Spark Plug Question
I have a several of NGK CR9EK plugs that I bought for a vehicle that I don't have anymore. My current vechicle uses CR9E. I see there are 2 major physial differences between these two plugs:
1). CR9EK electrode end extends about 1~2 mm deeper into the cylinder.
2). CR9EK has dual electrodes.
If I use CR9EK, on an engine that uses CR9E, would it cause any harm, such as detonation or anything?
I am fairly certain that the piston would not hit the longer CR9EK because the head of the engine is dome shaped and there is enough clearance for that extra 1~2 mm.
How about, would I benefit any using the longer CR9EK plugs?