Figured id share my garbage..

[Turbo440Dart]

Had a few moments to come out and check some things. Removed the top ring and squared it in the bore. Right on the nose .032 on the feeler gauge. Moral of the story is don’t rush garbage together I suppose.

@TT5.9mag called it a few days ago when he saw a photo of the bore. “That looks like ring flutter”

 

[TT5.9mag]

Had a few moments to come out and check some things. Removed the top ring and squared it in the bore. Right on the nose .032 on the feeler gauge. Moral of the story is don’t rush garbage together I suppose.

@TT5.9mag called it a few days ago when he saw a photo of the bore. “That looks like ring flutter”

Tell me more. Do you think you messed up somehow?

 

[Turbo440Dart]

Tell me more. Do you think you messed up somehow?

I think I somehow gapped the rings wrong while rushing the motor. Also I was told that is a common failure point on that lineup of wiseco piston and nobody is to blame. So who knows at this point, but me messing up isn’t out of the realm of possibilities.

Not sure if you heard my dad protesting when I kept turning up the boost. Told him “if nobody goes looking for the limit of stuff how do we know what it’ll take?”

I expect to break stuff, whether from negligence or just a pure accident. I’m learning and having a damn good time doing it.

 

[TT5.9mag]

I’m learning and having a damn good time doing it.

That sir is the ultimate prize. And the correct attitude to bring to the table.

 

[71GSSDemon]

So. The piston engineer said we have seen this exact break when losing timing control and suffering knock. The land between rings breaks and stays put (polishing on ends) until the rings break.

He shared examples but I cant copy them. Looks identical

 

[TT5.9mag]

So. The piston engineer said we have seen this exact break when losing timing control and suffering knock. The land between rings breaks and stays put (polishing on ends) until the rings break.

He shared examples but I cant copy them. Looks identical

That’s interesting. I would say we never lost control of the timing. And the plugs show that. We weren’t too conservative with it, but we also didn’t run it out to the limit (IMO) either. How does the 2nd ring get torched?

 

[71GSSDemon]

That’s interesting. I would say we never lost control of the timing. And the plugs show that. We weren’t too conservative with it, but we also didn’t run it out to the limit (IMO) either. How does the 2nd ring get torched?

Just passing on what he said. That is what they found during the investigation of their failure.

The knock (his opinion) shakes the piston enough to crack the ring land. Combustion would get around the top ring and burn the 2nd where it was broken.