Beleive it or not OIL!! - Toyota Nation Forum : Toyota Car and Truck Forums

nukem678 · 12-22-2008, 11:16 PM

I just cleaned out my oil catch can (dont laugh) and i got about half a cup of oil out of it. It hasnt been cleaned in about 30,000 miles. So that little tin can from Egay really does work. It just kept all that oil from going into my engine. Not a bad investment for 20 bucks and 15 min of work. Just some FYI

Jimnist · 12-23-2008, 07:51 AM

Yeah, and that's on a NA car. Imagine how much you'd get on a forced induction engine XD

Maybe i should invest in one, i've got a fair bit of oil around that PCV nipple and hose.

Tremendous_Slouch · 12-25-2008, 03:34 PM

Forgive me ignorance but whats an oil catch can?

Jimnist · 12-25-2008, 10:32 PM

To understand what an oil catch can, you need to know a little bit about the PCV(Positive crankcase ventilation) system. Basically, it prevents emissions of the crankcase vapours to the atmosphere, by having the vapours drawn into the throttle body via hose from the rocker cover(aka valve/tappet cover).

If you didn't get that, it 'recycles' the vapours and gases in the crankcase by circulating it into the combustion process through the intake manifold or throttle body. There is a vacuum as it is connected to the intake, so, as well as getting all the vapours and gas, oil vapours get caught along the way. Because there are oil vapours in the crankcase gas, over time, the vapours accmulate and can become a substancial amount. It all ends up along your intake system, the throttle body, intake manifold, probably all the way down to the inlet valves. Which is why they made an oil catch can. It's connected right onto the hose between the PCV nipple on the valve cover and the intake manifold. The oil will no longer end up along your intake.

nukem678 · 12-27-2008, 07:26 PM

Amen!

Cannabis Camry · 01-04-2009, 06:59 PM

I don't understand why the crankcase pressure can't just be vented. I don't see the point in sending it back into the intake.

Jimnist · 01-04-2009, 08:38 PM

Because if it was vented straight into the atmosphere, there will be more, and possisbly harmful, emissions being released. Which is why they recirculate it back into the intake, and thus the combustion process. It's just part of emission regulation, also why there's the EGR (exhaust gas recirculation) system in place.

But, that's not to say people don't vent it. You can buy little breathers for the PCV. I kind of looks like a pod filter, but much much smaller and they just clamp it on.