spark plug NGK B9EG

The name says it all: racing spark plugs are intended for motorsport use, and their characteristics make them less suitable for road use.
These plugs make a difference when operating permanently in the upper rev range, as is the case in motorsport. In motorsport, durability is not the priority; the focus is on handling high revs, full-throttle speeds and the resulting vibrations that are part of racing.
These plugs are used by works teams, semi-professional teams, engine tuners and in the karting world.
Durability: this is an open-ended question, as it depends on the individual race conditions. Experience has shown that 1–5 races is about right, depending on the racing class.
The plugs are available in different heat ranges and must be selected by an engine builder or tuner to match the engine. Attention: these spark plugs have a long, M14 thread (NGK Type “B”). Most racing cylinders use long M14 threads, but check to ensure the correct size. Racing spark plugs for an extremely strong spark, even with lower-power sources!

NGK Type “B”