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Old 04-08-2011, 02:49 PM   #1
ssmike
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Rx Catch Can hissing sound

For those of you with the Rx Catch Can, is it normal to hear a pretty loud hissing sound coming from the hoses to the catch can. Sounds like a vacuum leak. It is definatly the sounds of the gasses moving through the hoses in and out of the catch can. The sound goes away if I open the drain petcock but of course you can't drive it that way and it defeats the purpose. So with it closed and under normal operating conditions and engine is warmed up the hissing can be quite loud.

SC2150 says "if properly installed you should not hear any abnormal noise or sound". I double checked the install and I definatly have the hoses hooked up properly. I also removed the valve fitting and installed a non-valve fitting that he sent to me, no difference. Please advise!
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Old 04-08-2011, 03:00 PM   #2
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For those of you with the Rx Catch Can, is it normal to hear a pretty loud hissing sound coming from the hoses to the catch can. Sounds like a vacuum leak. It is definatly the sounds of the gasses moving through the hoses in and out of the catch can. The sound goes away if I open the drain petcock but of course you can't drive it that way and it defeats the purpose. So with it closed and under normal operating conditions and engine is warmed up the hissing can be quite loud.

SC2150 says "if properly installed you should not hear any abnormal noise or sound". I double checked the install and I definatly have the hoses hooked up properly. I also removed the valve fitting and installed a non-valve fitting that he sent to me, no difference. Please advise!
I've not gotten around to putting my catch can back on after installing the straight through fitting. It seems odd that it would make that hissing sound with the new fitting. Perhaps the can is simply amplifying the normal sounds.

Mine other setup didn't do this and I'm wondering if filtering through the stainless mesh stopped it?
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Old 04-08-2011, 03:13 PM   #3
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I don't think it's the can itself but the hoses! I can grab ahold of the hoses and make the hissing change pitch and if I squeeze either one (pinched closed) the hissing stops cause I'm stopping the gas flowing in the hoses. Lee, if you get a chance can you try yours? Mine doesn't start hissing untill after the engine is warmed up if that helps!
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Old 04-08-2011, 03:15 PM   #4
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Mine does the same as you describe.Thought it was a vacum leak also.

Nope,it's all good.I pinched the hose and the sound went away leading me to believe it is just the high vacuum at idle going through the orafices inside the can.

Maybe the sound gets amplified.So to answer your question I don't know if it's normal.
I can say though it works very well trapping oil.I'm not really worried about it.
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Old 04-08-2011, 03:20 PM   #5
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I installed mine a couple of weeks ago along with the oil cap/breather and it is also noisy, intermitantly. Hooked up correctly and even clamped the ends, which isn't even necessary apparently.
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Old 04-08-2011, 03:21 PM   #6
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I don't think it's the can itself but the hoses! I can grab ahold of the hoses and make the hissing change pitch and if I squeeze either one (pinched closed) the hissing stops cause I'm stopping the gas flowing in the hoses. Lee, if you get a chance can you try yours? Mine doesn't start hissing untill after the engine is warmed up if that helps!
I've ordered some parts to make quick disconnects for the hoses. Looks like they were delivered today. Honestly though, I had decided to leave the can off. I'm almost to a burnout point messing with it. I'll see what I can do.
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Old 04-08-2011, 04:25 PM   #7
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Make sure the valve at the bottom is closed! I think those have to be turned all the way OUT to close them.
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Old 04-08-2011, 04:28 PM   #8
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I saw another post about this a while back and that was the fix. Mine is being shipped so I can't personally atest to this being the problem. I think the valve works like a radiator drain though.
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Old 04-08-2011, 04:35 PM   #9
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I had the hissing. I carefully pushed the hoses a litte further onto the 2 fittings and mine stopped, thankfully!!!
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Old 04-08-2011, 05:10 PM   #10
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My drain valve is colsed and hoses all the way on! The earlier thread was about this same issue and I thought the drain was open so I thought I closed it and the hissing went away. Problem was that now it was really open. I discovered it when I removed the can and blew into the input and felt air come out of the drain. So, I re-installed it, closed the drain and HISS! If this ends up to be normal I'm pulling it out and returning it! It is quite loud and can be heard with the hood closed and idling and is very annoying. It really irritates me when you install a performance mod and it makes noise, or squeeks, or hisses, or causes another problem!
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Old 04-08-2011, 06:17 PM   #11
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Just got back from a short run and my can is making quite a racket. It is not a hiss, it sounds more like a dry bearing turning. Perhaps it is the check value vibrating??? Like one of the previous members, I too am not impressed. You can hear the noise in and outside of the car while running. Hoses are all tight, in the right fittings and the drain valve is turned out all the way out (closed). I will be sending SC2150 a PM as he has not chimed in on this most recent thread.
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Old 04-08-2011, 06:47 PM   #12
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Yeah, I ordered one, they said it's on it's way. If this is the way it is going to run, It's not even getting opened. It's going back!!!!!

They told me yesterday that there moving to a bigger shop right now and are bussy moving. Hope they reply to this problem!!!!! SOOOOON
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Old 04-08-2011, 06:54 PM   #13
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Has anyone tried unscrewing the fittings and wrapping them with tephlon tape? That might help? Just a thought.

I sent them a PM to respond to this thred!
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Old 04-08-2011, 07:02 PM   #14
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There were no leaks, hissing, or rattling following the install of my RX catch can. It's been on a few thousand miles now, and still no abnormal sounds from under the hood.

Just another thought, I don't have the breather cap. If you have one, try running without it (replace w/ OEM oil cap of course!) and see if the problem continues.
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Old 04-08-2011, 07:10 PM   #15
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Did the teflon tape on the screw fitting (it was leaking oil until I did) and I don't have an oil filler breather.

TAPSHIFT, I replaced my checkvalve fitting with a non-valve piece that SC2150 sent me because of the rattle you're speaking of.
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Old 04-08-2011, 08:30 PM   #16
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Mike, the part(s) taht came in was a crank position sensor for my sons Grand Prix and not the quick disconnects I thought. Segway to a plug. Patrick at GMpartshouse is great to deal with.

Anyway Mike, where did you mount your catch can? Mine wouldn't fit as designed so I mounted to the top bolt on the radiator using the RX bracket. If it's a harmonic vibration in the hoses perhaps zip tying the two together may provide a cancelling effect.

I have to say the can catches a very high percent of the total oil going through the system.

fwiw. Tracy fixed me up with a 1/4 turn ball socket valve. Mine is definitely closed.
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Old 04-08-2011, 08:40 PM   #17
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My can is mounted where it is intended to go on the passenger side with the supplied bracket. I tried zip tying the hoses together, no help!
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Old 04-08-2011, 08:56 PM   #18
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Guess I should have gone with the Elite Engineering Catch Can for the couple bucks more that it cost. Looks like it's built better, I just liked the idea of the drain in the bottom like RX has.
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Old 04-08-2011, 09:00 PM   #19
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Use a piece of garden(or any) hose to pinpoint the leak. Hold 1 end to your ear and move the other end around the area making the hissing noise. Where it is the loudest hiss is where you have a vacum leak and should be fixed asap. Just my 2 pennies.My catch can makes 0 noise.
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Old 04-08-2011, 09:41 PM   #20
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I did just that and the hissing is coming from the hoses. I inspected the hoses and they're fine, no holes. The sound seems to be from the gasses flowing through the hoses not leaking out of them.
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Old 04-08-2011, 09:44 PM   #21
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I definetly do not have a vacum leak.

I dont know why it makes noise now.I don't recall it making noise before.
As said,it doesn't really do it much when cold.

It is kinda a rapid gurgle sound.My can is empty of oil though.

I still don't think it's a problem as long as there is no Vacum leak.
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Old 04-08-2011, 09:46 PM   #22
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Guess I should have gone with the Elite Engineering Catch Can for the couple bucks more that it cost. Looks like it's built better, I just liked the idea of the drain in the bottom like RX has.
I chose the Rx over the Elite because I know the Elite uses a mesh screen inside and I worried about it getting clogged up. That and the price. I started this thread not to bash Rx or Elite but to try to get to the bottom of what's causing this annoying hissing and to see if anyone else was experiencing this. I truly believe in the technology and purpose of using a catch can and really want this thing to work!
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Old 04-08-2011, 10:00 PM   #23
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I chose the Rx over the Elite because I know the Elite uses a mesh screen inside and I worried about it getting clogged up. That and the price. I started this thread not to bash Rx or Elite but to try to get to the bottom of what's causing this annoying hissing and to see if anyone else was experiencing this. I truly believe in the technology and purpose of using a catch can and really want this thing to work!
I agree.
I'm sure both cans work great.I have had mine awhile now.
Drained for the first time 2 weeks ago when I changed my oil.
That is when I payed more attention to it and noticed the noise.
Pulled to the side of the road one day to check and make sure it wasn't leaking oil or anything after the first drain.
I was like,"what the hell is that noise"
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Old 04-08-2011, 10:41 PM   #24
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I definetly do not have a vacum leak.

I dont know why it makes noise now.I don't recall it making noise before.
As said,it doesn't really do it much when cold.

It is kinda a rapid gurgle sound. My can is empty of oil though.

I still don't think it's a problem as long as there is no Vacum leak.

Does it gurgle constantly, or when the engine is under load i.e. accelerating?
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Old 04-08-2011, 10:51 PM   #25
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Does it gurgle constantly, or when the engine is under load i.e. accelerating?
I don't know.I have only heard it when idleing, and yes it is a constant sound.
Can't hear it inside the car at all.
I would assume under accelleration with low vacum it would not make any noise.
I guess I could have the wife rev it while I observe,but that would not put much load on the engine.

It defineatly is really wierd.
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