Drag Racing Discussions > Front Engine Dragsters

Perplexed

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jspell:
I've been struggling with a problem for a month need some help...Engine came off the dyno running great idling great.  Put it in the dragster engine won't idle clean.  Three differences: the dyno has a 7AL-2 ignition setup, collector style headers, and a different fuel system.  Engine is a 15 to 1 SBC with HFE intake and a dominator.  The dragster has a new Mallory HyFire 7C ignition and zoomie headers.  I'm starting to question whether zoomie headers may be a problem on a carbureted gas application?  or maybe the new ignition has an issue?  any thoughts???

dreracecar:
Zoomies should not be the. cause a problem. How good is the battery?? Is the fuel pump taking away power needed to run the ignition system? Anytime one runs any style standard ign system (not magneto) with a box (msd,hy-fire. etc) you need to run an altenator to keep the volts up

Paul New:

--- Quote from: dreracecar on December 26, 2014, 06:23:01 PM ---Zoomies should not be the. cause a problem. How good is the battery?? Is the fuel pump taking away power needed to run the ignition system? Anytime one runs any style standard ign system (not magneto) with a box (msd,hy-fire. etc) you need to run an altenator to keep the volts up

--- End quote ---

Ditto!

Totally T:
Im with Bruce...Check the Voltage to the ignition and make sure the pump is functioning like it should. If you suspect voltage to be a issue, stick the charger on it and try it to see what happens.

I do not know alot about the Mallory but I do know it has a start retard on the timing and it also has 3 timing retards on it as well....need to put a timing light on the engine once running to see what its doing for timing.

GlennLever:
Check grounds.

People go so far as to run separate grounds to the heads for the spark plugs.

If the chassis is powder coated make sure the powder (or paint) has been removed at your ground points.

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