Carbon8

iTrader: (4)

Hey guys

Stumbled across a DIY thread for an oil catch can, and i understand the purpose and functionality and agree it is a great idea to install one but I cant seem to find an answer to what seems to me is a simple question. Why is blow by or overflow oil even routed to the intake to begin with???

Thanks

kma5783

iTrader: (7)

Because it's meant as a "Crankcase" vent, blow by is not technically supposed to occur, but it does...Usually it's a result of over filling the oil or adding oil too fast, it can also occur while tracking the car.

Carbon8

iTrader: (4)

Wouldn't it make more sense to vent it to atmosphere, just doesn't make sense auto manufactures know that potential blow by can occur why vent it to a potential hazard.

Slidin8

because of emission laws

Carbon8

iTrader: (4)

Since when do we follow those laws, there should be new standards of emission laws for Wankels
none sounds acceptable

kma5783

iTrader: (7)

No, under normal conditions it shouldn't occur, and that's what a manufacturer is concerned with.

Venting to atmosphere would equal oil all over the engine bay.

Venting it with just a filter like some have done here would equal an easily clogged vent and for the average owner that's no good.

Venting it to a catch can although optimal would just mean added components and cost for the manufacturer to counteract an issue that should not occur.

Mr_Pieper

Besides, the routing of the lines was changed for the 2006 models. You should get a catch can for your 2004 or 2005, though.