Interested in the group's thoughts on this plug's heat patterns. It's an R45TS out of my 10:1 462, been in for about two years with mixed track/street use. AFR's checked occasionally at the tailpipe, they run 12.5-13.0 WOT, 14.5-15.0 Idle and 16.5-17.0 Cruise in <1000 ft DA. Last use cycle for these plugs was on a 2500 DA day, 100 miles cruise to the track, 6 passes and 100 mile cruise home (I recognize the best way to read is pull them at the track). All in all, I dont think they look too bad, all 8 look like this (the horizontal lines are from the hacksaw blade when the threads seperated)
They look good to me, how about some more info, plug gap, timing, total and initial, fuel used and jetting, and what kind of number are you running at the track? I'm in the same boat, i have been running autolite #26 at .035, same as 45's, but I think i could go one colder, maybe r44ts. They look pretty good for that compression ratio, thought they would be a little hotter looking for that compression, that why I was asking about your timing.
So they (were) at .035. Total timing is 36 (14 initial), with 10 vacuum advance, and I run 93 octane for racing, but will run 87 around town , not beating on it. It's got a 71 540 800 cfm Q-Jet, 75 jets with 44 rods, and CC seconday rods on a C hanger. It CAN run 12.4's at 106, but thats really a late fall thing. I put in a set of NGK UR5's, which I understand are the heat range equivelent of 44's, so I'll hack one of those apart after my next track day to check. I never had a problem with these but after 2 years the resistance was creeping up.
