E3.109 is a 14mm, 0.708” reach plug with a 5/8” hex and a taper seat.
It is built to have a cold heat range, non-resistor, and is used a
variety of racing applications. E3.109 is a similar to E3.108, but has
its own heat range, and has a projected core nose. E3 racing plugs are
fitted with its patented DiamondFIRE ground electrode, which is secured
with two legs to the shell. This allows for excellent heat transfer, and
provides additional stability to the side wire in these high RPM
engines. The unique DiamondFIRE ground electrode is proven to increase
power, reduce fuel consumption and improve hydrocarbon emissions in
long-term use. The E3 ground electrode and full-size center electrode
also provides optimal performance over an extended product life.
CROSS-REFERENCE
Autolite AR93, AR94
Champion 280, 685, S59YC, S61YC
NGK 7891, R5724-9
