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How much oil is up in the engine internals when the engine is running? The answer is quite a bit of it, so much in fact that Porsche used scavenging pumps in the cylinder heads to help get the oil back to the sump faster to prevent the oil pump from cavetating and creating oil foam, which neither cools or lubricates properly. On the early cars with dipsticks, people often ask if it is correct to not have oil showing on the dipsticks with the engine running, and many have commented that the digital oil level indicators show the same thing right after the engine is turned off. There is a lot of oil entrained in these engines when they are running, a lot of it because of the “flat” configuration of the cases .
Exactly. There`s a lot of oil in the cylinder heads that is constantly being pumped back to the sump. As a result, when the engine starts, the scavanging kicks in too, so the oil level should be even higher in the sump than when it`s shut off... I still don`t get it. About the dipstick: how could the level be measured when the engine is on while oil is being splashed all over inside the engine case including the dipstick?
Oil mist inside the engine: Raby and LN examined this phenomenon during the development of the first generation of retrofits because they were concerned about how to properly lubricate the hybrid bearings.
Interesting, I`d like to read more about this, is this published somewhere? How did they do it? They inserted a boroscope into the case?
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