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Old 02-16-2010, 03:22 PM
red65mustang red65mustang is offline
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there is next to no gain with the swap if your plugs are dry and light brown using the HEI...

cdi trades more Kv (50) for very very low milli-amps (which is spark heat intensity) and has to have multi spark to not misfire at low rpms..

hei is longggg duration spark event at only around 18Kv with .045 plug gap so there is much higher milli-amps "heat" available to light the fire....

both units operate with about 5amps input so for all practical purposes the spark "joules" are the same....

ya do want cdi with a healthy cam on the street,,,the gas is not getting "atomized" well at low rpms due to the cam,,,the multi spark does insure the fire does get lit...
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