second breather - what should it do

M

monka

Member +
right, not the pcv valve, the one nearer the cam cover,

what should it be doing on idle, revving, boost etc, sucking, blowing, or what?

cheers
 
TurboDave

TurboDave

Member +
The pressure you feel coming out of the breather is caused by the air in the engine being pushed around as the pistons go up and down, so if you feel it at tickover you should feel it blowing slightly in pumps.

Under boost there will be more air coming from the breather because the older engines cant fully seal the boost in the cylinders so some escapes.

Increased RPM = air being pushed around at a faster rate and more air from the breater.

When you get cracked pistons most of the pressure escapes and causes excess air and oil mixture being blown from the breather.
 
TurboDave

TurboDave

Member +
It should be sort of sucking and then blowing but the interval between will be very short and probably feel more like a blow!
 
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