Vacuum hose connected to alternator?
Submitted: Wednesday, May 23, 2007 at 17:04
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Dicko2
Hi
just wondering, why does my friend's 86 troopy have a vacuum hose connected to the back of the alternator??
Rich
Reply By: GerryP - Wednesday, May 23, 2007 at 23:11
Wednesday, May 23, 2007 at 23:11
A petrol motor controls the revs by adjusting the air flow - as said previously, by using a butterfly valve in the air intake. Downstream of the butterfly will be under vacuum, particularly when decelerating as the butterfly is then closed, but the cylinders are still trying to pump air in.
A diesel motor is opposite in that it is controlled by adjusting the amount of fuel to the motor. The air intake is completely open with no butterfly or any other form of restriction, therefore, no vacuum.
A very basic explanation, but I think it gets the idea across.
Cheers
Gerry
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