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THEN we have the vacuum advance.. This advance depends on how wide open the throttle is.. IF the throttle is WIDE OPEN the spark will start the fire and the fire will JUMP OUT of the carburetor if this timing occurs.. SO this amount of timing is connected to the vacuum which drops off as the throttle is opened. As the vacuum increases the timing begins to advance with the increased rpm's. So at certain rpm's ALL the timing is working as the vac is sufficient to keep the timing increased.


<img src="/forums/images/graemlins/confused.gif" alt="" /> Okay, Don't know 'bout RAL, but I haven't got my noodle around it. I get the mechanical advance. But if throttle is wide open, rpms go up, would have thought you'd need even more advance. Or is that what lower vac does? So if vac didn't lower, timing wouldn't be fast enough, valve wouldn't be closed, and it would backfire through the carb? Have I kinda sorta understood? <img src="/forums/images/graemlins/baby.gif" alt="" />

97tj, Shaved Ford 9 rear, 4:10's, New 35x12.5 BFG KM2's to test!, Warn x8000i, ARB's, Quick Disco's, Hand Throttle, & it's my DD. smile