Oil Catch Can Splatter

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Graham Hutton
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Oil Catch Can Splatter

I wonder if anybody else suffers from the same issue as me with my catch can. I built my 310R just over a year ago and routed the outflow pipe from the catch can down so it exits below the bottom chassis cross member. But ever since the start it has always splattered a bit of oil down the underside of my car and there is always a little drip when I park up. It is not much but enough to be irritating.

There is also always a little bit of oil that splutters from the vent hole in the rubber plug on the top which makes the inside of nearside chassis skin get misted in oil.

I reficed it with the internal pipes cut short as I was worried that the breathing was causing some sort of bubbling in the little bit of oil which is in there but it has made no difference.

Any thoughts from anyone on this. Perhaps I am being a bit anal about it but I don't like things being oily. The Sigma engine is running fine, with no oil consumption and has only done 3000miles.

All thoughts welcome.

GulfSeven
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On my 2020 Factory 310R the outflow hose goes back into the inlet manifold. I guess on the Ford Sigma install (on a Fiesta or Focus) there is just a direct hose between the crankcase and the inlet. I don't get any oil coming out of the breather plug on the top of the can either.

I actually fitted an oil catch can to my Fiesta ST, replacing the PCV hose between the crankcase and the inlet. In that case the can isn't vented. It's actually a much neater install than on the Caterham, with a very small aluminium can containing baffles and a bronze filter. It's a lot more expensive than the system fitted to the Caterham though.

Tim.

Gulf Racing 310R

Graham Hutton
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Thanks Tim, that's very interesting. It does seem quite unsophisticated on the Caterham (perhaps not surpisingly) and I guess all engines have slightly different crank case pressure etc. Maybe mine is bit higher than most.

 

Exeter, Orange 310R

GulfSeven
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If you want a look at mine you're welcome. I've actually got the bonnet and nose off at the moment, so if you wanted to compare we could do a video call today. Direct message me if you want to have a look Thumbup

Tim.

Gulf Racing 310R

Graham Hutton
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Thanks Tim, that's very kind. I'm not at home at the moment but could be around later? Alternatively, could you send me a pic of the route of the pipe from the outflow to the inlet manifold? Top man

Exeter, Orange 310R

Beagler
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I had my 270 uprated to 310 when having some warranty work done at CC. They fitted a catch can. There are two pipes going in and none exiting. I think the idea is you empty it when getting full. I prefer to this rather than have oil dripping on the ground. 

2019 310S 1.6 Sigma

GulfSeven
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Here you go.

I've marked the hose going from the crankcase to the can as C, and the hose going from the can to the inlet manifold as I.

You do indeed empty the oil out of the can, but as far as I understand, the air goes from the crankcase to the inlet manifold via the can. With a catch can the oil gets (mostly) removed before the air goes back in to reduce carbon deposits on the inlet valves.

Tim.

Gulf Racing 310R

Beagler
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Mine looks like that that CC fitted.

2019 310S 1.6 Sigma

Graham Hutton
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Tim - That is so very helpful, much appreciated!

On my car, the setup is identical except the rubber bung in the middle of the top of the catch can has a pipe coming out of it which drains out the bottom of the engine bay. Looks like all I need to do is replace the drain with a bung. Does your bung have a breather hole in it or is it literally a bung in the top which you remove when emptying the can?

Thank again - looks like I'm off to get oily!

Exeter, Orange 310R

Graham Hutton
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This is the offending item on my car 

https://caterhamparts.co.uk/oil-system/361-catch-tank-1-litre.html?search_query=catch+can&results=46

I had to drill the holes for the two breather pipes to go into it.

Exeter, Orange 310R

GulfSeven
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The bung on mine has a few very small breather holes in it. It also doubles as a drain plug which you remove when emptying the can.

Tim.

Gulf Racing 310R