Re: [DMCForum] Another spark advance question
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Re: [DMCForum] Another spark advance question



Huh ? What ? Do you want us to disconnect our vacuum advance system
because
you don't get it right ?

Why should it be timed at full vacuum ?
As soon as the throttle plates open, the solenoid will let vacuum suck the
diaphragm.
But also as soon as the plates open the vacuum will be reduced !
With rising rpm, the vacuum will rise, too.

Don't mess with a running system, I guess JZD and the engineers did this
because 
they had a reson to do it. 

Elvis

> OK Martin:
> 
> Stock DeLo shoots full vacuum to spark advance as soon as throttle
> plates open. If cut off solenoid is holding this, means car is timed
> at full vacuum. What happens THEN as RPM's increase and vacuum drops?
> 
> Yes, I know there's centrifugal advance too, but seems to defeat
> purpose of any advance at all. Centrifugal advance is moving rotor one
> direction at same time vacuum advance is relaxing it the other.
> 
> If this is truly what JZD intended, seems an owner would actually be
> better off disconnecting vacuum diaphragm altogether and simply
> letting mechanical advance do it all.
> 
> Bill Robertson
> #5939

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