beaterX project thread

[scheides]

Originally Posted by Murlo26

TTP's theory is interesting, but most other shops seem to disagree with them. I am not sold either way, but apparently the 4g63's have similar tolerances so who knows. I hate the idea that TTP could be right though, lol.

Yup, fukin hate TTP but who knows. Maybe the clearances are similar on 4G63's but there's some other reason that it does this sort of thing on the 4b11t?

Originally Posted by Matt D.

How do the rest of the pistons and head look?

Considering how uniform the scoring is across all cylinders I'm inclined to believe the piston ring theory as well.

The rest of the head looks fine, the rest of the pistons just have carbon build-up; I'll snap some pics later today.

[mlomker]

Originally Posted by scheides

Maybe the clearances are similar on 4G63's but there's some other reason that it does this sort of thing on the 4b11t?

If the assumption is expansion/contraction then the metal composition could be different, even if the clearances were the same.

[Matt D.]

Originally Posted by mlomker

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]

Originally Posted by Matt D.

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]

Originally Posted by Matt D.

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.