 vac secondary on this 468 works great on my Jet! Throttle response is almost like FI devil