I have the accurate machine works catch can. I never observed it while the motor was running untill the other day. I heard this hiss and traced it to the catch can. I checked for leaks but found none.
Just curious? Anyone else?

 

one time I drained mine (with the engine turned off) and mistakenly fully opened the drain petcock instead of fully closing it after I was finished. It can whistle really loud and be hard to pin down where it is coming from. Yes it should have been easy to figure out on mine but I had also just smoother the TB at the same time... I was sure that I had a vacuum leak from the TB gasket. Nope... just the damn catch can

 

where is a good place to get a GOOD catch can? right now i'm using a water seperator for a air compressor

 

Here is the link to Accurate Machine Works catch can, the one that therock has. http://www.accmachtech.com/pcvcatchcans.htm

 

mine did that when i first mounted it. found out i had the hoses swapped around. put them on correctly and no more noise.

 

there all out of stock. what other brands are there and are they any good.

 

Help me out here. Now I followed the directions but where do you have the line from the valve cover connected to the can?

 

i had the top hose going to the pcv valve and the bottom one to the intake. if that is how you got it switch them around and see what it does.

 

...and see. I do not have a pcv valve but a fixed orifice, I believe they started doing that in 03 or 04. This may be the source. I hear Vettes with no can make the same noise but a bit louder.

 

Well I went to their Site and itlooks like you stopped thenoise but rendered the can ineffective. Better put up with the noise and catch the oil.