Scoop, what makes for a good plug?
I've used various ones over the years the the really expensive ones ( OS ) seemed to blow as quickly as the cheapo ones ( Taylor )......
A good plug ?......One that doesn't blow
A well known racer complained to me recently that he had just blown a plug and was really annoyed as it had only been in the engine for 15 years
I think Ian has already said it......manufacturers are cutting back and the element quality is not so good (probably not as much platignum in the coil) these days.
It really boils down to using the right plug grade for the right nitro content, of course every manufacturer has their 'own' grading/numbering system for cold, medium and hot plugs........the best policy I've found is to seek out those who never or rarely blow plugs and ask them
Cheers
Scoop