The servo clutch used an electric switch that supplied manifold vacuum via an actuator valve to a reservoir that disengaged the cluch.
12.
Like a diesel engine, manifold vacuum is practically non-existent in these engines and a different source must be utilised to power the brake servo.
13.
Manifold vacuum is an effect of a piston's movement on the auxiliary power source to drive engine accessories and for the crankcase ventilation system.
14.
See manifold vacuum, which I think covers engine braking better than engine braking .-- talk ) 15 : 44, 9 July 2008 ( UTC)
15.
Some vacuum advance units have two vacuum connections, one at each side of the actuator membrane, connected to both manifold vacuum and ported vacuum.
16.
The windscreen wipers were powered by the inlet manifold vacuum; when the engine was working hard, the vacuum fell away and the wipers slowed or stopped.
17.
"' Manifold vacuum "', or "'engine vacuum "'in an internal combustion engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere.
18.
This valve senses the sharp increase in intake manifold vacuum resulting from the sudden closure of the throttle, and diverts the air pump's outlet to atmosphere.
19.
On earlier versions of the system, a MAP sensor was internal to the ECU, requiring that an inlet manifold vacuum line be run to the ECU enclosure.
20.
This causes a high manifold vacuum which the cylinders have to work against-this saps energy and is where the majority of the engine braking force comes from.
