beaterX project thread

[turbotalon1g]

Good work mane!

[Matt D.]

If the assumption is expansion/contraction then the metal composition could be different, even if the clearances were the same.
I wouldn't expect OEM engine components to vary much.

[mlomker]

I wouldn't expect OEM engine components to vary much.

Between 4G and 4B? I'm no engineer but I don't assume that tolerances being the same between those two engines means very much.

[scheides]

I wouldn't expect OEM engine components to vary much.

4G63: Iron block

4b11t: aluminum block, (?)sleeves

That's all I was sayin. Perhaps expansion rates are different between the two and thus tollerences for the level of power/torque/boost that we enthusiasts like to run don't play well together.

[Murlo26]

Pretty sure the sleeves are iron on the 4b11.

[89_Colt_GT]

So I was expecting a beater not a Evo X lol

[Speedfreak]

I'd lean toward tune/detonation(caused by bad gas? maybe, but that tune is too on the edge IMO).. Then you can say those circumstances lead to the other theories as well(as a secondary effect).

I wouldn't use that head as is. Needs to be decked or cleaned up however possible(if possible). Those pits will make your tuning window smaller/attract the possibility of detonation.

[Shane@DBPerformance]

Did any of the other pistons look all detonation ravaged like #1? Wonder if there was something going on with that injector or just the bad Duluth gas.


Just talked to Shawn (simulatedwood) and he's leaning towards TTP's theory where the rings are gapped to tightly from the factory. Running good (high) timing for extended periods causes EGTs to get high and the pistons/rings fully fully expand causing the cyl wear that can be seen on all cylinders.


Higher timing lower EGTs. The scoring on the other cylinder is a little weird. Question is whether the damage was causes by parts from #1 getting into the others, the tight gap theory or something else. Were the spark plugs on the other 3 cylinders eaten up from det or look like something hit them?

[Pushit2.0]

If this was a tight ring gap problem there would only be cylinder wall scoring, I see piston damage from the top of the piston to the top ring land and bellow. This looks like a case of to much timing for the boost/octane level for your setup.

~John

[Constant_Project21]

What do you mean you don't know what caused that? The pistons lost chunks when you detonated and rubbed them against the cylinder walls before spitting them up into the chambers and munching your pistons.

I have to agree with Mr. Fatty on this one. That seems like a good case of detonation. Just because not everyone of the cylinders is fukked, doesn't necessarily mean it wasn't detonation. A friend of mine pulled apart one of his engines, after it went boom, and one piston had a hole in it, the others looked fine (from the top at least). Were you running a pretty aggressive tune on this beast? That, with crappy gas...prob caused your problem. I know I am just reiterating what others have said, sucks to hear doood!