Main bearing wear..

[Jhonno]

All block side big end bearings..

https://goo.gl/photos/HDTvhppLCCzSgFtJ7

[Jhonno]

Boosted LS1 said:

Jhonno said:

All block side big end bearings..

https://goo.gl/photos/HDTvhppLCCzSgFtJ7

They look good from what I can see.

Well that is a bonus..

[Jhonno]

Boosted LS1 said:

Jhonno said:

Boosted LS1 said:

Valid point but why is there even wear on both pinch surfaces? The shell won't have moved across the cap. I think there is more to this Sherlock ;-) ?

Such as?

Both end mains were showing odd wear on the lower bearing only.

If there was dirt under one pinch surface/corner then the wear would extend up to it as expected. Your shell has wear up to both pinch corners. I doubt there was dirt under both ends of the shell.

The pictures show wear across the whole of one side of the shell. To me that indicates tilt but I don't know the answer/cause. I'm still thunking and learning :-)

If the fault's on both of the end shells then I'd suspect a crank flexing/balance issue.

Right.. Whilst I am not sure about the crank flexing, balance could well be an issue. This crank is cast and know for snapping.. Could it be if it was unbalanced it could be a cause? It revs to 7.5/8k..