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pressure thrue crankcase ventilation

Jona$

Master
Joined
Sep 27, 2010
Messages
568
Location
Northern
Country
Sweden
Snowmobile
Tapex/sks 800 -16
was pressurizing my in and out to check for leaks and all i could hear was that when getting to about 1bar after a couple of seconds when doing in it started gurgling/hiss not alot but did.

Is that normal or are my pistons or any done?

sled works fine except for 10.5afr at 10500rpm
 

I have read this at many places, and is that right this is then normal.

If your pressurizing the motor as well are you making sure that all intake valves are closed during the pressure test. Cuz usually at least one intake valve will be somewhat open anywhere on the cranks location. So all your getting is pressure past the rings which is normal Its never going to seal completely.
 
You did a leak Down test I assume.

You have to position the piston of the cylinder you are intending to measure at the TDC - top dead center. Then repeat that on the NeXT cylinder, and so on. Done this way, ideally no valves will be open when testing.
Using a stetoscope to listen to the motor helps a lot when trying to figure out where the air is leaking out. Doing a leak Down you are supposed to pressurize the cylinders at 100 lbs. Then measure the pressure drop after a given time interval.
 


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