Just got done reading this entire thread, thank you Chris for going to all of this trouble!
You confirmed with hard data something that I had kinda suspected from my rough "uncalibrated hand" measurements. I had installed a 3" blower with a 150* thermal switch and suspected that when the blower was off, it was hindering flow, and when it was on it was helping, but not by huge amounts.
I agree with everyone else's conclusions, I'm going to install a 4" blower with minimal bends that will be switched on most of the time and draw cool air from the side of the WC.
What do you guys think about a 4" blower plumbed into a 4" opening on the clutch cover, with the stock intake re routed to a cooler source of air? This way the clutch has it's own source of air, and the blower adds air through a completely new hole.
Hey Mike, I'm headed to the St Anthoney Sand dunes (Thursday thru Tuesday - 27th thru the 2nd) You should come up and test your cooling...If you don't bust a belt there - then you've got a good set up. ---- I gotta drive 10 hours but your only about 4 hours away from the dunes.And why the hell would you ever turn the blower off while you're riding? That makes no sense to me