From what I have been able to determine, the "Mini" M45 is the same "guts" as an Eaton M45, but in a modified housing to better suit fitment to a mini. ie its an Eaton M45 build specifically for BMW
to suit a Mini Cooper S engine.
The strange looking flange you may have noticed on the rear is actually an extension of the driveshaft and is there to drive the engine's water pump on the supercharged mini engines. You'll need to come up with a blanking plate to cover this, or see if it can be removed completely.
By coincidence, there is a Mercedes M45 on eBay.com.au at the moment. Again, it looks different, but I assume is again the same guts, just in another different housing to suit mounting in a merc. This would actually be a better fit for a Datsun 1600, as it has intake and outlet ports on same side, as opposed to the mini which has its air intake at the rear. This will, I feel, make it a bit harder to manufacture air ducting using the mini one as I'll need to bring it out from under the extractors and to the front of the car to get some cool fresh air.Plus, it uses a weird shaped outlet, which will likewise increase the difficulty level in fabricating air ducting to fit here.
http://cgi.ebay.com.au/Supercharger-Eat ... dZViewItem
As far as what capacity motor these units will fit, my gut feel (and a bit of research
) is that 1.6 - 1.8 litre is the "perfect" application if you're after performance (ie higher levels of boost), would probably still be good on 2 litre (maybe running slightly lower boost (10 psi ?, so you don't over-rev the blower). The mercedes one is actually fitted to a 2.3 litre engine.
All the research I've been doing since this post was dragged up again has got me worried that I'm after a bit too much boost out of these little blowers. May have to make a new pulley to drop it down to somewhere closer to 12 psi
Anyway, I've still got months before I need to get serious about settling on final specs for my install
One final tip.
http://www.sprintex.com.au/ has a handy little excel spreadsheet for calculating various configurations of supercharger. Only problem I've found is that it uses the wrong capacity for the M45, therefore making results wrong
If you use the spreadsheet to get results for the M45, select "Autorotor 0A2076" as the supercharger type instead of M45. This Autorotor has the right capacity (ie is same capcaity as M45) and will therefore give the correct results.
And even more finally, just out of curiosity I plugged a few figures into this spreadsheet. It reckons an M45 should be good for 12 psi on an SR20, assuming the SR20 is revved to 7,000. If you want to rev the SR20 higher, you may have to settle for a bit less boost or you'll risk a blown blower.
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) might be the blower off the Mazda Eunos miller cycle engine.