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Old 06-04-2007, 02:02 PM   #1
akira02rex
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Default Perrin atmospheric bov leaking

Has anyone used this bov? If so, chime in here.
Today I decided to pressure check my boost piping.
I found out that there is a somewhat bad leak at the bov where the piston seats into the body.

Any suggestions to fix this? I can tighten the bov with it's adjustability, but I tried screwing the cap on a couple turns and it made no difference.
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Old 06-04-2007, 03:18 PM   #2
Rexwagon03
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yeah i had one too. mine leaked as well, i got rid of it.
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Old 06-04-2007, 03:33 PM   #3
12SECWAGON
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You're probably tired of hearing this, but go back to a bypass/recirc valve.
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Old 06-04-2007, 07:59 PM   #4
AlboWRX
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Well if you think thats where the leak is, I would pull it out and make a fitting for it so you can test it with some pressure to see if it really is the bov!
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Old 06-05-2007, 09:16 AM   #5
akira02rex
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Quote:
Originally Posted by 12SECWAGON View Post
You're probably tired of hearing this, but go back to a bypass/recirc valve.
Yeah..because the stocker can hold 20psi+ right?
I'm running a 20G with high boost.
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Old 06-05-2007, 11:15 AM   #6
akira02rex
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Ok, another question...

If I tighten down the cap more, will that make the piston seat tighter?
I read Perrin's installation instructions and they said the cap does NOT make the piston hold more boost...how is that possible??

I am looking at how it's designed and it seems as though when I'm in boost the volume above the piston is pressurized w/ boost that would equalize out the pressure under the piston (inside the tmic).

There is a rubber O-ring that is placed on the body where the cap screws on and it is cracked. If this O-ring is cracked then that will definitely give me a boost leak and thus, the pressure is no longer equalized above the piston and below the piston anymore.
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Old 06-05-2007, 06:57 PM   #7
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Change out that o-ring if you can. Just take it to a big hardware store you know and tell them to get you a similar o-ring. Also make sure to lube that o-ring up. That`s probably the reason it cracked.

If you tighten the cap more, it should hold hold more boost. That`s why they have it there to adjust in the first place!

Try to take out the valve and hook up the small nipple to a compressor with a gauge and put about 30psi in it. Put soap bubbles on it to see if there`s any tiny leaks. It wouldn`t hurt the bov in any way. If the compressor is not available you can maybe get one of those ball inflators.

Or you can skip all the above and just swap out your valve with someone else`s in your area.
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Old 02-19-2013, 11:24 AM   #8
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Quote:
Originally Posted by AlboWRX View Post
Change out that o-ring if you can. Just take it to a big hardware store you know and tell them to get you a similar o-ring. Also make sure to lube that o-ring up. That`s probably the reason it cracked.

If you tighten the cap more, it should hold hold more boost. That`s why they have it there to adjust in the first place!

Try to take out the valve and hook up the small nipple to a compressor with a gauge and put about 30psi in it. Put soap bubbles on it to see if there`s any tiny leaks. It wouldn`t hurt the bov in any way. If the compressor is not available you can maybe get one of those ball inflators.

Or you can skip all the above and just swap out your valve with someone else`s in your area.

To be clear tightening this BOV does not allow it hold more boost. It actually adjusts when it blows off. The tighter it is the more you would have to let off throttle for it too blow off. If really loose the valve would open instantly by even slightly letting off the throttle. The benefit of tighter is holding more boosts between shifts. Drivability could suffer if you go too tight or loose, perrin says the way it comes from factory is the most ideal. These are supposed to hold 200ish psi from factory, if you are leaking check install and the o-ring mentioned above.
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