Reciprocating mass for crank balance & Int vs Ext Balance

[ElementR]

As far as I can find, for our 2.7L engines, it's 50%. Can anyone confirm? My machine shop just called to verify. His equipment vendor said 44-46% but that appears to be for 2.8L. Just looking for confirmation. Also, as far as I know these engines are internally balance. Appreciate the feedback. TIA

http://www.hinesindustries.com/docum...procalmass.pdf

[y3ti]

I'm supposed to check in on my block today. I'll ask the shop if they have any info.

[ElementR]

Thanks. I'm pretty certain that the engine is internally balanced, but would be good to hear it from someone else. The reciprocating mass question was not expected. I believe Hines Industries is a solid source of info, but no one else I've spoken with in the Audi world has any knowledge. I tried JHM and IE with no luck.

[y3ti]

It is definitely internally balanced.

Allan at BEP said it's 50%. Anything other than 50% is uncommon. I have no idea how much experience he has with Audis, but he said he has dealt with a few.

[ElementR]

Great to hear he agrees. I know the guy I'm using is sound and has a ton of experience with domestics, but less so with imports - he's only doing the balance work on this engine. He was inclined to go with 50% but when he called the manufacturer of his balancer, they said 44-46%. I suspect they got confused with the 2.8L. Thanks again.