Volvo RWD 120-130 Forum

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Hi-Octane? 120-130 1967

posted by  walrus3 on  Tue Aug 31 02:11 CST 2004
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

The centrifugal and vacuum systems on the distributor are totally independent,
since the vacuum advance or retard works on the breaker plate and the
centrifugal advance works on the distributor shaft. However they can cancel
each other's effect, for example if you are going down a steep hill using
engine braking you have a lot of vacuum and also your engine may be going pretty
fast so you would have a lot of centrifugal advance. But the centrifugal
advance is normally at least 20° or usually more and the vacuum retard is normally about 10°.
I guess that the important thing is that at full power you should have
optimum ignition advance. Most people are not unduly concerned about max
power or even efficiency at idle or hard deceleration.
--
George Downs, Bartlesville, Oklahoma, Central US






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New Hi-Octane? [120-130][1967]
posted by  Pooch  on Mon Aug 30 08:16 CST 2004 >


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