Fast Fred's OMC Mod 50 secrets Thread #2

[Mark75H]

It stands to reason that you prime a KA or KC to inlet valve shut-off, then remove the top and float, that you should be pretty close.

Thanks, that was plan A anyway ... was just hoping someone already knew. My guess would be that the level you see when you remove the top will be slightly lower than it was when the float was pushing the arms and needle up. Maybe I will measure the distance between the mating surface and the follower lever and push the float down to that level and use that fuel height as the over flow.

A return/overflow with a remote electric pump should let me pre-cool the fuel in the tank and have enough volume to keep the gas in the lines and bowls cool without a lot of bulky insulation. I have been concerned that with a regular Merc pump and lines to the carbs you would loose most of your cooling before the gas was used. It might even be possible to stuff the bowls and at the same time insulate the bowl and reduce the volume in the bowl that is not being used and potentially warming up.

[Tim Kurcz]

You've got it Sam. Lot's of flow through a cool can and you can pretty much ice down the intake system. I wouldn't bother with carb insulation - the venturi will take car of that. Just don't be surprised if you ice up carbs & crankcase if you run in humid air near 45F. At that temp, you might actually need warm fuel!

[Mark75H]

45 degrees on the water ... I need insulation

[Tim Kurcz]

Or might that be anti-freeze? LOL!!!

[850cc racer]

interesting how fred has his reg set up.. thats efi style isnt it?
how are you choking her fred? my choke set up is on the return side

i have raced over here in 8 degrees (45f).. yeh its a little cold

[sheuninck]

where do you get a cool can?

[850cc racer]

http://www.jegs.com/i/Mr-Gasket/720/...oductId=745113

i would be making something like that.. coil some aluminium hose/tube but i wouldnt have the holes as they are i'm going to make one with the fuel in the top and out the bottom like that one with it all sealed except the lid, then have a bung in the bottom to drain the water

[Mark75H]

Don't use hose ... it will not conduct the heat from the fuel. Best to use aluminum tubing heating contractors use for gas pilot lines.

Go to a heating supply wholesaler and ask for "3/8 aluminum pilot tubing"

[850cc racer]

aluminium hose/tube- i think thats the aussie slang coming into it.. i edited my post!

[Fast Fred]

last i knew, ya can't run a cool can in any class of SLT, so was not thinkin of that in my set up.

i choke her up with a squeeze bottle, like a Funny car, got to take the hood off,
no choke circuit on there, you should see the look on them couch boat peoples faces at the ramp