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Author Topic:   Carb Problems...I think
Dixon
Member
posted July 16, 2003 11:28 AM
I've got a 355 c.i. SBC in an '80 Camaro. I have a 650 cfm holley double pumper that loads up real bad on idle, then runs lean. I can't keep the engine from missing when I stomp the gas off the corner almost all the way down the straight. The jets are 68 front, 72 rear. I have modified 487 heads and a hydraulic cam that has .512" lift and approx. 305 advertised duration. The intake is a performer RPM with a 1" spacer. I know I should probably run larger jets, but the way it runs rich at low speeds is difficult to tune with. I'm not allowed to run a double pumper in my class, but I'm not up front so it doesn't matter.
I tried switching to a vacuum secondary carb with larger jets that worked fine on another motor. It runs better off the corner, but not great. It still wants to load up on idle too.

Does anybody know what could be causing this? I hope it's not a major internal problem.

dirtbuster
Member
posted July 16, 2003 01:02 PM
Did you check power valves to make sure they are good. What is your fuel pressure? Do you have the float level set correctly?


Dixon
Member
posted July 16, 2003 01:52 PM
I changed the power valve, even though the old one looked fine. I have set, and reset the float levels several times. Maybe I'm just not experienced with this, but I've never had this much trouble.


dirtbuster
Member
posted July 16, 2003 02:19 PM
is it a miss in the ignition or is it a hesitation/bog in the carb?


Dixon
Member
posted July 16, 2003 04:16 PM
It's definitely a carb problem, or something other than ignition.


Gene
Member
posted July 16, 2003 06:08 PM
My guess is your float(s) have crack in the solder joint. After the thing sets they drain, when you fire up they fill with fuel, aint staying where you've set 'em.


rico 08
Member
posted July 16, 2003 06:44 PM
Those jets are too small,i run 71 front and 82 rear.


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