Big end bearing and piston ring sizes?

[ianmway]

Hello All,

I'm going to replace the con rods on my Audi 1.8T BAM engine with some uprated ones, at the same time I'm going to re-hone the cylinders and replace the piston rings and con rod big end bearings.

Looking at the photos of when I last had the engine apart the cylinders are glazed, so really need the glaze taken off nothing more.

Looking at the available rings & bearings they come standard or different over sizes, bearings 0.25 – 0.50 mm and rings 0.01 – 1.00 mm.

There is nothing wrong with the engine with 122K miles on it; any ideas if I should buy the standard size or oversized?

I’m thinking the re-honing might require a slightly bigger piston ring and the con rod big end bearings leave as standard as I have no plans to regrind the crank as the job will be done with the engine in situ?

Thanks

[ianmway]

Cool,

Thanks for the response.

[ianmway]

Hello All,

VAG 1.8T BAM engine.

I’m in the process of ordering the extra parts to fit the Maxspeeding rods that have now arrived.

https://www.maxpeedingrods.co.uk/product/for-vw-go...

I’ve ordered all the required parts except the big end bearings, there is a bewildering array to choose from with a wide price range £25 - £150, there are 4 KS options alone?

I’m looking for some future proofing as I might go for a big turbo next year, so would be looking at something suitable for 400HP+.

Any recommendations/ideas?

Thanks

[ianmway]

Thanks all.

After some adivce & experince postings from one of the Audi forums I've ordered the ALC bearings;

https://www.ebay.co.uk/itm/ACL-CONROD-BEARINGS-STA...

[ianmway]

Cheers, gone for NE standard size rings.