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got one other way,is going machine shop cut down abit the piston firing surface,![]()
He3... actually i think the message is for simpleguy who's using a 4G93T. not vielsideboyz that uses ZZT231 with 11.5 CR


Anyway, Skimming the surface require dissembling the engine from the engine bay. Workmanship is RM600-RM800. Sending to engineering shop for machining will cost you another RM150-RM200. When piston rings taken out from the pistons, there are high possibility of breaking just like maruku... Another RM200/set
Somehow, taking out the engine head during the piston dismentaling will damange the head gasket. Getting a cheap carbon gasket will cost you another RM25. If metal RM170 for 1.5mm. Of course, it's also a choice to use back the existing metal gasket. But u'll realize the sealant coating is completely weared. Not adviseable.
Total cost would be RM1000-RM1400. Plus, the skimmed pistons will not be as reliable... Some ppl might say, "aiya... 1mm cut only ma... where got effect..?" Well, That's from engineering point of view. Everything is designed for a purpose.
Hmm... 2.0mm metal gasket could cost you RM350-RM500. But taking out the engine head only is somthing less hassle. Just my 2 cents... Cheers...