Marine carbs have no vac lines?

[wicked_tahiti]

hay guys... i was looking into setting up the vacuum to the advance on the distrib. However when reading through some posts on hotboats i noticed that alot of people dont even have vacuum ports on the marine carbs..

Does this mean there is no need to run the vac advance? not recomended? or what?

Seems to me i would get a bit better fuel econo by using the vac advance since it is available to me.... but maybe there is a reason they dont use them in marine applications...

Any info on this would be great...


BTW - the boat is running and ready, we may go out later today since its turning out nice.. however the weather man told us bad weather.... what a lier!!!!!:chainsaw:

[hkunz]

I've heard that as well, but I'm running a vacuum line on my marine carb (Holley) in my Tahiti jet. Is that the right thing to do? I dunno, but it has been working great like that since '98. Of all the problems I've had with the boat, none are related to the carb or ignition timing.

[wicked_tahiti]

Your holly marine carb has a vac port? full time or ported?

Im really not sure if there is a reason that the EDLBRK carb has no vac lines unless they suspect we run distribs without vac advance. I can see the lack of aditional lines seeing as we have no extra components to run, but im not sure....


Im still wondering, what vac line i connect the distrib to, if i where to run it... full time or ported?... also if i choose not to run them, do i plug them up? or leave them open?

Any advace again would be great, i believe the both of us need it.

[kimswang]

Stock marine distributors use weights, not vacum, for timing advance.

[wicked_tahiti]

well that answers that question...

at least we know that marine applications do have an advance.

[hACk]

Marine dist do have an advance, just not one that controled by vacuum, The HEI systems are great and easy to wire up, one hot in crank position wire and a tach wire, well thats GM's HEI set up.

[hkunz]

My HEI is a car version, they didn't make marine type when I built the boat. I run the vac advance to the manifold runner. Should I disable that, and if I do, should i try to get more advance out of the mechanical advance?

Oh, and I just got it running today! Sounds great, very strong, 50 PSI at idle.