holley 600 vac sec
Thread Starter
Racer
Joined: Jul 2003
Posts: 401
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From: texas,, at last
holley 600 vac sec
guys,
how can i find out if the vac secs are opening properly on my holley 600???????
it seems to bog down when i stop on it pretty hard from rest,
i suppose i could disconnect the rod and see if it felt different,
possibly put some talcum powder or something on the secondary butterflys and see if it's washed off,
anyone got any better ideas though???
it's a brand new carb, it was only on my camaro for a few miles,
neil
how can i find out if the vac secs are opening properly on my holley 600???????
it seems to bog down when i stop on it pretty hard from rest,
i suppose i could disconnect the rod and see if it felt different,
possibly put some talcum powder or something on the secondary butterflys and see if it's washed off,
anyone got any better ideas though???
it's a brand new carb, it was only on my camaro for a few miles,
neil
Crackin' on...
Joined: Jun 2003
Posts: 9,436
Likes: 124
From: Somewhere in Tucson AZ
St. Jude Donor '09
Re: holley 600 vac sec (camaroneil)
I'm definitely no carb expert, but what size shot is your accelerator pump? Usually, the stock Holley's ship with the 30cc pump shot, and most of the tuners I've ever met, almost always put the 50cc pump shot in right away.
hth
hth
Tech Contributor
Joined: Aug 1999
Posts: 14,377
Likes: 6,376
From: At my Bar drinking and wrenching in Lafayette Colorado
Re: holley 600 vac sec (camaroneil)
Put a paper clip on the vacuum rod right up against the vacuum housing. Take the car out and run it up through redline at wide open throttle. Then look so see how far down the shaft the paper clip has moved. This is how far your sec's are opening.
Safety Car
Joined: Aug 2001
Posts: 3,683
Likes: 202
From: Waterford Mi
Re: holley 600 vac sec (camaroneil)
"it seems to bog down when I stop on it pretty hard from rest"
This usually is a sign of not enough fuel when the primaries first open. The secondaries don't open until the rpm's reach high enough to draw them in. I would check that the pump is working properly first, then start playing with the discharge nozzles and cams.
This usually is a sign of not enough fuel when the primaries first open. The secondaries don't open until the rpm's reach high enough to draw them in. I would check that the pump is working properly first, then start playing with the discharge nozzles and cams.
