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problem ignition timing
Posted: 22 Jan 2006, 20:04
by redstar
after sorting advance/retard/vacuum pipes out i finally try to time up my 2000 1981 motor.....
The figures in the haynes lying bible list 4-6 atdc with vac on, which i have done, starts real bad and less top end than before (55 mph before) Any ideas would be most welcome..... i have run out of them!
Posted: 22 Jan 2006, 21:13
by smnbyt
is the vac working?
Posted: 23 Jan 2006, 10:37
by redstar
seems t be, got the strobe on it and the mark moves quite a way... i really am baffled!
Posted: 23 Jan 2006, 10:59
by HarryMann
atdc 
Posted: 23 Jan 2006, 12:56
by redstar
i think so.... the timing scale has got the 0 on it , i presume its tdc. i am tuning to the left of that... i suppoose thats right????
Posted: 23 Jan 2006, 13:36
by HarryMann
sure it shouldn't be btdc ?
whichever way the rotor arm turns, rotate the dizzy the other way to advance, about 3-4 degrees should do for starters and see if that helps. Be aware of any pinking and back off if so..
Posted: 23 Jan 2006, 16:49
by redstar
thanks harry... will 'have a play' when its less artic outside... will let you know...cheers
Posted: 26 Jan 2006, 10:45
by redstar
Cheers harry, its a bit better, try and keep it going till spring and look harder then.. cheers again!
Posted: 26 Jan 2006, 11:01
by HarryMann
Good, but a tip
If you're fine tuning it 'by ear/seat of pants'...
Don't just change it and run up road, as long as its not obviously over-retarded or over-advanced, both potentially harmful then...
run for a few days, get the feel of it under a variety for driving conditions, and only then change it to another known setting, say slightly advance it, and don't pre-jusge the change until you've savoured it for a few days, and if it seems Ok, a week or so. Keep the dizzy well marked up, accurately scribed. Don't assume more advance is always better at the top-end, it's not, some engines might not pink or detonate, but still hate being over advanced.