Originally Posted by 351ClevoCorty
A mate of mine runs the B&M brand of supercharger under the bonnet in a XB GT no mods to bonnet at all cracks very streetable 500-550hp.
...is it a Windsor? I've never seen a B&M manifold for a Cleveland.
There are a number of different B&M blowers. They have two small blowers and a 6:71, I think. The smaller blowers are like 260ci and 380ci (best I can recall...probably should just check their site, but I'm too lazy!) and the large blower is something like 426ci, which is typical for a 6:71.
I've had a lot of roots-blown cars. The thing to remember is that every revolution of the blower produces positive displacement. At 1:1 drive, a 426ci blower will pump a 357ci engine with a bunch extra air/fuel. At 25% overdriven, things start to get exciting! By the time you approach 50% overdrive, if you can still get traction, you won't be able to hang on that hard!
Blowers are pure fun...except when they aren't! They make tons of extra heat. They burn boat loads of fuel. And, everytime you kick it in the pants you get a sore neck!
The easiest way to tell a blower wannabe is when they're driving around the pits at full idle with the blower "surging" them along. Those are the kind of guys that you really enjoy flying past N/A.