19th December 2020, 19:35
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#7
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Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.
Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,380
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Quote:
Originally Posted by COLVERT
I thought, like Harry, the petrol engines used the inlet manifold vacuum.
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Hi Jon,
The vacuum pump ensures that the actuator is controlled accurately to maintain the pre-set road speed. Inlet manifold vacuum wouldn't work because it is directly affected by throttle position which would be adjusted by inlet manifold vacuum which would change the throttle position which would ...... you get the picture! It would be like a howl-round (acoustic feedback) at a rock concert! 
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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