Reccomended oil catchcan 4 4age

[method]

Having no oil catch can also lowers the octane rating because all the crap gets mixed with the air comming in. So its a good thing to have on high compression or turbo cars.

Probably helps fuel efficency a little too.

I guess its illigal to have no catch can? Just a pipe dumping it somewhere in your engine bay

[gordon77]

Having no oil catch can also lowers the octane rating because all the crap gets mixed with the air comming in. So its a good thing to have on high compression or turbo cars.

Probably helps fuel efficency a little too.

I guess its illigal to have no catch can? Just a pipe dumping it somewhere in your engine bay

lol yeah i spose there would be some rule about it somewhere. they would definatley not let you on any sort of race track...

[2LTR Rona]

I guess its illigal to have no catch can? Just a pipe dumping it somewhere in your engine bay

Dont know about the legality of that but I for one sure as heck wouldnt like to be following you on the road

[RedMist]

There are two concerns in venting to atmosphere.

1. vaporised oil is highly flammable. Bang, and burn.

2. Negitive crankcase pressure. Definately on cranking and possibly with engine braking you draw back air through the breathers. IE you draw whatever shit has collected in the sticky breather tubes back into your engine. Hence I run K and N on my breather tank as well.

In regards to added performance... I wouldnt think so, you may be able to advance the ignition slightly with venting to an external breather tank, but I doubt it. External breathers are only really good on engines that push a lot of oil out the breathers. For production engines this simply points to a failure in either design (as in the bigport 16 valve) or abnormal wear (such as ring blowby)

I'm forced to run one as my 16 valve race engine runs at 6-8.5k RPM all day and doesnt have a sufficient return. I think you are wasting both your time and money putting one on a road car.

[matt dunn]

i too am looking at getting one. not meaning to hijack this already hijacked thread but what size is recomended???

From memory msnz require more than 1 litre I think?

[wde_bdy]

Depends on purpose.
For Motorsport NZ use you need a 1L can sub 2L engine or 2L can over 2 L engine size.

Callum