I hate to keep beating this drum, but if you can walk into an Autozone and
buy it, you shouldn't.
The heat range is too high. Street plugs have nose temps high enough to
keep crap burned off at idle speed and 2,000 RPM light throttle. Once you are at
WOT for more than a few minutes that street plug is too hot. You get cement boil
around the center post. You manufacture a glow plug and loose control of
ignition advance.
The NGK dash 10s are closer to ideal. the dash 11.5 is what racers use.
Crosses to the dash 10s are also used in racing. Cheaper racers use Autolite
AR2592. Special order from your friendly parts house. The last ones I bought
were $7.00 for 4 plugs. Next day delivery. If you live near a circle track they
may stock a few boxes. Air cooled dirt bikes use similar heat ranges.
Use inductive plug wires to kill off radio noise. Keep plug wires as short
as is possible. Plug wires must touch nothing that is grounded.
Lynn E. Hanover
Incinerating rotary
engines since 1980.
In a message dated 10/8/2012 10:26:43 A.M. Eastern Daylight Time,
echristley@att.net writes:
David,
Thank you for the compliment.
I have installed a set of the -10 spark plugs and at this point they are
long past the time where the stock plugs normally needed to be replaced. How
long they will continue to work is unknown, but at least that one data point
is consistent with the study and
encouraging.