Main/big End Bearing Sizes

[Jer309GTi 3]

I've stripped my Mi engine down at last, and have measured the journals on the crank to check if they are oval and what bearing size to use.

 

They are not oval, and the main bearing journals are 60.00mm and the big ends are 50.00mm (+/- about 0.04mm). Will I need to buy standard size bearings or will I need oversize ones?

 

Thanks

[petert1345402284 0]

and the big ends are 50.00mm (+/- about 0.04mm)

 

isn't that oval?

 

There are only two sizes available that I know of, std. and 0.3mm undersize.

[Jer309GTi 3]

Sorry didn't word that very well, I was a bit drunk when I posted that .

 

Each journal measured the same all the way around, The 0.04 was more like 0.02, and this was the difference between them, ie one of the mains could have been 60.02. TBH I think this was down to me not measuring very carefully.

[Jer309GTi 3]

I've checked the bearing shells and whats stamped on them is:

 

All big end shells are stamped with SK1 E539658

The top main shells have SK 87 E04938

The bottom main shells have SK 78 E04937

 

I'm ordering my bits from QEP tomorrow, so would these numbers tell them the size of the bearings I need?