Posted by John T on March 03, 2013 at 05:33:40 from (71.54.160.151):
In Reply to: 1944 B Timing posted by Jndrgreen on March 02, 2013 at 21:20:02:
For best starting, especially hand crankers, she needs to snap impulse right at TDC, if before she kicks back if after startigns not as good. If the flywheels on the right spline, cam to crank are in time, governor to cam is in time, when the Flywheels Left Hand Impulse is at 3 o clock (left piston at TDC) the open female drive slot in govenor shaft end where mag mates should be flat horizontal fore n aft......
When all was new and in time and the mags lag angle n points were all correct, the mag would be pretty well straight up in the middle of its adjustment window at that time.
If you loosen the bolts and rotate the mag forward CW that retards BOTH the start impulse as well as the run timing. Rotate it backwards CCW it advances BOTH. When you loosen the 4 screws on the mags rear and adjust the lag angle that affects start impule timing ONLY no affect on run time advance.
I first set the rear lag angle and fine tune by mag rotation till she snaps at TDC (LHI at 3 o clock by mark) then use a timing light and as long as she runs from 20 to 30 advance I let her go. My friend the late Duane Larson set the run time EXACTLY where he wanted it then kept adjustign teh lag angle till she snapped at TDC.
If you first set the mag full retard CW,,,,,,,slowly turn flywheel to LHI 3 o clock and stop,,,,,,,,,,slowly turn mag advance CCW till she snaps, thats fairly close to correct snap impulse timing........
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