The BP7ES plug is for higher compression engine that should have a colder spark plug. The engineers explain that it has to do with flame temperature and overheating the plug. I know from experience that my race engine will melt a street plug! Choose from the following NGK plugs:
This is the NGK spark plug that not only has a wide range of applications, 850cc to 1275cc+, but also a very wide heat range. This is an ideal plug for all street applications. also fits the Sprite , MG Midget , and Morris Minor.
The following article was originally found on the NGK web site here. Spark plugs are one of the most misunderstood components of an engine. Numerous questions have surfaced over the years, leaving many people confused. This guide was designed to assist the technician, hobbyist, or race mechani...