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08-14-2017, 03:25 PM | #1 |
Senior Member
Join Date: May 2010
Location: Cape Cod
Posts: 1,128
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GAV Correct Setting ?
Group,
A well worn subject, but slightly different. I have found that the idle performance on my car (rebuilt Zenith in the past) is good with the GAV out 3/4 turn after it "warms up". I do not have a thermostat in the car at the present time. The engine temp is around 150 F. I have tried many different settings on the idle mixture screw, but at the present time the best is with the mixture screw out about 2 turns and the GAV open about 3/4 turn. With this setting, the car runs well, good "pep" and doesn't stall at idle from a running at speed. With the GAV closed, I get pops from the carburetor with foot off the throttle and stalls after coming to a stop. Most instructions say that the GAV should be 1/4 to closed after warmed up...so...my question is : 1. Would a thermostat bring up the temp so that a "standard" GAV setting is used ? 2. Do I even have a problem ? 3. Is the idle part of my Zenith in need of cleaning ? Marc |
08-14-2017, 04:04 PM | #2 |
Senior Member
Join Date: Oct 2015
Location: Bay City Michigan
Posts: 1,050
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Re: GAV Correct Setting ?
on my car its a tilly but similar concepts. I get pops on acceleration if I have my gav closed. I have read that the gav is full open at 1 turn out. and any turning beyond that is the same as 1 turn out. I take mine full out for starting. it will smell rich in the exhaust. I would suggest taking off the carb and really blasting out passages with carb cleaner and compressed air. Wear safety glasses. I say that because im stubborn about putting them on and get a blast of cleaner at my face nearly every time then put on the glasses. With the stalling at stops your mixture screw on the side of the carb could probably come out a bit. Or also dirt or debris causing less fuel flow.
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08-14-2017, 04:41 PM | #3 |
Senior Member
Join Date: May 2010
Location: Long Island, NY
Posts: 3,466
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Re: GAV Correct Setting ?
My practice is to set the GAV 1/8th of turn open, get the engine to operating temperature and then make carburetor adjustments. The only time I turn the GAV OFF is when cruising at highway speeds for long distances on flat roadway and over 45 mph.
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Bob Bidonde |
08-14-2017, 04:51 PM | #4 |
Senior Member
Join Date: May 2010
Location: Mansfield, Ohio
Posts: 408
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Re: GAV Correct Setting ?
Does your car run better that way or do you get better gas mileage by doing that.
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08-14-2017, 04:56 PM | #5 | |
Senior Member
Join Date: May 2010
Location: Mansfield, Ohio
Posts: 408
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Re: GAV Correct Setting ?
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