High oil pressure

[Noz]

Hi folks,

I'm curious if having too high oil pressure, could cause oil (when warm) to be pushed into the combustion chamber past the rings?

I need to check the logs, but just wondering peoples thoughts before I get the chance.

Edited June 21, 2022 by Noz (see edit history)

[Style]

Absolutely, if the pressure is too high it will look to escape somehow.

Are you running higher than ideal oil pressure?

 

[evinX]

4 hours ago, Noz said:

Hi folks,

I'm curious if having too high oil pressure, could cause oil (when warm) to be pushed into the combustion chamber past the rings?

I need to check the logs, but just wondering peoples thoughts before I get the chance.

Depends on how powerful your engine is. How well its vented. And how strong the areas of escape are.

Blow by will always happen in any kind of engine to a degree. But a modded jz running high hp...id expect more than usual especially with wear and tear

[Swampy442]

There shouldn't be anything in terms of oil pressure in the return to the sump, so no, high oil pressure wont cause oil past the rings. High crankcase pressure would cause issues, and that why cars have a vacuum powered PCV (positive crankcase ventilation) system. The engine likes a bit of vacuum in the crank case.

 There was a great thread years back about crank case scavenging, including routing a breather into the exhaust downpipe

[Mike2JZ]

We run some fairly high oil pressure builds and don’t have any issue with oil burning. It’s more likely a ring sealing issue or damage to cylinder bore surface