Mark from OZ Posted October 1, 2009 Author Share Posted October 1, 2009 mackmech The engine was an out of chassis re build Piston to liner height checked under spec New liners pistons fitted ring gap checked over boost? "standard fuel" runs 21.75 boost. spec is 21.6 Now pistons 2 & 4 cracked in 4100.00 Ks it took up to 139.00 Ks to crack No5 How come pistons 1 3 6 are still good....... If pistons were hitting the head i would not be asking questions it would have dropped a valve by now. Keep guessing........Mark Quote Link to comment https://www.bigmacktrucks.com/topic/10775-cracked-pistons/page/2/#findComment-41207 Share on other sites More sharing options...
Bollweevil Posted October 1, 2009 Share Posted October 1, 2009 Mike i will let you know how it goes. Should be good That particular brand uses MAHLE brand, Google them up very good brand. Certanly better than the other brand........Mark Mahle earned their reputation in Formula Racing. They are certainly not a bad choice as far as pistons go. I have used their coated and un-coated pistonsin race engines and hot street engines, with good results. Quote Link to comment https://www.bigmacktrucks.com/topic/10775-cracked-pistons/page/2/#findComment-41251 Share on other sites More sharing options...
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