Hi all of you,
I have a question.
I can't get my engine to stop vibrating. I just rebuilt it, it vibrated before and I rebuilt it completely. Top end is new, heads fine, pistons new, the only old parts are: Connecting Rods, Crank, Block. It doesn't idle very well, but I guess that' still a setting issue. But it vibrates slightly all the time, and when it gathers RPM it keeps on vibrating in a sort of slow but strong VVVRRRRMMMM....VVVRRRMMMM.... way, getting faster with engine speed. I made double sure all clearances and everything were right.
BUT: I have two different types of conrods. 5 of one type, 3 of the other. They all weigh the same (+/- 1 gramm) but the three have heavier big ends. Can that cause vibration that strong? It's only about 20 gramms more on the big ends... Didn't think that would matter with a big heavy crank like in an SBC...
Could it really be the con rods? Or would a not balanced crank do that? All in all, I have no idea where those parts came from, they were in the engine, which had been rebuilt before.

Hope somebody knows about the effects of incorrect balancing...
Thanks, Max.

PS: It vibrates even without TC and Fan assembly attached, balancer is new.