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mrshin
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Montrose, VIC
Registered:
May 2002

Re: mulit coil vs distributor setup	Sat, 30 July 2005 07:55

There is no 'best' igniton setup. Points: forget under any circumstance, even lawnmowers give trouble with them. Single coil HEI: (dizzy) used on many cars, and adequate for most jobs Single coil CDI: Often used when HEI is no longer able to keep up due to RPM, or boost/nitrous/etc. 'blowing out the spark' - has the disadvantages of short duration spark (not great for emissions/light load, lower RPM), and high voltages making plug leads, dizzy caps etc. susceptable to leaking/cross firing Waste spark: used by people who can't afford an ECU with the full number of ignition channels Multi coil HEI: With adequate coils, and maybe a voltage booster, will keep up with almost anything people can dream up, provided the hardware is good. Some OE coils can tend to be a bit weak for those looking for triple the power, so people sometimes say these systems 'must be crap' Multi coil CDI: Useful for the 35+psi, 9000+rpm lovers, but with the disadvantage of short spark duration still. Top fuel ignition systems are done a different way altogether. One reason for this is redundancy - from what I understand, with the physical volume of liquid that runs through these engines (due to use of nitromethane), if the ignition actaully fails to fire once, they will hydraulic lock, in a relatively spectacular fashion [Report message to a moderator]

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