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Thread: Pressure Testing valve placement

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Posts: 1-10 of 14
2011-01-04 00:33:07
#1
Pressure Testing valve placement
if I put #1 at TDC, all intake valves should be closed allowing me to pressure test the IC piping and intake manifold, correct? otherwise, how do I know when the valves are closed so the air doesnt just flow out the valves?
2011-01-04 02:01:51
#2
anyone?
2011-01-04 02:11:32
#3
When I did it, my exhaust wasn't hooked up. Just kept slowly turning the crank until I heard/ felt no more air through the dp elbow.

Maybe put a psi gauge on one of the vac lines coming from the intake to see if your maintaining pressure? That's what I did anyway to check the intake before I went on to check the ic piping. Just make SURE you have your air regulated!

First, I had some 1/8" piping laying around I used with a ball valve to make a sort of wand with a shut-off on it. I set my regulator to 5psi, charged the intake to 5 psi as read on the psi gauge, then closed the valve and watched the gauge to see if there was a leak.

That's just what I did....there maybe a better/easier way to do this.
2011-01-04 03:15:34
#4
I am not seeing ANY pressure build up on the boost gage, even connected strait to the throttle body, so I assume the air is escaping through the valves. I have never had this problem before, IIRC i just put it at TDC. I guess I can keep going through the strokes till I find a spot that seals?
2011-01-04 03:25:00
#5
How quickly is it escaping? Check your IACV, or any ports that go out of the IM.
2011-01-04 06:56:38
#6
Originally Posted by Vadim
How quickly is it escaping? Check your IACV, or any ports that go out of the IM.


easier said than done.... Its escaping fast enough that I cant tell where its escaping. Seemingly much faster than its going in through the valvestem. Thats why I suspect the valves are open.
2011-01-04 07:09:04
#7
Originally Posted by Will
easier said than done.... Its escaping fast enough that I cant tell where its escaping. Seemingly much faster than its going in through the valvestem. Thats why I suspect the valves are open.


I doubt it escaping from the valves. I mean if you want to be super duper in depth then take out the intake cam completely. BAM insta shut valves. But I'd pressure test the intake tract first then move onto the inatake mani and so forth.

Make sure to pressurize the bov as well other wise air will leak there as well.
2011-01-05 05:25:42
#8
I dunno where the air is going, I have never had this problem before. It's like the pipes are just wide open.
2011-01-05 06:23:07
#9
There will always be an inlet valve open all the time, you would need to remove or release the intake cam so the valves are all shut.
Try spraying soapy water on the piping, cooler etc and look for bubbles.
I normally do this on the dyno under boost but you could compress the intake or try boost it the stop and look for the bubbles
2011-01-05 08:40:41
#10
so there is no way to pressure test the intake manifold without removing the intake cam? I don't understand how I have been able to pressurize it in the past? I'm really not worried about my IC piping, it has never leaked before and I don't think it just started for no reason.
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