Reading back through the archives (as I do before changing ANYTHING on
my car), I was looking for some comment on the increased gap recommended
when you install a Lucas Sports Coil. Everyone says 'increase the gap'
but I was seeking something more definitive and found the following from
wayyyyyy back. Any comments anyone?
Way back in history, MGBob said:
>
> Date: 08-Jul-1997 08:24:06
> Subject: Re: Reading Spark Plugs
>
> Addressing the Sports Coil idea, at the GOF Newton sports coils
> were mentioned. In the discussion, it was stated that a rule-of-
> thumb for spark plug gap is .001" per M volts. Since the standard
> Lucas coil delivers about 22-25M volts, depending on incoming
> voltage, the spark plugs should be gapped at .025. The Lucas
> sports coil delivers about 40M volts, so the plugs should be gapped
> at .040 to utilise the extra power. This was new to me, but it was
> then explained that Champion and NGK make plugs called "large gap"
> or something similar, that are especially configured for the extra
> gap and extra voltage. One might wish to check clearance between
> plug and piston if compression has been increased.
> Bob
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