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Addition of vacuum advance???

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G Taylor

01-08-2002 07:19:39




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Has anyone experimented with the addition of vacuum advance on two cylinder gas tractors with distributers? A question from a theroretical standpoint to improve response,idle, fuel efficiency & reduce plug fouling in parade tractors. Are there Delco components that will "bolt on"?




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Clooney

01-08-2002 16:45:06




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 Re: addition of vacuum advance??? in reply to G Taylor , 01-08-2002 07:19:39  
~Glen, I'm not sure a vacuum advance will gain much on a low RPM high torque tractor engine. The 2 cylinder power pulses would drive the vacuum diaphragm crazy at low throttle settings. ~Due to the torquey nature of the engine the vacuum would remain pretty high even under load & the engine RPM remains fairly constant even under load. ~A vacuum advance works at it's best with fast load changes such as shifting, & quick throttle plate opening changes such as launchings & passing.
~It probably wouldn't help fuel economy as it would have to allow the spark advance to end up at the same setting as the mechanical advance does now under load, it would allow more spark to be used at low load & low throttle settings but that is the place a 2 cylinder gets kind of weird in the intake pulse areas due to it's 180*-540* firing order so calibration would be hard to do & spark scatter would probably be a problem. ~Extra spark at low RPM doesn't necessarily help the idle equality either, as more spark is added at low engine speeds (no load) it usually means less throttle plate opening & in some DLTX carbs that can richen the mixture due to air flow & idle circuit calibration.
~The typical older J.D. distributor (I don't know about the newer numbered series) tend to drop the under 300 RPM timing to 2* for starting purposes & if a vacuum advance added spark advance during higher vacuum (the purpose of a vacuum advance) it would add advance while starting if the choke is closed creating a high vacuum in the intake system.
~I think it would be difficult on a stock distributor because of the fixed breaker plate but could probably be done electronically with a small computer a MAP sensor & electronic ignition.

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Mike Aylward

01-08-2002 15:52:46




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 Re: addition of vacuum advance??? in reply to G Taylor , 01-08-2002 07:19:39  
Glen, that is an interesting question. While we are on theory, do you suppose the vacuum level would be constant enough to activate a vacuum advance in a steady fashion? Something to ponder. Mike



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