BOV leak from seal around shaft???? Video

[BoostedBeaver]

This is a 1g BOV I bought from a member on tuners. I received the BOV and all seemed well. I bought this BOV to perform the Dodge Mode (Video to come), so I did just that. After modding the BOV I set up a little contraption of T's and hose to make sure everything was sealed up and to check the set screw in the bottom of the BOV to make sure it was sealed. During testing, I found that the BOV is leaking air out of the discharge tube when pressure is applied to the bottom nipple. This leak can be altered by moving the shaft side to side (seen in the end of the video) but never stoped. I know there must be a seal that goes around the shaft and I am guessing that this has went bad, but I am no genius and would like your advice.

1G Blow off valve leak... Not the usual kind - YouTube

 

[JusMX141]

It does indeed to have some type of leakage- however I'm not sure that amount of air bypassing the chamber is enough to cause any issues judging by how slowly the bubble forms. It may work just fine on the car.

At the same time, I wonder how many 1G valves are floating around out there with the same issue....and if it's not the diaphragm leaking, what is it?

 

[skatershawn]

Im on my third 1g bov that leaks.. i just dont understand it! One was crushed the other two were not!
At idle it will leak quite a bit, ( i have GM MAF and vented the BOV, but since i noticed the leak AGAIN i have it recirculating) so if at idle i can feel a pretty darn good amount leaking out, how does it hold up while driving or under boost??


Guess i just have to save up for a teil or something!
Actually looking at getting the forged because my UICP as 1g flange!

 

[PieEyedPiper]

I have 3 1g bovs and they ALL leak at the shaft. All of them leak so horribly it's embarrassing to roll down in gear if I'm in public. The BOV just howls like some sad bird as the big vacuum seen at decel takes advantage of the leak at the shaft.

 

[Bud92gsx]

I have a few 1g bov's floating around in my house somewhere..I've never had a problem with any of them leaking..(That I can tell)..

I have one that is crushed, the only thing that one did was flutter a bit..

 

[BoostedBeaver]

@ jusmx141 : There has to be some type of seal around that shaft to keep the pressure in the chamber below the diaphragm, or maybe it is an O-ring. I have another one (on the car now) and I am going to test it as well and will post up the results. From a regular boost leak test it seems to have the same problem.

@ skatershawn : Are your BOV's leaking at the shaft or being blown open at 18+ lbs. Just trying to see how many leak at the shaft.

@ PieEyedPiper : The one that is on the car now will make a high pitched screech when I decel to a stop. I am going to test it too and see how it goes. Is your BOV recirculated? How would vacuum make the valve slightly crack and make the noise that we hear? I see this being true just asking for a little more of your thoughts.

@ Bud92gsx : If you still have these BOV's laying around could you run some air through them and see what you get? If we test them off the car then there is no chance of pressure blowing them open. It does not have to be Garage modded, just use the compressor and add pressure to the hole in the bottom, add some soapy water, and see if you can blow bubbles. Also do not forget to turn the regulator on the compressor down to 25-30psi as 100+ psi would not be good for the BOV. This is just a mere suggestion so that we can get more info. If you have the time this would be great, If not we understand and thanks for your input on the subject.

 

[Bud92gsx]

I would love to test that for you..Unfortunatly..I don't have the equipment to do it....I'm a bearer of bad news I know..

I have tested a couple on the car and the crushed one did not blow open at 18psi..The one I have on the car now was fine up to 20..Boost creep was the cause for such high boost at WOT..No fuel cut either I must say..

 

[BoostedBeaver]

That is fine. I am sure others will check theirs and post the results. You can still test the one that is on the car just put 10-15lbs in it and see if you hear any air escaping. I would not spray such a large amount of water (like in my video) in the BOV, but a few suds would not hurt to check for leaks. Thanks for the help.

 

[Bud92gsx]

You must have not looked at my signiture..But I have a blown turbo right, now also....

 

[BoostedBeaver]

I was just giving you the benefit of the doubt and thinking that you did not update it. I will quit trying to get you to test the BOV and let you get your car back on the road. Good luck to you and I know you will be back boosting soon.

 

[Bud92gsx]

Soon..Well I'm actually thinking more like spring..I'm waiting for funds, and that won't be untill probably november..Which by then it''s be too damm cold outside to get it back on the road..

Ya I know my life sucks right now, but you gotta take it as it comes..

 

[agarc023]

So when one of these leaks, would it sound like a high pitched whistle or like squeeky brakes? Thats the sound I get but only when the car is over 20inhg

 

[skatershawn]

@ skatershawn : Are your BOV's leaking at the shaft or being blown open at 18+ lbs. Just trying to see how many leak at the shaft.
.

No, as i stated, it does it at idle, and when i do a boost leak test it will leak extremely quick through the BOV so i have to cap the end of the vent pipe to check my whole system for leaks!

So when one of these leaks, would it sound like a high pitched whistle or like squeeky brakes? Thats the sound I get but only when the car is over 20inhg

And this too.. its makes an insane whistling noise when i let off the gas at cruising speeds! Ill just be cruising down the road, not in boost, in vacuum, and when i lay off the gas it makes a weird whistling flutter! This happened to my 2nd one, but not to my 1st one which was crushed!

 

[BoostedBeaver]

@ skatershawn Sorry I misunderstood your first post. Thank you for clearing that up for me. Just by this thread it seems that this will be a problem that many will have, but some will not.

 

[PieEyedPiper]

So when one of these leaks, would it sound like a high pitched whistle or like squeeky brakes? Thats the sound I get but only when the car is over 20inhg

This is what happens to me.

What happens is the seal for the shaft gets worn every time the bov actuates. Over time the wear becomes significant and will make for this "squeal". Often, crushing will only make it worse as now the most worn part of the shaft is always depressed a little (due to crushing) and can make it so your valve has an even worse case of the howls.