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197 / 200 spark plugs in 1*2
- Thread starter plees
- Start date
Brigsy
ClioSport Club Member
T.Turbo
197 plug is a 7 heat grade, compared to 172 which is a 6 heat grade.
So essentially you would be running a slightly colder plug. Cant see you needing it unless cr increase etc. With cr increase or high rpm screamer, the colder plug would be better for increased combustion chamber temps/knock resistance.
You could fit them to a stock 172 but wont see any performance gain. In theory the colder plug could carbon foul easier, but in reality prob wont have an issue. For instance i run 8 grade in all of my meg engines, whereas stock is 7 grade and ive never fouled a plug.
Some info on here. https://www.engine-dynamics.com/Ser...89/NGK-Performance-Iridium-Spark-Plug-Set.asp
So essentially you would be running a slightly colder plug. Cant see you needing it unless cr increase etc. With cr increase or high rpm screamer, the colder plug would be better for increased combustion chamber temps/knock resistance.
You could fit them to a stock 172 but wont see any performance gain. In theory the colder plug could carbon foul easier, but in reality prob wont have an issue. For instance i run 8 grade in all of my meg engines, whereas stock is 7 grade and ive never fouled a plug.
Some info on here. https://www.engine-dynamics.com/Ser...89/NGK-Performance-Iridium-Spark-Plug-Set.asp
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