BLKROKT

Is anyone monitoring this? I'm starting to get a little bit worried about oil starvation, given the forces at play and that we don't have the dry sump of the M159. AMG had to do that for a reason other than getting the CG down, right? Or maybe that's just it.

Has anyone hooked up a real oil pressure gauge, or is there a way I can tap into the existing sensor (surely there is one?) and track it with an app or other datalogger?

GeorgeSmooth talked about how well our engines are oiled in a post here once (https://mbworld.org/forums/c63-amg-w...ml#post5297077), and said basically that you would have to turn the engine upside down to starve it of oil. I'm still wondering if something like an accusump might be a good idea just as a preventative measure? Maybe I'm thinking too much about this, but I'll need data to determine that.

An accusump seems like the logical solution. It's cheap and effective. It's not a dry sump, but massively less expensive and complex. Canton Racing Products seem to make the most popular ones, and at $275 sounds like cheap insurance to me.
https://www.cantonracingproducts.com...ion&key=24-006




Here's some of the tech behind it. It's pretty simple - when it detects oil pressure dropping, it sends more oil to the engine from the 3qt accumulator, then refills when the pressure goes back up. I'm starting to like this idea.
http://www.accusump.com/accusump_tech.html#whatis


First step is to monitor oil pressure. If anyone has thoughts on this would be appreciated.

BLKROKT

Forget it. The more I read about the M156 oiling system, the more I'm realizing that it's total overkill. Still might like to monitor pressure though...

For future reference, here's a good post on the topic of M156 oiling. https://mbworld.org/forums/c63-amg-w...ml#post4087557

And some more detail from MBCA (this is a great series of technical articles on the M156 if you haven't seen them). The M156 is ridiculously overengineered.
https://www.mbca.org/star-article/ma...-amg-63-engine
https://www.mbca.org/star-article/ma...ne-refinements

julours

Thanks for the mbca links, very interesting literature.

BLKROKT

If you liked that, check out the videos on this page about how the M156 is built. Love this stuff. Yeah I'm a nerd.

http://australiancar.reviews/mercedesbenz_M156_M159.php

Vladds

there are some hints of what Mercedes themselves think about oiling of the C63.
Even although there is an oil temperature sensor and coolant temperature can be pulled and read in numbers and contents of tank can be pulled in gallons and temperature of transmission can be read, there is no rig whatsoever that is dorment, that can be accessed, to read the oil pressure.
This while all older Mercedes had a dashboard display of oil pressure.

So they don't seem worried.


The factory recommended method of shop checking the pressure involves replacing the oil filter plastic cap with one that has a pre-drilled and tapped opening for a sensor, and then read this pressure.
I thought about getting one, thinking that maybe it's not plastic, like the current one, but I can't decide where I would put the gauge.
Also, clearly the pressure reading differs, depending where you read it and Mercedes feels that the accurate readings are there, at the filter.


As far as at the track, oil temperature affects oil pressure greatly.
Mercedes took great care of cooling the oil.


As far as accusump, to me the best use of it, is not for the track, but for pre-lubrication.
A great percentage of the engine wear (I think I remember 3-5%) occurs in the one or two seconds at start up before the oil pressure is established, during cranking.
SO if you pre-lubricate, you increase the life of your engine 3-5%.
So if you hook up the accusump to discharge 5 PSI of oil, THEN crank, while the oil pressure ALREADY is 5 PSI, that would be good...

Jasonoff

Here's is thread over on germänboost. Make sure you fix the ä below...

http://www.germänboost.com/showthrea...198#post304198

BLKROKT

Yeah it's the same one from here (link above), but the pictures here disappeared a long time ago.

There's also an auxiliary pump that moves oil from the front of the pan back to the sump at the rear (pan is split-level due to the crossmember). Cool engineering.

Diabolis

Just saw this thread and was going to link to the one at https://mbworld.org/forums/c63-amg-w...ystem-c63.html but I gather you've already seen it. In short, oil starvation is not an issue. The oil foaming from being mechanically beaten and aerated is of greater concern, which is why the MB shop foreman / part-time race engine builder that works on my Merc told me to only fill up halfway between the low and high marks on the dipstick before track events (and top up between sessions if needed, but again do not go above the halfway point), and change the oil often as the foaming and high oil temperatures will significantly accelerate oil oxidation. Most decent synthetics contain a good amount of anti-foaming additives so if the oil is fresh and you keep the level at the halfway mark, oil starvation on the M156 should not be an issue.

I have an Accusump on the track rat (those engines chronically suffer from #2 rod bearing failures, and I am not sure if it actually helps with that particular issue). If you decide to install one (on any car), do *NOT* mount it in the cabin. I've heard of several of them letting go in a rather spectacular fashion, and sitting next to a reservoir of hot oil pressurized to 5 bar does make me somewhat uncomfortable...

BadCompany

Interesting read. Threads like these are the valuable ones.

As a side note, I run an Accusump in my Lotus. I agree that one of the reasons I like it is the pre-lubrication - especially given the fact that I have a big turbo to lubricate too.