Many, many years ago there was a spark plug sold that was a surface gap plug
(NO side electrodes projecting). These things worked great-they didn't improve
mileage or cut misfires or anything like that (they were advertised as solving
just about everything!), what they DID do was last 3 to 5 times longer then a
regular plug and solved pinging problems on engines that tended to have that
problem (most Rotes 4 cylinder!). I used them in most of my Rootes cars during
the sixties and early seventies and then they disappeared from the market. So I
would guess that a split fire plug would last longer then a regular plug. I
would also guess that a platinum tip plug might not last longer in an old
engine because the old engines burn much dirtier then new ones and leave all
sorts of crap on the plugs.
Jan
Jay_Laifman@countrywide.com wrote:
> Bill writes:
>My question is what spark
>plug gap can I run on my split fire spark plugs.
I don't know if you've noticed on the Tiger group, but there was a thread
just the other day with multiple people telling a Tiger owner with problems
to immediately ditch the splitfires. "Snake oil", "marketing gimmick" and
"garbage" were the most common words used. I'd suggest going back to the
standard N9YC's and starting from there.
As long as we are also on the subject, I've also been told that the
platinum plugs are no good for our age cars. I've seen proof of it too.
I do have a set of N7YC's that I was going to try, but I've found the temp
range of the N9's just fine.
Jay
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