06-01-2015, 04:39 PM
Hi Dan, reversing the blower *can* be done by removing the front casting and turning it (and the rotors I think) through 180 degrees, it's been done on the Eatons, but Some Precision is required as the bolt pattern isn't symmetrical and you'll probably need to drill and tap fresh threads in the main casting, a couple or three dowels in reamed holes would probably be a good idea too!
Rotor tip clearance needs to be maintained or it'll not survive long, I think they're set up with plastigage between rotors and casing, that's then measured and the front casting's adjusted - sounds fiddly!
The Eaton blowers fitted to Mercs (and Cooper S's?) also have a bypass valve to allow 'em to run normally aspirated when the ECU disengages the magnetic clutch (like an aircon clutch) at very low loads, e.g. idling, over-run etc. to reduce friction and pumping losses when the boost isn't required - more complication!
Definitely go look on the Eaton site and check out what size of blower you need running at what max RPM - I'm planning something similar and am intending to base it around a blower from a car making the same max BHP as I hope to get from the bike, which puts it out of the Merc CLK range... Unless I run it well above the manufacturer's designed RPM :(
Rotor tip clearance needs to be maintained or it'll not survive long, I think they're set up with plastigage between rotors and casing, that's then measured and the front casting's adjusted - sounds fiddly!
The Eaton blowers fitted to Mercs (and Cooper S's?) also have a bypass valve to allow 'em to run normally aspirated when the ECU disengages the magnetic clutch (like an aircon clutch) at very low loads, e.g. idling, over-run etc. to reduce friction and pumping losses when the boost isn't required - more complication!
Definitely go look on the Eaton site and check out what size of blower you need running at what max RPM - I'm planning something similar and am intending to base it around a blower from a car making the same max BHP as I hope to get from the bike, which puts it out of the Merc CLK range... Unless I run it well above the manufacturer's designed RPM :(
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(Douglas Bader)
(Douglas Bader)