Quote:
Originally Posted by GeeTwo
This looks to be like a quite tight definition of "properly". If the holes aren't bored a lot closer to square than many teams can probably manage, the belts on the drive shaft will migrate one way or the other, and shall end up rubbing on the bearings (not TOO bad, but not optimal), or each other (as described), or both (one goes to a bearing, the other is jammed against the first belt, with the same results). The 'both' case actually seems rather likely as I work through the variations.
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A quality live axle drivetrain should be striving to get those bearing holes as concentric as possible for maximum efficiency and best performance anyway. This is significantly easier in a tube drivetrain, where both "sides" of the drive are actually the same piece, than it is in a drivetrain with multiple side plates. These efficiency gains are one of the subtle benefits of a "west coast" tube style drivetrain, and it absolutely isn't out of reach of teams who have some access to machining resources and put an emphasis on quality.
Quote:
Originally Posted by Ty Tremblay
Does 2791 add any additional spacing between centers in their drivetrains?
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I've heard adding .005-.010 can help, but 2791 has always run them exact center with no additional length. The belts initially seem a little looser than a brand new chain, but that's just how belts like to run. One of the pitfalls of manually tensioning belts is that it is somewhat easy to over-tension a belt, weakening the whole system, because it seems like belts should be tighter than they actually need to be.