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Im having this annoying problem on my 26/30 at the moment and i originally thought it was a one off problem and its happened on 3 different sets of plugs now.

The porcelain on the top of the plug keeps cracking away. It looks like its starting to crack from the top down. I assume its heat related but the motor is running with no coilpack cover, afr's are mid 11s and pretty conservative timing numbers too, its only running a pair of stock gtr twins and previously ran a single gt3076r as well. Its got stock 26 coilpacks, and ecu is an Autronic smc. Im also making sure i dont tighten the plugs too tight too as i thought that was possibly the cause, so i have got 2 different people to install them and they all have same problem. I cant remember what cylinders it did last time but it was on 2 of them and this time i found the worse cracked one on cylinder number 1 and then the other on cylinder 4, i dont know if its happening on the same cylinder each time.

any ideas whats causing this? anyone had the same issues? These are BCPR7ES ngk's too

heres a few pics....

post-40430-1240802498_thumb.jpg

post-40430-1240802539_thumb.jpg

Whoever is installing the plugs/coil packs is breaking them.

They don't just randomly crack like that. They are either being installed incorrectly, there is a problem with the spark plug socket being used, or the coil packs are being pushed down too hard.

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