well sunday i was out crusing and was getting on it and all of a sudden i had crazy blow by my dipstick blew out and oil went everywhere. so i trailered it home not really knowing why and came on the forum to see it has been talked about before.

so i decided i would clean up the oil mess and then decided to do a compression test and came back with 150 150 150 !!ZERO!! oh sh*t. so i then decided to pull the head today hoping that maybe a valve was stuck open or something cause a talked to mitch at ams and he said sounded like somthing to do with the valves.

well after 5 hours a poking around finally got the head off and found the hole in my piston instead of a stuck valve so now i have a blown motor.

the side of the piston wall is pretty messed up but on the brightside i dont have a hole in my block . so now i am wondering what to do? do you think they could just bore it out and sleeve just that one cylinder or would they have to sleeve all of them? i am not really looking for a crazy build since this car will probably never see over 400awhp.

oh and when i pulled the plugs the one spark plug had the tip broke off. does anyone have a clear explanation to why my motor blew up?
all help would be great thanks

i will post pics up tom its getting late and i have had a very long stressfull day.

UPDATED: PICS HAVE BEEN POSTED

 

oh and another thing is i did not even put down that much power for my motor to pop like this 343awhp and 287tq. really does not make any sense at all.

 

Damn that sucks bro GL with the rebuild, at least it wasn't your tranny cause those are 15k for a new one from mitsu at least

 

Pics of the piston?

So when it comes to holes in pistons... that is the classic example of pre ignition. Pre ignition occurs when you have a hotspot in the cylinder / head that ignites the charge well before the plug ever fires. This breaks down the boundry layer and melts holes in pistons as they are on the way up the cylinder. So.. if it is a smooth melted hole.....

On the other hand... if the plug failed and the electrode got stuck between the piston top and a valve or head.. that could smash a hole in the piston top..

Need some pics. A couple good close ups of the combustion side of the head and piston tops... so we can look for det pitting etc to see if it was an on going issue of just a bad set of circumstances.

Sorry to hear about this man. The more details we can get the better. I'd be happy to peak at the tune and see if it looks sane... shoot me a pm if you want my email address. I lost my first 4B11 in my X at 340whp on an uncorrected dyno dynamics. Never did figure out why... the pistons did not show any sign of det pitting but a chunk broke off #4. I think it was a combination of my aggressive tuning (4B11 was very new and after years of tuning 4g63's i was leaning too heavily on the knock sensor to tell me where the limit was, which by the way I think is less sensitive on the 4b11 in certain situations) and one bad boost spike on an upgraded turbo.

 

Ouch!! What the hell???

Let us know what you find. Really sorry to hear about this man.

 

Maybe you should pick up the Buschur built short block...you could boost even higher.

 

Sorry to hear the news!! You arnt the same 11sec ralliart that came to the meet in I'll on sat are you?

 

(angryevo) yes i am

Mad SB thanks for the input and all the helpfull knowledge. pics will be posted today it was dark last night once i got the head off.

this really sucks i dont want the build to be to expensive but my cylinder wall is messed up so is there anyway to just sleeve one cylinder? if not i guess i will have to figure something out

 

Can I ask which spark plugs you where using? The stock RA plugs or the Evo 10 plugs?

 

razorlab i was using the evo 10 plugs and they had under 10k on them. and i was on a pretty conservative tune too. mitch from ams said he would send me the logs from the dyno so i could see them. he said there is not anything in there that would have caused this.

 

What do the spark plugs look like now?

Have you been noticing any overheating issues lately?

Some other things that could have been a factor are: bad MAP sensor, EGR valve, or wastegate control solenoid.

Sucks to hear about your loss but sucks more the lack of knowledge on what could have caused this. Hope you get it figured out so we can all learn from this.

 

Well there is also another thing that I think played a large role in this.

When the car came to get tuned after he left there was a piece of metal inside of the header that psychically feel into the turbo and caused the turbo to not move. It literally seized the turbo so it could not move at all.

What I think may have happened is the backpressure and heat from this happening may have caused some damage to the piston and once he found out what was causing the boost issue, it may have already been too late as the damage may have already been done.

It is a bad situation since he ended up switching manifolds because of the metal part falling off the other header internally. Really poor quality control from the original manifold.

Mitch

 

yes that is probably what did not help the issue. i hope this never happens again. i am pulling my mmotor in the next couple days and senging it to a machine shop to get re sleeved. i just dropped my head off there today and he said about 100 to fix the damages on it. he said WOW LOOKS LIKE THIS GOT HOT!!

so i will keep you posted and update with pics soon.

 

that stinks dude. GL on the build though

 

HAHAHA! Well I am surprised this did not happen sooner honestly. I personally believe the 4B11 block is garbage. Josh it sounds like the same thing that happen to the POS sitting in the garage here lol. Don't listen to Andy anymore this prob wouldnt have happened. :P