Which spark plug?
Thread Starter
Teching In
Joined: Jun 2021
Posts: 35
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Which spark plug? Hi all, I have a 2002 Z06 383 stroker track car that has mahle pistons, OEM ignition, crane cam, ported heads and headers on pump gas 93. I have no idea what compression ratio or size of cam unfortunately. Currently it has NGK TR5IX Iridium spark plugs, my question is is this a good plug? It runs at full throttle and no street use, but I have read a colder plug might be in order? I also heard silver tipped plugs might be a good choice? THX Brian
Unless the plug is showing me otherwise, I’d stay right there. You need to base plugs on compression, fuel and usage of vehicle (rpm). Maybe jump to a TR6IX, which is a step colder, but seriously unless your seeing a reason to change heat ranges, I’d stick with the 5’s. The TR5’s are a great plug.
OP, unless you are seeing issues with knocking pre-ignition or severe fowling of the plugs youre in the right heat range. Going to a cooler plug might help something but what I don't know. There are no issues as of right now to deal with apparently
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
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Need pics of spark plug base to see how much heat is in plug. Prefer from the cylinder(s) that are the hottest. Typically doesn't hurt to run the coldest plug you can without fouling to minimize preignition potential.
