The 6517M Series spark plug adaptor is an offset integral spark plug with a 5-mm access hole for sensor installation. Sized to replace 14-mm spark plugs, eight combinations of performance upgrades are offered in three reaches. Performance upgrades include longer-life electrodes and anti-cold fouling features. Placed in the combustion chamber for high-accuracy measurement, the pressure sensors are installed to complete a testing sequence.
Kistler Instrument Corp., 75 John Glenn Dr., Amherst, NY 14228, FAX (716) 691-5226.