Re: A's on the WMB

[Craig Haber <albatross@harnessnet.com.au>]

Keith Malcolm wrote:
> Thanks for confirming my story that roots blowers are superchargers. However
> I fail to understand how power and fuel are wasted in getting a turbo up to
> speed as the turbo is driven by the exhaust gassesnot by a mechanical drive.

It'd reduce the exhaust flow, the same as fitting a small exhaust to
your car.  What's the first thing that gets trashed to improve a car's
performance - the exhaust, you generally want to eliminate
back-pressure. 
While the turbo's being wound up, the motor exhaust flow is restricted.  
The other thing is that while the turbo's not in it's working range,
you're basically running a non-turbo engine, which (due to the turbo
being there) has a lower compression ratio, hence has less power.  I dug
out some more time logs for A, one for an N, plus some X's, will post
them over the weekend.

Cheers,
Craig.
-- 
Craig Haber
albatross@harnessnet.com.au
Manufacturing Systems Engineer (almost) 
Web Page Designer, Harness Racing, Railways, and Essendon Football Club
fanatic
http://www.harnessnet.com.au/