What is a catch can?


Similar Questions:
What is a breather filter?

A catch can is a small container, sometimes with a filter, that collects oil blown out of the PCV valve or valve cover intake hose. The idea is to keep the oil out of the intake, which helps keep the intercooler running at maximum efficiency. It has also been reported that the catch can mod can reduce the crankcase pressure, helping to eliminate the problem of having the oil dip stick pop out of the engine. It is necessary to periodically empty the catch can to prevent it from overflowing. Some cans provide a drain for this purpose.

UPDATED: Much of the issue is due to positive crankcase pressure pushing oil into the intake. If you PCV valve is ok and everything else looks good, read up on Jack's Transmissions PCV article. Very interesting. 

Other people have installed a K&N 'breather' filter in place of the stock hose. The filter allows gases to escape but keeps liquid oil inside the block, thus providing the same benefit as the catch can without requiring maintenance. Many believe they are too restrictive, but people have used them with good results. Unfortunately, the breather filter can sometimes allow oil to escape and get onto the engine. We recommend you avoid this method.

 

 

 

QA #68

Last Updated:
2016-05-30 09:05


Cam Dorland | 95 Eagle Talon
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