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Old 02-06-2015, 08:59 PM
parmas parmas is offline
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Join Date: Jun 2013
Location: malta
Posts: 210
Default Re: spark plug heat range advice

Quote:
Originally Posted by chris-mr2 View Post
Thats what im trying to get my head round, correct me if im wrong.....

i have gone from a grade 6 plug to grade 8 (2 steps colder i belive) to dissipate heat from the plug more due to increased power and boost etc

What im trying to find out is that seeing as my plug is colder due to the water/meth do i need to be 2 grades colder, or would a grade 7 be more suitable
Specify your engine vs stock engine (if upgraded) in terms of boost / rev-limiter / engine compression / upgraded cams ?

Also what air temperature readings are you getting while water injection and what are your ambient temps ?
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