>Re J2 running with cap off:
[...]
>ready to fire. Apparently, I was getting spark to follow the path of least
>resistance at the right times. This might be explained by the presence of
>fuel/air mixture in the about-to-fire cylinder, thus lowering the resistance
>in that cylinder and causing the correct plug to fire.
Perhaps all cylinders were getting spark each time. Imagine the spark timing--
1) TDC compression -- good spark
2) BDC power -- only spent gases, so no effect
3) TDC exhaust -- similar to 2
4) BDC intake -- could cause firing, but uncompressed mixture is less prone
to ignition than compressed. Further, as Lew pointed out, more spark
energy would go into the compressed cylinder due to its lowered resistance.
The current wave of distributorless ignitions fires the plugs at every TDC,
so it requires two coils for a 4 cylinder, for example. It's amazing that
it wasn't done sooner... sf
Stan Fickes If you want safe speed--buy safe speed--MG.
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Apple Computer, Inc. 1951 MGTD, under restoration
(408) 974-7653 1965 Sprite, daily commuter
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