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spark plug heat range recomendation
its time to get some new plugs,and i wanna upgrade.from what i have read,it seems i could go 1 or 2 points hotter,but i'm still a bit confused by what would be best.whats do you guys recomend?
i drive mostly highway[spirited,at times].87 n/a w/s5 rotors+intake manifold.mild streetport.true dual exhaust.cooling system is upgraded. also,actual ngk model #'s would be nice thanks guys david |
Hit www.RacingBeat.com and browse to their '86-'91 RX-7 Ignition Category.
Look for the "Performance Spark Plug Hwy - Street-ported" link. They recomend the NGK B9EV for that application. |
just use stock... fine for N/A
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I got bored and checked the MazdaMotorsports.com catalog. They don't have the exact part number listed (B9EV) but they do have a (B9EGV).
Here is the note that appears for that plug on MazdaMotorsports.com The NGK 'EGV' plug provides a number fo heat ranges. However, the reach of the EGV plug is shorter that the racing plugs or stock plugs. This means that it's flash point is not as close to the combustion chamber, resulting in a loss in power. It also leaves some threads in the spark plug hole exposed, where carbon can build up resulting in possible detonation. We recommend use of racing plugs or Stock 3rd-gen plugs. The fine wire of the EG (nickel electrode) and EV (gold palladium electrode)... BTW: the "TRUE" racing plugs that NGK sells is not an option for a street driven car. This also came from MazdaMotorsports.com NGK recommends that you start your vehicle and bring up to operating temperature with stock heat range plugs, then switch to the racing plugs. |
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