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Author Topic:   swap meet carb help
Donnie Ross
Dirt Maniac

Total posts: 109
posted March 10, 2003 07:02 PM
bought a swap meet alky carb,fired car up ran great just had no secondary pump shot,rebuilt it found floats csrewed all the way down.set level to holley specs i.e trickle out sight plugs at 3 psi now floods like crazy. it has holes drilled above the jets approx .125 jets are 89s are these to big with the extra holes drilled? i know nothing about running alky and don't want to kill my motor, any help greatly appreciated. P.S visible fuel is not pouring from the boosters at idle as if floats were set to high

KPLugnut
Dirt Freak

Total posts: 408
posted March 10, 2003 08:38 PM
Set the floats down a bit from dribbling out the sight plug holes. Alky doesn't need that much fuel height, but then again, a lot depends also on what floats are in there.
Those auxiliary holes above the jets are a bit large (that's also the old school method of making an alky carb), and the jet size is about right for that size aux hole, so don't worry there.
You didn't mention power valves, or the size of the holes behind them. They should be at least .100" up to a max size of about .120" or so.
So many other things could cause the loading up condition, but that's a start.
If lowering float level a bit doesn't help, then I'd look at the possibility of a stuck needle/seat or even the chance (and I've seen this too many times) that a power valve gasket is misaligned enough to cause a leak.

Hope that helps and let us know.

KPLugnut

andykmod
Dirt Forum Racer

Total posts: 95
posted March 10, 2003 09:33 PM
check the floats for pin holes if they are brass,i had it happen to me.Also check and make sure nothing is stuck in the needle and seat.

Donnie Ross
Dirt Maniac

Total posts: 109
posted March 11, 2003 08:56 PM
thanks guys did change the power valves will check gaskets, just wondered why the float was so low originally car ran great then.

Donnie Ross
Dirt Maniac

Total posts: 109
posted March 11, 2003 08:59 PM
also forgot to ask will float or needle trouble show up as visible flooding i.e fuel pouring out the boosters at idle like a gas carb?

rico 08
Dirt Freak

Total posts: 372
posted March 13, 2003 01:37 PM
You probably have a factory holley alky carb,i've heard these are inherrently rich at idle and lean on top so be careful.

Donnie Ross
Dirt Maniac

Total posts: 109
posted March 13, 2003 08:46 PM
thanks for the help, found diaphragm bad in pump will replace this weekend and go from there.again appreciate the help don,t know didly about alky.

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