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Installing An Oil Catch Can.

There is a lot of debate on whether an oil catch can is worthwhile on a naturally aspirated engine and there doesn’t seem to be any definitive answer. While it seems almost necessary to install one on a turbocharged engine, the arguments for installing one on a N/A engine are still compelling. These include:
-          maintaining the correct octane rating of your fuel without being degraded by engine oil (which doesn’t burn cleanly)
-          keeping the intake manifold, valve tops and cylinders clean.
I decided to install an oil catch can on the principle that even the people who say they are unnecessary, cannot point out any negative implications, while there does seem to be certain, specific benefits that make logical sense.
 There are numerous methods to retain the oil particles that pollute the inlet manifold and installing an inline fuel filter is a simple selection. I chose to install a substantial “canister” that is both cosmetically pleasing and has considerable capacity to reduce ongoing maintenance and future cost.
 So, it’s an easy install and here’s what you need if you want to follow my path of installing an aluminium oil catch can:
-          commercial “oil catch can”
-          1 metre of 12mm air hose
-          6 x hose clamps to suit above
-          1 x 8mm x 30mm bolt and nut
-          knife
-          cable ties
-          shifter / spanner to suit bolt.
 * Please note – I used clear hosing as I am interested to see the amount of oil that pollutes the hoses. I’m hoping to find the PCV valve to catch can hose become oily while the catch can to inlet manifold hose remain oil free. I intend to replace the hosing with more suitable hosing after a reasonable test period. I will post further information as available.




The catch can and fittings that came with it.



Hose and clamps. Please see note above regarding clear hose.



The existing hose running from the PCV valve to the inlet manifold. The catch can needs to be in this hose to prevent oil entering the inlet manifold.



Space is very limited in the engine bay for the catch can so I’m going to bolt it to the upper strut bar.  It fits snugly between the battery and the throttle body.

I bent the bracket as per the photo so it will work as a clamp when the bolt is installed.



There is a drain at the bottom of the catch can that I won’t be using. One bolt and two clamps and it can be pulled out, emptied and cleaned when the time comes.

I cut about 100mm (4”) of hose, doubled over one end and used a hose clamp to seal it off. The other end of the hose is clamped straight to the fitting on the catch can.



The catch can is installed and clamped to the upper strut bar using the 8mm bolt and nut.


  Cut one piece of hose long enough to go to the PCV valve and another to reach the inlet manifold. Use the hose clamps and install onto the catch can.



Remove the OEM hose from the PCV valve and inlet manifold. I recommend keeping this if you ever want to remove the catch can for any reason.


  Install one hose to the PCV valve using a hose clamp



And the other hose to the inlet manifold.



That’s it – done!


  ** The installation of clear tubing was a mistake but was correct for investigative purposes. The line from the PCV valve to the catch can quickly became dirty while the catch can to inlet manifold remained clean. This proves there is solid reasoning for the installation of this device.

The clear tubing rapidly deteriorated and collapsed due to the heat generated in the engine bay. This has since been replaced with more suitable hosing and I am happy with the installation of this modification.