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How to: Install a Oil Catch Can

Your car has a crankcase breathing system known as the PCV (Positive Crankcase Ventilation) system.
The purpose of this is to vent oily gases from your engine, these gases are usually fed back into your intake manifold and back into your engine but this has the effect of lowering your fuels' octane level slightly and leaves a black sludge inside your intake manifold. Put your fingers through the throttle body and you will see what I mean.

The purpose of the catch can is to trap the oil while letting the clean air continue to the engine, once the can is full you can tip it out somewhere safe.

Making your own oil catch can it actually pretty simple, all you need it a can of some description which can hold a vacuum without collapsing or leaking.
The can I used is an aluminum drink bottle, it does the job perfectly as it is made for holding liquid.
It's really just a matter of drilling two holes and gluing in two male hose lines, making sure it is sealed properly.
I made a mounting bracket using a hose clamp and this works perfectly.


The gases are vented through the PCV valve which is located on the intake manifold down below the fuel rail. You will need to remove this which can be a bit tricky, just use a pair of pliers and keep wiggling carefully until it comes out. Try not to break it, they cost a ridiculous $75 NZD to replace.
Give it a clean out with a bit of petrol, it should rattle when you shake it.
You'll need to decide where you want to mount it and buy enough hose to reach.

The (crappy) pic above shows where I mounted it, there's a reasonable amount of space there. You need to attach one end of the hose to the PCV valve (shown by the yellow hose) and re install the valve into the intake manifold, connect the other end of that hose to the catch can. You need to run the other hose from the other side of the can to the place on the intake manifold where the PCV hose originally went (shown in pink in the pic). So basically, you are placing the can in between the original hose, from PCV to can  then from can to intake manifold.

Above is a picture of the PCV valve with the hose connected, note that yours will be a right angle valve, mine is straight because part of it broke off. It still works fine though and it's actually easier to route the hose that way. Start the car and check for leaks, any leaks will probably result in an unusually high idle.


I now have a stainless steel catch can made by a fellow New Zealander, the installation is the same.



This website has been gradually growing since I started it in early 2002. Originally I was simply documenting modifications and repairs to my car but I decided to publish it when I began to discover others were interested in the information. If you need help or have a how-to relating to Honda B series VTEC engines, or DA or DC2R Integras you can
email me

While all care is taken to provide correct information, mistakes are occasionally made and I cannot be responsible for any damage that occurs to readers vehicles.