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John T Nordhoff
11-15-2002 21:33:30
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Re: 420T Ignition Problem (Clooney)(long winded story) in reply to Robert, 11-15-2002 18:14:49
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Robert, we have to get back to the basics to figure this out. First, even if you have no distributor cap installed, when the points close and current passes through the coil, but then they are opened interrupting the current flow, high voltage rises at the coils secondary until its high enough to jump a gap. That gap can be the rotor tip to cap terminal gap and/or the plug gap, so first try having the coils output wire (still hooked to coil but out of dist cap, just to within 1/8 inch from frame) separated from the frame about 1/8 inch and see if spining the distributor either way makes a difference. If she fires the same either way, then I sure like clooneys cap alignment theory, since that experiment is independant of any cap at all. If then you use the cap and install a plug wire to near the frame, but it now makes a difference as to direction, I would be taking a hard look at the condition of the cap and rotor. To be safe, I would try a fresh set of plugs also. Besides the orientation of the rotor to cap terminal, other things related to rotation direction giving a different spark could be the rise and fall rates of the cam. Since a semi fouled plug can fire if the voltage is allowed to rise very high instead of bleed off occurring through the fouling medium, a wide cap to rotor gap or misaligned cap to rotor gap (which can be changed depending on direction of rotation) might cause a plug to fire in one rotation direction but not the other. When the points are at highest cam, is when the rotor tip should be near the high voltage terminal. Let us know if the spark test you describe is the same using the cap versus just the coil wire to frame only (capless), and we should be able to narrow down the problem. If you have the August Green Magazine available, my longgggg winded ignition article may help. Good Luck, Ol John T Nordhoff
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