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Old 03-06-2010, 11:06 PM   #1
kh15
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Default remove oil cap to perform boost leak test?

should i remove my oil filler cap to prevent blowing out my cam seals when doing a boost leak test? i only plan on pumping in 16-17psi

if i should take the cap off wont air constantly leak out during the test?
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Old 03-07-2010, 04:09 PM   #2
kh15
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nobody
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Old 03-07-2010, 04:22 PM   #3
oncesir
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IIRC there is a FAQ about this very question. The writeup I recall reading mentions removing the oil cap to prevent the cam seals from popping out.

http://www.pandlmotorsports.com/misc...ehicle-1.2.pdf

This link refers to the procedure.
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Old 03-07-2010, 04:52 PM   #4
guiltyone311
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your not really suppose to run that much pressure through the inlet side i do 5 to 7 psi through inlet side and 25 psi off the coupling to the turbo outlet
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Old 03-07-2010, 10:46 PM   #5
kh15
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25psi! im only going to pump in about 15 or 16psi!
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Old 03-07-2010, 10:57 PM   #6
boogieboogz
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you don't need to take off the oil cap, just make sure to disconnect the PCV line from the turbo inlet. honestly, I don't even think you need 15psi. I didn't even reach 10psi before found my leak.
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Old 03-07-2010, 10:59 PM   #7
Want_To_Buy
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If you know how to weld then I suggest these!

Adel Wiggins Flexible Tube Connectors

http://www.importtuner.com/tech/impp.../photo_10.html

With the amount of boost needed to make 750 whp on a four-cylinder engine, intercooler pipes pulling apart was a concern. Rather than using standard silicone hoses and clamps, Naoto chose to use Adel Wiggins Flexible Tube Connectors (Wiggins clamps) on both the intercooler system, as well as the radiator pipes. Utilized by race teams, aerospace and the military, Wiggins clamps can withhold compressed air or fluids, and are tested to seal at greater than 125 psi, up to 450F and flex 3.5.

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Old 03-07-2010, 11:04 PM   #8
Want_To_Buy
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Yea you know this next picture doesn't make much sense to me but it has the clamps on it so lol....

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Old 03-07-2010, 11:07 PM   #9
SubiSam
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Don't even put that much pressure on the inlet pipe. Guiltyone311 is right. If you're only checking for boost leaks and not vacuum, I would connect the pressure to the y pipe, or cap off the y pipe and connect to a vacuum port on the manifold. But if you insist on pressurizing the inlet, take the oil cap off.
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Old 03-08-2010, 12:18 AM   #10
kh15
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Quote:
Originally Posted by SubiSam View Post
Don't even put that much pressure on the inlet pipe. Guiltyone311 is right. If you're only checking for boost leaks and not vacuum, I would connect the pressure to the y pipe, or cap off the y pipe and connect to a vacuum port on the manifold. But if you insist on pressurizing the inlet, take the oil cap off.
do you need to vacuum test a turbo car? I would assume if its leaking under boost its leaking under vacuum
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Old 03-08-2010, 12:50 AM   #11
SubiSam
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Quote:
Originally Posted by kh15 View Post
I would assume if its leaking under boost its leaking under vacuum
Not necessarily, but I don't mean put a vacuum on it. I mean pressurize the system by using a vacuum port. You would use the same method to find a vacuum leak. If you suspect a leak at the inlet pipe, you can pressurize it too, but I would not apply too much pressure there.

And yes air will leak out of the oil filler if you pressurize the inlet. The pressure will go from the inlet into the breather lines to the crank case and out of the oil filler, so if you are pressure testing the inlet, it wouldn't really do any good to just remove the oil cap. I would cap off the breather connections on the inlet if you are looking for a leak there. It will also leak past the rings into the crank case, but with the breather lines disconnected it will just vent there. My point is, you do not want to pressurize the crankcase and you do not want to over pressurize the inlet because they are usually especially weak around the turbo connection.

Last edited by SubiSam; 03-08-2010 at 01:04 AM.
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