E46 M3 S54 Vanos pressure tests

[Santino]

I think you are confused, you are measuring OIL pressure at the engine, the VANOS shall have 100bar at all times, idle, load, etc. Where did you attach the gauge, I assume you did it at the oil filter housing.

That said, you have pretty healthy pressure, the pressure at idle should be 1bar, you have a bit more but I don't see that as a bad thing at all.

To measure VANOS pressure, you plug the indicator at the VANOS oil line that goes to the accumulator, and you need a different gauge, the one you have will blow out as VANOS pressure is 1400+ psi.

BTW, I don't think VANOS would affect engine oil pressure at all as it has a feed valve that I think is max 1 bar (cannot find the source where I read this, but makes sense since the VANOS makes full pressure at idle, so it shall be at least 1bar at the infeed valve at all times)

Yes i have done the vanos oil pressure test, its in on the previous page, but i was geting pressure dips when reving and Sapote recomended to make a oil pressure test to check if the presure dipps also apear in the oil system ore ist it only the fault of the vanos accumulator
regarding the oil pressure i found info that it should peak at 4 bar so it apears that mine is showing 1bar higher pressure on idle ore on revs

[maupineda]

I think you are confused, you are measuring OIL pressure at the engine, the VANOS shall have 100bar at all times, idle, load, etc. Where did you attach the gauge, I assume you did it at the oil filter housing.

That said, you have pretty healthy pressure, the pressure at idle should be 1bar, you have a bit more but I don't see that as a bad thing at all.

To measure VANOS pressure, you plug the indicator at the VANOS oil line that goes to the accumulator, and you need a different gauge, the one you have will blow out as VANOS pressure is 1400+ psi.

BTW, I don't think VANOS would affect engine oil pressure at all as it has a feed valve that I think is max 1 bar (cannot find the source where I read this, but makes sense since the VANOS makes full pressure at idle, so it shall be at least 1bar at the infeed valve at all times)

[Santino]

As rpm increasing, pump output is increased too, and so even with some oil being used by the vanos pistons movement, I think with a normal working ACC the system pressure should not drop that much as shown on post #32. Look at post #1 video.

Finaly my vanos electrovalves came back from cold solder fix, so i have tested the oil pressure as You mentioned
So on startup it mesured 4bar, and slowly when getting hotter it droped to 2 bar on idle, but as soon as i touch the gas it bumps to 5 bar, and blips ups when reving
i should mention i have changed the oil pump piston using the burkhart engenerig unit, as mine was worn at 100k miles when ive chenged to rod bearings.
also im waiting till the end of the month for the ordered vanos pressure acumulator, as they are out in all EU

[jet_dogg]

Even IG and e-mail life. I could never get him to help out. He would randomly reply, I’d be ready to purchase once confirming what he thought was the issue.

Good luck.


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I've not purchased from several people who refuse to provide adequate service. It's not hard replying to emails and the sporadic responses are even worse with the avoidance of question answering topping my list.

Very few people actually know how to run a business and provide some semblance of customer service which is a lost art especially these days.

[stash1]

Even IG and e-mail life. I could never get him to help out. He would randomly reply, I’d be ready to purchase once confirming what he thought was the issue.

Good luck.


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Dunno, I've heard from ppl that he can be a little difficult to get a hold of sometimes...but I know that he travels a fair amount for work and that it takes him to some remote locations.

[LatinSkllz]

He’s around, but pretty sure he gave up on forum life.

Even IG and e-mail life. I could never get him to help out. He would randomly reply, I’d be ready to purchase once confirming what he thought was the issue.

Good luck.


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[stash1]

Is Mike from Natturally Agitated performance still around?

He’s around, but pretty sure he gave up on forum life.

[Mpwr922]

Is Mike from Natturally Agitated performance still around?

[sapote]

a slight drop is expected as oil pressure is used to displace the spline gears in and out, it would be nice to collect data from various cars understanding the different states of them. i.e. old accumulator vs new logging the pressure drop after engine shut off.

As rpm increasing, pump output is increased too, and so even with some oil being used by the vanos pistons movement, I think with a normal working ACC the system pressure should not drop that much as shown on post #32. Look at post #1 video.

[maupineda]

In the meantime, just to be sure a bad ACC is to blame, you can hook up an external oil pressure gauge to the engine oil sensor and check engine oil if it drops when rev up as shown in previous video, for whatever the reasons. It should not drop.

a slight drop is expected as oil pressure is used to displace the spline gears in and out, it would be nice to collect data from various cars understanding the different states of them. i.e. old accumulator vs new logging the pressure drop after engine shut off.

[sapote]

will get one on order, but will take some time as im taking out some parts to get polished. but any way will come back with a video of a fresh unit instaled so we can compare it

In the meantime, just to be sure a bad ACC is to blame, you can hook up an external oil pressure gauge to the engine oil sensor and check engine oil if it drops when rev up as shown in previous video, for whatever the reasons. It should not drop.

[Santino]

SMG pump has higher output rate than VANOS pump, and so with the ACC working the pump shut off after filled up the ACC. VANOS pump has much smaller output rate and it needs the ACC to supply the pressure during timing change as pump output is not enough for the pistons movement.

will get one on order, but will take some time as im taking out some parts to get polished. but any way will come back with a video of a fresh unit instaled so we can compare it

[sapote]

but in my understanding the vanos pump is running constantly, unlike the smg pump witch also used the pressure acumulator

SMG pump has higher output rate than VANOS pump, and so with the ACC working the pump shut off after filled up the ACC. VANOS pump has much smaller output rate and it needs the ACC to supply the pressure during timing change as pump output is not enough for the pistons movement.

[Santino]

what do you mean "upped the pressure"? You adjusted the pressure regulator -- to how high?
It dropped rapidly because there was no reverse from dead ACC.

Also, during driving the pump turn on vs turn off duty cycle is too many, leading to worn pump/motor quicker.

yes i've used the pressure regulator on the side of the vanos unit, but in my understanding the vanos pump is running constantly, unlike the smg pump witch also used the pressure acumulator

about the price in europe price is better than us sites,

https://www.bmwstore.pl/pl/katalog/produkt/7836050-zbiornik-cisnieniowy

540zl is something about 135usd, but ive got better discount and also possibility to buy without 23%tax , so its like 99 usd

[maupineda]

That what i was thinking, also i thougt the leak down is to rapid, for my luck Acumulator tank is normaly priced something about 110-120 dolars so i will order new OE unit and will check how it changes
here is the vid i took before upped the presure one the vanos unit

Man, yours is holding pressure for pretty long, mine goes to zero in like 3 seconds