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#1
11-19-2003, 11:39 PM
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With distributor connected to manifold vacuum source, where does the vacuum go when you get to part/full throttle? I've been fine tuning my 400 for best feel and I notice that manifold vacuum will not go away unless you really jump on the gas -- then it comes back. If you slowly rev engine to 3000+, vacuum stays?? How does this affect the vacuum advance can? I'm getting slight pinging under part throttle so I figure I need to drop my total Vacuum advance down but was just wondering about manifold vacuum affect on the dist can. Thanks
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#2
11-19-2003, 11:39 PM
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With distributor connected to manifold vacuum source, where does the vacuum go when you get to part/full throttle? I've been fine tuning my 400 for best feel and I notice that manifold vacuum will not go away unless you really jump on the gas -- then it comes back. If you slowly rev engine to 3000+, vacuum stays?? How does this affect the vacuum advance can? I'm getting slight pinging under part throttle so I figure I need to drop my total Vacuum advance down but was just wondering about manifold vacuum affect on the dist can. Thanks
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#3
11-20-2003, 05:22 AM
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At idle, cruise (light throttle) the same amount of vacuum is available under the throttle plates. It will activate the vacuum advance regardless if it is hooked up to a "manifold" or a "ported" source. If you are getting part throttle "ping" reduce the amount of travel in the vacuum advance unit or get an adjustable unit. This assumes that you are happy with the current initial and total timing settings being provided by the mechanica advance.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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