Date: Sun, 07 May 2000 16:47:33 +0100 From: Johannes H Andersen <johsnopsamsafish.com> Subject: Re: New Saab Engine
Scott Nelsen wrote: > > Well, like I said I didn't get some of the stuff in the article. I was thinking normally > aspirated in the sense of "non-turbo-charged". What does the compressor do? > The compressor does much the same job as the turbo, but it is driven mechanically rather than by exhaust gasses. The advantage over a turbo is that boost is available immediately at lower rews while the turbo has a slight lag. On the other hand, the turbo uses "free" thermal energy from the exhaust gasses. Compressor technology is very old, the famous Bently Blower from the 1920'ies used a compressor. Also popular in piston engined fighter planes since the reduced pressure at altitude could be overcome. Johannes