Quote:
Originally Posted by SickFinga
Adjusting Value of Firing Point with vacuum at idle: 5 degrees TDC
Test values ignition adjustment with vacuum @ 1500rpm: 11-15 degrees
Test values ignition adjustment with vacuum @ 3000rpm: 18-22 degrees
Vacuum adjustment after retard at idle: 10-14 degrees
Installation value of ignition distributor at starting speed without vacuum: 7 degrees before TDC
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Why anyone would set it I don't know but, at cranking speed, the #1 plug should pulse at 7 degrees before TDC.
At idle, warmed up, vacuum line connected, you should be reading at about 5 degrees BTDC but it might drop to as low as 5 degrees ATDC depending on the emissions requirements for your car.
No vacuum, at idle, engine warmed up should be about 10-14 degrees BTDC.
At 1500 RPMs, vacuum connected, 11-15 degrees BTDC.
At 3000 RPMs, vacuum connected, about 20 degrees BTDC.
Easiest way is to disconnect the vaccum, set at 14 degrees BTDC at idle, rev the engine to 3000 RPMs and set the timing to about 30 degrees BTDC. You might have to give a little on either the 3000 or idle to get the best match-ups between the two settings. You, know, lower the timing at idle a shade to keep from over advancing at 3000 RPM's or vice-versa. Try to get the best even split.