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Author Topic:   holley 4412 ?
34Racing
Member
posted February 07, 2003 07:30 PM
Throw away the stock filter in the bowl and put a good inline filter on. The stock filter won't flow enough for racing. As for the squirter size you'll have to see what works best. Believe it or not I've got a 21 squirter on my 4412 and it has worked the best for me.


KPLugnut
Member
posted February 07, 2003 09:17 PM
Yes, that is correct, the only use for that small filter in the fuel inlet is for street use. And even then....

Squirter size will vary a bit, but generally, .028, .025, or .021 are very often found to be what keeps the carb crisp and responsive.
There's so much more, too. Pump cam, pump shot volume, idle circuit setup, power valve tuning, etc, just to name a few.

Hope that helps,
KPLugnut


34Racing
Member
posted February 08, 2003 04:16 PM
Yes, the spring, diaphram, pump housing, screws, and the pump arm as well as the pump cam are all different between the 50cc and the 30cc pump.
What many guys are doing is simply replacing the larger, more agressive 50cc pump cams with the smaller more mild ones typically used on the 30cc pumps.
What that does is the 50cc pump will then only discharge something slightly less than 30cc, just like it would if you had the full 30cc pump kit on it. It's sometimes more difficult to adjust the 50cc pump arms to do this, but it can be done.
Hope that helps,

KPLugnut


34Racing
Member
posted February 09, 2003 04:05 PM
Hey KPLugnut,
Thanks for the help! I think I'll just try and change the cam on the 50cc instead of getting the whole 30cc pump kit. Sounds like you end up with the same results either way you go.
Thanks again. 34Racing


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