Gent,

Just doing a deep dive on the locost while hiding in the shade 🥵

I'm going over my belt tensioner setup and supercharger mount, now while I have good access I have limited room for the tensioner. Oh the joys 🙄

I have knocked up a great little manual belt tensioner that will be really simple to use, but I'm now worried that I will need a auto tensioner instead. Can anyone confirm if a manual tensioner will be enough? Or if I will need a auto tensioner?

I mean its a very short belt that is only being used for the charger so my guess is the amount of stretch will be minimal?

Any input appreciated as always.

Jay

On my M45 the belt deflection at half way between pullies on the longest run (mine has power steering as well) is something like 9-10mm for a new belt, 10-12mm on an old belt (presumably allows for stretch).
I bought a Gates belt tension measuring device and proper adjustment stopped the belt slip I was experiencing at top revs.
If your run is very short I dont think ther'll be space for it but I can give you a measurement if required. It's not cheap at c.£35 but I think worthwhile if only for peace of mind.
You may also want to join MX5Supercharged on Faceache and ask trhe question there.