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Catch Cans

Baz

By Baz,
in Engines & Forced Induction

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sewid Grand Master

sewid

Posted
Posted

Well I got one and still looking for a place to mount it in the engine bay. I don't like the idea of running giant hoses over the top of the engine like so many cars in Japan do to place it in the washer bottle area.

Plus they are shiny and who doesn't love shiny things in engine bays?

JCMarshall_Law Proficient

JCMarshall_Law

Posted
Posted

Catch cans "catch" the oil as it is sucked out of the cam cover and before it is sucked into the induction system

Not having an oil catch can results in a few problems (none of them are life threatining)

1) The oil coats the inside of the induction system including the intercooler which reduces its cooling eficiency.

2) Oil burns in the engine and fowls plugs, and screws up the fuel mixture, although I can't really see how this will lean out the ratio as f1williams suggested - please explain. If oil is being sucked into the engine the A/F ratio will go down and the octain rating will go up. From the factory the scavaging system is closed loop, so no more air will get to the engine.

JDMfantasy Explorer

JDMfantasy

Posted
Posted (edited)

Well, like I already said.....my hoses are clear, that way I can see if any oil is draining out of them. ...and again, like I already said, there is anything draining, so I'm guessing the road is just fine. Guess no body reads posts anymore...

If I was pulled over, why would a cop open up my hood? We don't have all those strict rules and regulations where everything needs to be stock.

I've driven alongside the po-po countless times, never have I been pulled over, and the 4" downpipe on my supra exited right out behind my passenger wheel. They never seemed to mind :D

There are no idle problems, as long as you plug up the factory holes in the intake tract.

Bottom line is you do not need a catch can. If you live in lock-down land, and are worried about oil pouring out of the bottom of your car, maybe a catch can is for you.

Edited by JDMfantasy
Roy Grand Master

Roy

Posted
Posted
I was at Eastern Creek today and not a drop of oil went into the intake, car performed solidly all day...minus that exhaust gasket...curse that gasket...

Hey, Chris is it??? Saw/met you the other day at Eastern Creek.

The RB26 seems to breathe a little more then the RB20/25, but of course is very engine specific.

If you are looking to modify an engine, i think a catch can tells you a bit about the general health of your engine before you start winding in boost/bigger turbos etc. Pretty cheap and plenty of small reasons why they arent too bad an idea

Running the breather hoses straight under the car is silly, if you happen to be going full bore and have a problem...well i know id love to have hot oil spray all under the car, hell an oil fire from hot oil hitting a red hot dump pipe/exhaust , or even better spinning on the oil ... or having other road users spin on it, you obvioulsy dont happen to know many motorbike riders :P

It isnt hard or expensive to do right, so why not get it right the first time, also saves a film of crud forming over the underside of your car and engine bay, underside of bonnet etc

t01-100 Mentor

t01-100

Posted
Posted (edited)

Consider the oil you are running too. We used to use a Fuchs product in the track car, swapped to Motul of the same spec and now instead of filling up 300ml from a days racing we might get 50ml.

Edited by t01-100

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