Oil Catch Can Splatter

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SLR No.77
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My catch tank was originally the standard "race" setup, ie. engine vented to catch tank, open breather vented in the engine bay. Not great for a road car though because you're breathing in the vented fumes which I believe can be carcinogenic and you're spending much longer in the car that you normally would in a race car.

I've found that running with a sealed catch tank, venting from the engine to the tank then venting from the tank to under the car improves this dramatically. Even better when I ran the tank vent fully to the rear of the car.

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Graham Hutton
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Thanks everyone, I'm just going to get rid of the breather pipe and put a bung in the top with a little breather hole like Tim's and see how it goes. Awesome!

Exeter, Orange 310R

Shortshift
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"Even better when I ran the tank vent fully to the rear of the car."

This is exactly right.  And easy to do with an appropriate length of 1/4" (or whatever) oil resistant tubing.  Mine vents behind the rear axle.

Another problem with allowing the can to vent/breathe underbonnet is that everything ends up covered in a thin, slimy film of oil mist.  Yukky-pooh...

Venting rearwards (is there any other way?) avoids this, as well as the ingestion of carcinogens.

James

 

Graham Hutton
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Is it really necessary for the can to be vented at all? If the crank case pressure is simply fed into the inlet manifold surely it'd all equal out....or would the catch can explode??? I take James' point about routing the pipe to the back of the car though

Exeter, Orange 310R

7 wonders of th...
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I use one like this

https://www.ebay.co.uk/itm/362906628652?mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338703917&toolid=20006&customid=s%3AGS%3Bgc%3AEAIaIQobChMIr4O-9MnB9wIVz9vVCh0fUgDnEAQYASABEgKu9PD_BwE

Theres an internal baffle, and you can offset the inlet and oulet, I run mine on the same side, the outlet is vented along with the gearbox roughly half way along the gearbox, no issue with nasty niffs.

although these come with different sized barb fittings You can easily get adaptors to enable you to couple to JIC ot BSP if you run a DS set up.

Drain either by the drain plug or with a syringe if your restricted for height on your installation.

Beagler
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Thought I would replace the plastic bottle with one of these. Anyone fit it.

https://www.amazon.co.uk/gp/product/B01L3M8L86/ref=ox_sc_act_title_1?smid=A3P5ROKL5A1OLE&psc=1

 

Mishimoto Compact Baffled Oil Catch Can 

Defend Your Intake 

The internal air diverter turbulates the air longer and ensures all the oil sinks to the bottom of the can, leaving nothing but clean air to pass through the 50 micron bronze filter to the intake. 

Safe for pressurized applications 

Internal air diverter turbulates air longer to improve oil separation 

Includes 2 plastic barbed 1/2" hose fittings 

Universal mounting bracket for different configurations 

Filter and can are both fully serviceable

 

2019 310S 1.6 Sigma

GulfSeven
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It's very similar to the one I have on my Fiesta ST (this one).

It's unvented though, so I'd want to know why the Caterham needs a vented one before I fitted something different.

Tim.

Gulf Racing 310R

Graham Hutton
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Another possible solution, which may be even easier is to stick a K&N crank case breather filter like this one on the outlet pipe. That should stop the splatter I guess.

https://www.demon-tweeks.com/k-n-filters-breather-filter-244153/?sku=K/N62-1000&istCompanyId=a2904180-3a7d-4e56-b876-cf81c9512180&istFeedId=6fbc4b04-fd28-4ce1-8513-835c8f118690&istItemId=wptwlplqx&istBid=t&gclid=EAIaIQobChMI_pi14uDC9wIVi7TtCh0L8guNEAQYAiABEgLM0PD_BwE&gclsrc=aw.ds

Mind you a nice piece of alloy bling for a catch tank is quite appealing.

Exeter, Orange 310R

Beagler
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I think the brass filter insert and good circulation within the unit filters out splatter and retains it in the can so very efficient filtering means no external splatter hence no vent required.

2019 310S 1.6 Sigma

Beagler
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2019 310S 1.6 Sigma