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Author Topic:   vacuum secondary?
Dirt Maniac

Total posts: 106
posted April 04, 2002 11:06 AM
Just curious as to whether anyone has tried a vacuum secondary carb like a holley 750 on a modified?

The idea is that on a real dry track maybe it would make the car easier to drive because the carb would only feed the engine what it needed under load and not pour on the power and break the tires loose like a mechanical.

Just a thought.

Maybe I need to dig out that q-jet?

Dirt Maniac

Total posts: 178
posted April 04, 2002 12:12 PM
I read an article on this lately but can't find it it stated exactly what you said that you could set the vac. so you could come out of the corner and be set when it comes up to full power if I can find it I'll post it

Dirt Freak

Total posts: 242
posted April 04, 2002 01:54 PM
I run a vac sec almost exclusively on a dry slick track, works wonders especially on a big cube motor. Its not up to par on a heavy track because they only have one accel pump, but on a dry slick track you can't beat it. The key is having one that is pro-built for oval cars on alcohol. Several manufacturers build them and they are designed to be easily adjustable to track conditions.
I still run a mech carb when the track still has grip because the vac sec just isn't responsive enough.
C&S builds them for about $1200 they are the best one that i have tried. I have run it for about 5 years now and was the best money i ever spent.

Dirt Full Roller

Total posts: 37
posted April 04, 2002 06:18 PM
I've been running a vac. for three years and I think its great. I use a holley hp

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