What's your professional opinion Tom? For what I'm doing, am I better off with a turbo or a blower? What do you recommend? I guess I was always under the impression that turbos were more efficient at producing bigger numbers. Am I wrong about this?Scottie
Scottie,It's very difficult to make a blanket statement about that. They are both blowers. They do the same thing. They differ in the ways that they are driven. The turbo interferes with the exhaust stream, and the supercharger takes power off the crank. Both cause power drains in different ways, but the increases that they provide outweigh any losses by far. The biggest difference in noticeable behavior to the driver is the response lag that comes from the turbo. The turbo "lags" and the SC is instant response. Turbos are popular with road racers, but drag racers all use superchargers. There are pro's and con's. Size, location, and packaging can play big roles. Ability to fabricate a practical drive system can be an issue. You have to weigh all these things in the balance and decide what's best for the application.
Looks interesting, Scottie. Just one point, though - if you take a drive for the supercharger from the [redundant?] ignition drive, you will be relying on a very light timing chain and an even lighter duplex magneto / distributor drive chain, unless you plan to revamp this area of the motor. Also, any output to the blower will be at half the engine speed. If you can get a drive from the crank somehow, it can be more robust and you will be able to drive the blower at a greater choice of speeds and much faster if you need to. B.W.
The plan is to install a Bob Newby belt drive on this bike. Is it possible to order the belt drive with an additional V pulley off on the crank? I've had trouble trying to contact them, not sure if I have the wrong number or prefix or what. Scottie
This is where you start seeing what I have to go thru trying to get things done.Nobody makes anything we want, and nobody wants to make one-off things, unless they charge an arm and a leg, and takes a year.I have to deal with this all the time.
Ate you not keen on the idea of this blower Tom?
I'm not too worried about mounting the blower, Alex and I are both really good with custom fabrication. And if guys are bolting these blowers to Matchless and AJS bikes it can't be that hard. Also this seems to be the blower of choice for the Salt guys. Is using this blower as opposed to a turbo going to change anything on your end Tom? I don't want to make your job difficult but I do want to build some serious power and I feel that going with a blower we will be able to produce more power at lower RPMs.Scottie
It shouldn't make much difference to the head work.If you have a real lot of boost like a top fuel dragster, then we'd use a bigger exhaust valve. Basically, a good boosted head is a good n/a headYour cam guy is gonna need to know about it, though. I think there should be some movement happening on your heads next week or so at Mondello's.
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