A Question For The Engine Gurus

[Zed Head]

Interesting topic.  It begs the question (I've always wanted to say that), should all rebuilt engines be rebalanced, if they use new pistons, or rods?

[Patcon]

Some of the other guys may have a more experienced opinion. I always have the rotating assembly balanced in the motors I build L6, V8 whatever. For the added costs compared to the total rebuild cost I do it. I don't have to pay someone for assembly so I come out ahead overall. A balanced motor should have less vibration and theortically rev smoother and potentially higher depending on the valvetrain. The last time I paid for balancing it was $300 or so...

C

[madkaw]

I'm getting ready to test this subject. I've swapped out the crank but I am using all the same rods and pistons. I don't plan on having the complete rotating assembly balanced.

[CEgg11]

I don't think you'll notice as large a difference in the L6 as you might in a V8, simply because you have no opposing masses.