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01-01-2012, 08:57 PM | #1 |
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Join Date: Feb 2011
Location: Ottawa ON Canada
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8BA Distributor VAcuum
Does any one have typical numbers for the vacuum on the 1953 distributor port? I'm getting about 18.5 in. Hg on the manifold port at idle, and about 2 in. Hg on the distributor port at idle. At moderate PRM (actual RPM unknown) it increases with increasing RPM to a maximum of about 6 in. Hg. I just redid the carb and was wondering if these numbers are in the ball park.
Al |
01-01-2012, 10:01 PM | #2 | |
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Re: 8BA Distributor VAcuum
Quote:
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01-02-2012, 02:33 AM | #3 |
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Location: stratford,ct
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Re: 8BA Distributor VAcuum
Dist vacume is taken off the rear port of the carb NOT the same as intake manifold vacume.Will not work right if your getting dist vac. from manifold. ken ct.
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01-02-2012, 06:55 AM | #4 |
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Re: 8BA Distributor VAcuum
Thanks for the response V8 Bob. Ken ct I realize the diffference between the two ports. I quoted the measured manifold vacuum to determine a reference base line for the distributor port which varies between 2 and about 6 in. HG depending on RPM.
Al |
01-02-2012, 08:16 AM | #5 |
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Re: 8BA Distributor VAcuum
Your post was a little confusing,it appeared you were trying to use manifold vac.My appoligies. ken ct.Happy NY "B Man.
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01-02-2012, 01:46 PM | #6 | |
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Re: 8BA Distributor VAcuum
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Quote:
1/2 degree ( 1 degree advance engine) at .30 in vac gauge 10 1/2 (22 degrees engine) at 3.7 in vac Interesting that all flatheads from 32-53 used approx 11 degrees ( 22 engine) of spark advance . I have found that its very hard to "tune" a decimal point of venturi vacuum. This is not (as the others mentioned) manifold vacuum and depending on the carb may use a external spark control valve as well. More than likely most of these engines just go to max vac when started and the timing stays there ( fixed timing). A mechanical advance unit makes these much easier to tune ... Last edited by BUBBAS IGNITION; 01-02-2012 at 01:51 PM. |
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