Heywood ref, Surface gap plugs

[orlin steven jared]

> To the guy who described his 2S Mercury spark plugs: Those sound like
> what I call surface gap plugs. I'd seen ads for them a long time 
> ago, and I've heard they may be used in certain NASCAR teams. Mercury
> 2S motors are pretty high strung things with great specific output,
> but before swapping the plugs into a car, think about about the re-
> quirements of a boat motor vs a car motor, or rather, what does a plug
> have to do in a car that it doesn't have to do in a 2S boat motor?
> idle longer, very low throttle settings, more frequent transients...
> Maybe these plugs behave "colder" than normal plugs?

Surface gap plugs are the coldest plugs you can get.  On the rating
engines at Autolite they can't even be made to pre-ignite.   They
would also foul out pretty quickly after a few cold starts in
a street motor.


Steve