No offense but you did a little of your own rampant speculating when you claimed that all these are tuning related. How do you know that? Are you fingering through everyone's logs?

Still good questions for TTP. How many?

 

What was your rev limiter set at?

 

I should have been more clear when I posted what I did since I actually wasn't talking about these specific piston failures. I was talking about a few documented cases (the threads are on EvoM) of some owners who blew holes in their blocks, bent pistons, etc...and it turned out each of them were not properly tuned for their mods and one guy didn't even have a tune. Crazy stuff going on out there. Just using an example to say that the tune is one of the most important things and is often overlooked when parts fail.

On these specific piston failures, we do need to know which state of tune each of the cars was in when the damage happened. Were the cars completely stock? Were they stock tune, yet modified parts? Were the tunes super aggressive and pushed as close to the edge as possible (or even over the edge)? Etc, etc.

 

Good write up TTP

I appreciate you taking the time putting this together.

My car did have a raised rev limiter of 8k. Boltons and mild tune (peak of 22 psi).

 

^ Specifics?

 

Again, this is not the thread for general failures or nitrous use. This thread is for the specific piston and ring issue in the original post. You should post general failures in the other thread.

 

All posts that don't fit the category above (including pics) moved here:
https://www.evolutionm.net/forums/ev...-thread-8.html

 

still no verified "stock engines" with problems eh? so I assume they where modded then and like I said they where designed for the output that mitsubishi wanted , not what you can push through them....theres just too many variables to conclude its a design fault

And being in racing for many years and having used mahle pistons , I doubt highly its a metallurgy issue with their pistons...that company has been around probably before alot of us have been alive , they wouldnt release a piston per manufacturers specs if they knew the design was bad , that'll give them a bad name even if its mitsu's design fault ...

Im willing to bet if anything its in the valve train , namely the springs and namely valve float....

 

These issues are not caused by piston to valve interference.

 

Have you seen the ring land damage without any bent valves or damage of any king on the valves?

 

GREAT INFORMATION! This is one of the best reviews/explanations I have ever seen!!

 

Can we get some answers to how many engines you have seen this happen to and the mods, boost, tune, etc?

It seems that you are skirting around those questions.

 

Yes. All of the ones in this thread as well as the others we have seen have not have any valve contact. These are not caused by valve contact.

Furthermore we have seen a missed shift and valve contact so bad that the engine has no compression, yet the pistons still have not cracked or broken.

 

Has anyone discussed this with an engineer from Mitsubishi corporate?

 

LOL, they will never admit this being a defect, even if they privately might suspect it is. Look what happened to Toyota.