B C Posted June 10, 2017 Report Share Posted June 10, 2017 I pulled the pistons from 5 and 6. The problems I had were never about head gaskets and they were never about tuning. It was all about ring gap(thermal expansion makes the ends touch, buckle, and break out the ringland). The smooth pieces were found in the recess by the wrist pin, so they had dropped out below the oil ring and got rock-tumbled between the cylinder wall and wrist-pin recess for some time. I had made sure the engine builder knew this was for a boosted application and he acknowledged it and told me "The rule of thumb is ___ " wider per psi. But after checking the build sheet, he had set the gap to stock size. Stock cast pistons don't help the situation at all, but they weren't the root cause here. If I ever do a boosted setup again I will definitely spring for forged pistons, and will set the ring gaps myself. Quote Link to comment Share on other sites More sharing options...
KaiserRolls Posted June 10, 2017 Report Share Posted June 10, 2017 B C, m42b32 and Jdesign 3 Quote Link to comment Share on other sites More sharing options...
jc43089 Posted June 10, 2017 Report Share Posted June 10, 2017 Should have done it yourself. Bummer. Sent from my 831C using Tapatalk Quote Link to comment Share on other sites More sharing options...
GunMetalGrey Posted June 10, 2017 Report Share Posted June 10, 2017 Sucks man, I know the feeling. I didn't properly gap my first rings in the NV and I know that's what lead to it's demise. Live and learn! Quote Link to comment Share on other sites More sharing options...
Boris3 Posted June 10, 2017 Report Share Posted June 10, 2017 Glad you solved the mystery! Quote Link to comment Share on other sites More sharing options...
B C Posted June 10, 2017 Author Report Share Posted June 10, 2017 A little bit beyond the scope of some engine rebuild in a bottle But thats what a piston can look like and still hold 70 and 90 psi Quote Link to comment Share on other sites More sharing options...
YoungCR Posted June 11, 2017 Report Share Posted June 11, 2017 As much as it sucks at least this chapter can be closed now as far as your build goes. Quote Link to comment Share on other sites More sharing options...
straight6pwr Posted June 11, 2017 Report Share Posted June 11, 2017 might as well email this to your builder with a 'friendly' message. glad you got an answer. Quote Link to comment Share on other sites More sharing options...
Daggerty Posted June 11, 2017 Report Share Posted June 11, 2017 See this is why cx racing turbos are junk B C 1 Quote Link to comment Share on other sites More sharing options...
patsbimmer1 Posted June 11, 2017 Report Share Posted June 11, 2017 Well that is damn impressive. Quote Link to comment Share on other sites More sharing options...
HipMF Posted June 11, 2017 Report Share Posted June 11, 2017 run it Quote Link to comment Share on other sites More sharing options...
B C Posted June 11, 2017 Author Report Share Posted June 11, 2017 Ran it. now errbody in the hood has lung cancer Quote Link to comment Share on other sites More sharing options...
Jeff Posted June 12, 2017 Report Share Posted June 12, 2017 Jesus and it only smoked a little? Quote Link to comment Share on other sites More sharing options...
B C Posted June 12, 2017 Author Report Share Posted June 12, 2017 Jesus and it only smoked a little? Smoked like a Snoop Dogg concert on April 20th. When i limped it as slow as possible you could still see and smell a cloud of burned oil behind the car . Any sort of throttle left a solid lingering cloud Quote Link to comment Share on other sites More sharing options...
Jdesign Posted June 16, 2017 Report Share Posted June 16, 2017 Should have just added some of this. Would have sealed it right up! But all jokes aside, Im glad you figured it out. Knowing what the actual problem was , and that it wasn't your fault is a nice piece of mind. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.