Quote:
Originally Posted by DoubleL
Thanks for your input in advance guys.
I have a new HEI with the coil in the cap. It has full 12 volt power.
I set the timing at 4 degrees advanced with vac advance plugged but when I reconnected it the timing jumped and advanced past the "A" setting on the indicator. It probably advanced 16-18 degrees when I plugged it in. I ended up lowering the timing to "0" so it wouldn't advance so much. The truck idles and revs great but totally falls on it's face going up hills.
What should I set the initial timing to? What should it jump to when I hook up the advance. I have the advance hooked to a port on the manifold is this right?
Any advice would be appreciated. Also it has been verified that the timing mark is correct at TDC.
Thanks guys!!!
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Hope others will chime in; but iirc, at least on
newer v-8's, timing is set on HEI's with the
vac adv hooked to an
unported source from our carbs--meaning pulling even at idle. [The modules have increased and decreased 'dwell-curves' built in, which changes timing as dwell changes.]
Sounds like your timing is
retarded due to being set on
zero w/adv unhooked and plugged. Maybe set it
just as you did, except on 4 deg; then up it to as much as 8 degrees, test-driving up those hills at each setting again--over-looking what it jumps to when you re-hook vac. If it ever 'kicks back' on your starter, or if it spark-knocks, lower your setting gradually until that stops. You may also benefit from connecting your vac to a 'ported'(not pulling until throttle is opened) source on your carb.
Your HEI possibly needs a re-curve kit, some which decrease overall advance-swing; but I wouldn't consider one until I tried these suggestions first. What brand/year is it built for?
HTH,
sam