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Date: Thu, 08 May 2003 01:55:31 -0400 From: Copernicus <arpicnopsammail.com> Subject: Re: Okay, why?
On 6 May 2003 17:36:47 GMT, davehinznopsamcop.net wrote: >Someone who looks an awful lot like Paul Halliday <pjghnopsamyonder.co.uk> wrote: >> Okay, so the classic 900 heat vent control is powered by vac and has a >> canister to hold vac when the car is in turbo. Why? Why not use a mechanical >> setup, or an electric powered motor? > >Well, vacuum servos were part of Saab back as far as at least 1971, so Vacuum servo is erroneous. A servo is an electric device in which two coils each containing a permeable slug are in the same electrical circuit. If one slug is moved by an external force (say a hand operated positioned) the other slug will move to correspond with that repositioning. Malcolm
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