How annoying. It turns out there isn't going to be enough space to easily mount the Eaton M45 supercharger I was planning on using so I change of plan was required which brings me to the Aisin AMR 500.
This thing is tiny. Not much larger than a mini alternator and it still packs quite a punch. The 500 stands for 500cc per revolution which according to what I've read, will equate to about 8-10psi on my engine.
It can operate in either direction and mounted in any orientation so should provide me lots of options when it comes to mounting it in the mini engine bay.
I picked the unit up from Aliexpress for £160 delivered and it was refurbished to as-new condition. I was also able to specify the type of pulley I wanted fitting. The unit is shipped dry and will need oil adding. 85W-90,GL5 is recommended.
A bit of tension
A key component of making the supercharger work is going to be the mounts and the belt tesnioning system. Having spent many hours studying examples I have settled on my own design that uses two rod ends with opposite threads and a linkage. Turning in one direction shortens the length and turning in the other lengthens.
A Cardboard Aided Design template was used to make a mock up of the tensioner. The circle represents an idler pulley wheel that will press against the SC belt.
The next job was reducing the ID of the pulley wheel bearing to a suitable size for mounting. I also need to position the pulley a set distance away from the SC mounting bracket so that it is inline with the belt. To achieve both things I designed "top hat" bushings that insert into the bearing reducing the ID to 8mm.
The bushings were turned from aluminum by dlf-engineering on eBay for a very reasonable fee. They were made exactly to my drawings and the turnaround time was 3 days.
That's all for now. More to follow.....