1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Timing advance

Old 03-08-19, 07:34 PM
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Timing advance

13B street port with MSD direct fire ignition. It has Vacum advanced and if I unplug the vacum line and plug up the port when I put the timing light on it the timing continues to climb while I increase the RPMs. Is this correct or why would this happen/
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Old 03-08-19, 08:51 PM
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Mechanical advancers. There is a little spring inside the distributer that moves outward after a certain rpm and advances the ignition.
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Old 03-11-19, 10:25 AM
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At ~4000 rpm full advanced timing should be seen. This is due to the mech timing advance mechanism in the dizzy.
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Old 03-12-19, 10:03 PM
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Thanks for the responses! Being this having Vacum advances I didn't think it also had Mechanical advanced.
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