My sleeper

[diesel des]

Dont no it, i have to look how many degree. But i fix them to highest torque

Sure I understand. But for example if you reduces timing 2 degrees did torque only fall of a few nm? Sometimes you need to stop advancing timing just before the very top of the torque curve as you may be causing too high cylinder pressure. Only a cylinder pressure sensor can tell for sure.

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[hammer]

Dont no it, i have to look how many degree. But i fix them to highest torque

[diesel des]

Too much timing advance at low rpm? The engine may not ping but the very high combustion pressures damaged the bottom bearings? If it was torque causing a twist in the crank, main bearings top and bottom would be marked. I don't think too high torque on Its own will do this within reason. The crank is exposed to a lot of forces and only some are the torque it's carrying. Even a stock Tdi with over twice the compression of a 20vt engine and some reasonable boost numbers will generate high compression forces pushing the crank down on those bearings. Even if it's power and torque generated are lower than yours they can have higher forces maybe. So as it's only the bottom main bearings then i think excessive compression forces cause this. So that is likely to be excessive timing. What's your timing map look like?

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[gnutz2]

Do a search but I'm pretty sure jp at jnl racing had a similar problem, the bearings would let go but only at low rpm and high torque, eventually they came to the conclusion the bearings didn't have enough support and the crank would deform and touch.

[hammer]

0.05 is quite right for this kind of build, IMHO.
I think you need to check main tunnel alignment, and crank check for problems with journal and pin with parallel / eccentricity

Measure more than everything

[Error404]

0.05 is quite right for this kind of build, IMHO.
I think you need to check main tunnel alignment, and crank check for problems with journal and pin with parallel / eccentricity

[jsol]

I found this helpful regarding clearances etc.

http://theprojectpad.com/viewtopic.php?f=32&t=1370

[hammer]

The topsides from mainbearing 2-5 are fine

[hammer]

Engine is assembled so i can take pics. Clearance is 0.05 for Main and Rod bearings

[Thuppu]

Better..? I doubt that.

[Error404]

We can't see what bearing is which, line them all up for a picture, 1-6. If crank is bending they should show uneven wear too, they just look scraped like oil film has broken down.
What oil clearance are you running? They also look badly scored, from debris in oil.

[hammer]

Think it's better when i go for a billet crankshaft. Anyone know Where i get a one with 95.5?

[hammer]

Looks like metal on metal contact. Is the the main tunnel is out of alignment?

Yes 2-5 but 2-4 lie wrong, the nose have to be on the top. Like the 5[emoji85]

[Error404]

Looks like metal on metal contact. Is the the main tunnel is out of alignment?

[hammer]

Just an old school K31 7175

Is it possible the girdle has bent the main line? How well did you do/measure the shimms?

Shimms for the girdle are 100% correct. Measure it with a digital depth and crankshaft wos easy to turn without rod.
I think low rmp and high torque bends the crankshaft