Well the head has been ripped off of the block, no resolution yet but the District Rep sent his pictures to Mitsu in
California and I should find out sometime tomorrow if the warranty is holding I guess. I was able to get down
to the dealership and take photos myself, here is what we are looking at.

For those of you not familiar, my first thread is here: https://www.evolutionm.net/forums/sh...1&page=1&pp=15

Cylinders


Cylinder walls


Cylinder #1 wall


Cylinder #2 wall


Cylinder #3 wall


Piston #1


Piston #2


Piston #3


Piston #4


Cylinderl #1 valves


Cylinder #2 valves


Cylinder #3 valves


Cylinder #4 valves


Plugs #1 & #2



..Piston #1 took the most beating, probably because it was the first rod to let go. None of the pistons show any
major signs of detonation (as far as I can tell), nor do the plugs, which is good. I'm not sure how exactly the wall
scoring came about though, wether it was a matter of the crank being shifted causing a messed up stroke or
what. Wall scoring is front and back of the cylinders, not side to side.

 

Are they basically going to replace your whole motor

 

Thats what the tear down was concerning, and only if they decide this is a warranty job. It would require an entire long block and transmission. See other thread.

 

Looks pretty much detonation-free to me as well. Hope Mitsu comes through for you.

 

Ouch!

 

My Evo is thinking of your Evo and hopes ya get this covered under warranty

 

you were a little bit lean looking at the piston tops, but not too bad. I see no obvious signs of knock either. Hopefully Mitsubishi will do right by you. From my experience as an engine builder/racer, I would say the flash and modifications likely had no effect on the damage.

The only thing that they could probably get you on is if you had the factory rev limiter removed and they claim that the rod bolts were stretched by over-reving the engine (whether you did or not). Good luck man.

 

How much should it normally cost to fix this if it isn't under warranty ? I am asking for a friend... not for me

 

with labor including the valves and a valve job I would estimate approx 6-8K. The turbo should probably be replace too because there was a lot of metal bits that went out through the exhaust valves and throught the hotside of the turbo when that popped.

 

That's in the plane of crank rotation, which indicates very heavy side loading, friction, heat, etc. Those piston skirts are undoubtedly ugly as well.

 

Do you have an understanding of whether they are going to charge you for the teardown in the event that it's not covered? I'd be worried about being told it's not covered and then getting a big bill for the teardown on top of that.

 

I'm curious why they would cover it with your mods????

 

I dunno, how can that motor get all that damage - balance shaft blown through the block, rods ripping through the oil pan, and broken valves , not to mention the torque it would take to crack your bellhousing while just cruising along on the street in 5th gear at low rpms?

Are you triple dog sure with a cherry on top you didn't over-rev the hell out of that motor?

Although I can't imagine an over-rev would cause that much damage. I major bottom end seize could probably though.

Very interesting.

 

if you read the previous thread a major bottom end sieze is exactly what happened.

 

I stopped reading the other thread when people suggested it was because he used a different oil.


I could see it doing that much damage if the motor seized in the upper RPM's but cruising rpms?