Posted 06 October 2009 - 10:53 PM
Perhaps it would be a different idea to choose a better blower for the job. Granted, the E45 is cheapish and availableish, but for similar money, you can have others.
Do a google for Mazda Millennia blowers. These have about 20% more efficiency than a BINI blower and are pennies in the states. I hear about V-Max and what he has achieved and he's great, if as original as the Shorrock Design, and less efficient too. (by about 10%).
I also gather the rotor coating is very very slightly soluble in petrol in M45's and if you read the small print, they are not for suck through apps. Doesn't stop them lasting well, or people ignoring the small print.
Supply/Demand dictates the price. If you make them for £300, you'll probably make similar money.
Whilst you're at it, have a look at Chinese Superchargers, what is available. Maybe you could come up with a very good kit.
Anything over a BINI blower (64% max efficiency).....