Supercharger drive belt length

[ruishy1]

just about finished my supercharger conversion, and measured the belt length needed at 2750 without the adjuster tensioned.
how much does the tnesioner move ?
so i can find the correct belt asap

 

[cribbj]

Get a friend to help you, and hold the tensioner in its fully down position, and measure the belt length that way, then measure again with the tensioner released, and take the average.

The average will still be slightly shorter than you need because of the non-standard way that every company seems to measure their belts, so you'll have to get a couple that are close and test fit them to see.

 

[ruishy1]

just hard as all my mates are too busy out drinking and not into cars !
il see if i can get help