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thechuckster
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Location:
Brisbane
Registered:
February 2003

Re: mulit coil vs distributor setup

Mon, 01 August 2005 08:27

Chris Davey wrote on Mon, 01 August 2005 11:43

Just one thing, what about a waste spark setup with a CDI? I assume this sits somewhere in between waste spark and multi coil CDI. Good enough for most systems?

it strikes a healthy comprimise between spark power (CDI gives strong spark and some systems will control spark duration and decent multiple-spark-events depending on rpm or load or ... etc) and waste-spark needs fewer ignition events to monitor (and hence syncronise with) and has simpler wiring & software to drive the less-complex hardware.

two other advantages of waste-spark systems are: cleaning of spark plug gap (arcing during post-combustion period reduced crap build-up in gap area) and assisted burning of post-combustion gases (e.g. left-over material is ignited or assisted in completion of burning) - this helps reduce overall emissions output from the engine, particularly when under load.

The design of some waste-spark systems also give you slightly better reliability and fail-over. The holden triple-coil-pack seen on most V6's and the US/euro EDIS systems have their own crank-pickup and can continue to run (in a limp-home mode) if the ECU stops telling it how much advance to include in any spark timing. Same applies for some of the early VAST toyota systems.

weird but true: if you have a relative/aquaintance/family member who has a pacemaker and is also universally disliked (e.g. a wanker) ... give them a good zap with a CDI ignition system - the voltages they pump out would give some digital heart-helpers a nasty whack and if you're lucky, turn them off Evil or Very Mad

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