Oil catch tank - any recommendations?

Leeum · 27 Sep 2009 at 17:48

I like the look of the Mocal catch tanks - handy too as they have a breathable cap but don't fancy shelling out £100 for one.

Can anyone recommend me something cheaper. There's a crazy amount of them on ebay but I've no idea what's good and what isn't.

Cheers

Leeum · 27 Sep 2009 at 22:26

Just thought I'd post anyway as not all the ones on ebay are the same - some come with baffles and all sorts of crazy things. I'll just buy whatever is cheap.

Main reason I want one is to stop the sensors in the throttle body getting gunked up with oil again - car runs like crap when they do. I've also heard that the oil vapour going back into the inlet reduces the octane rating of the fuel... not sure whether there's any truth in that but if it keeps my engine a bit cleaner, I'll be happy.

Leeum · 28 Sep 2009 at 19:44

Westyfield2 said:
At OP, whether a Mocal one at £120 is any better than a Merlin's own and drill a hole for the breather at £85 is debatable!

Cheers for that.

My cam covers only have one hose that needs connecting to the catch tank, suppose I could connect a length of pipe with a breather filter (on the end pointing towards the ground) onto the other barb.

Leeum · 28 Sep 2009 at 20:39

Defcon5 said:
Do they still have to be plumbed into the intake system, to maintain the - pressure?

Seems to defeat the object a little bit as there's still going to be oil vapour going back in... albeit without the sludge!

My K&N induction kit has a moulded barb for the oil breather to connect to - will need to find a plug of some description to block it up.

Jonnycoupe said:
Why do you want one with a breathable cap? Or is it soley to catch oil than attempt to control crankcase pressure?

Handy in the sense that you don't need a breather filter for it. No doubt it would stink the cabin out though.

Leeum · 29 Sep 2009 at 21:29

I'm not touching the crank case breathers, just a single 90 degree barb on one of my cam covers. I see people running a breather filter on it all the time, so surely fitting a catch tank and breather filter won't do any harm?

Leeum · 29 Sep 2009 at 21:57

Hmm I see. Would a better option be to connect the outlet of the tank back to the inlet then?

Leeum · 29 Sep 2009 at 22:22

Not my engine bay but this was the kind of setup I was thinking of.

The outlet pipe of the catch tank just points towards the road to keep the smell out the cabin.

Leeum · 29 Sep 2009 at 22:56

I just didn't want any crap going back through the throttle body and gunking up the sensors to be honest!

Leeum · 30 Sep 2009 at 10:54

Matt82 said:
what sensors are inside your throttle body?

Air intake temp sensor, TPS (which actually reads off the spindle so guess that can't be affected by crap going in), there's a MAP sensor in the inlet manifold too. A gunked up idle control valve in the throttle body was the cause of a low speed juddering I had on cold starts.