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Author Topic:   jets and temp
new8
Member
posted July 18, 2002 09:26 PM
how can i tell when i have my carb jetted right? right now i have 64 in my 4412 2 barrel, and my plugs are a tan color, but my temp goes up to 230 after 20 laps, it seems to have good power but can i get better with bigger jets?
thanks everyone.


mudslinger12
Member
posted July 18, 2002 10:36 PM
when setting jets it depends on altitiude and outside temp. It appears to me that you are running a little to lean, if it is heating up. I will get my plugs like a chocalate brown. That is the way i set them.


KPLugnut
Member
posted July 19, 2002 08:44 AM
I would not go purely by plug color alone in your case. A lot depends, too, on what fuel you are running, timing, altitude, and just about everything else with regard to the engine the carb is on as well.
With such a small jet in a 4412, would you perhaps be running it on a 4 cyl car? That is
the only case where I've seen guys getting away with jets in that range with a 4412 carb.
Let us know a bit more about what your whole package is, and we can help you out the rest of the way with your whole carb setup.

Dayton Umholtz, owner
Kinetic Performance http://www.kineticperformance.net


new8
Member
posted July 19, 2002 02:37 PM
quote:
Originally posted by KPLugnut:
I would not go purely by plug color alone in your case. A lot depends, too, on what fuel you are running, timing, altitude, and just about everything else with regard to the engine the carb is on as well.
With such a small jet in a 4412, would you perhaps be running it on a 4 cyl car? That is
the only case where I've seen guys getting away with jets in that range with a 4412 carb.
Let us know a bit more about what your whole package is, and we can help you out the rest of the way with your whole carb setup.

Dayton Umholtz, owner
Kinetic Performance http://www.kineticperformance.net


it's a 350 running on a 1/4 dirt oval, with rpms at 5500to 7500. any info would be appericated.


KPLugnut
Member
posted July 19, 2002 09:46 PM
I would recommed a 72 jet and a 4.5 power valve as a starting point for your deal. What you have with 64 jets is more like a ticking time bomb there. You're giving up a fair amount of HP, as well as you're destined to burn a piston sooner or later, not to mention the effects of overheating that you're experiencing.
Re-tune your carb after changing it over to flow the amount of fuel that motor should need and I am willing to bet you'll see a gain in power as well as a drop in engine temps.
If you are not sure what to do to the carb, we would be glad to go thru it for you. Quickly, of course, so you don't miss any races.

HOpe that helps,
Dayton Umholtz, owner
Kinetic Performance
Ithaca, NY http://www.kineticperformance.net


markwillson
Member
posted July 26, 2002 08:47 PM
do a ture plug check! starters flag gas off, clutch in ing off, get pushed in. my understandig is no black spec's tan should be sligthly rich but white is very good. white seems to lean to me so we run just tan.4412 we run on 1/4 clay 71 rigth 72 left (drivers) with high flow power valve. check holley.com good LUCK.


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