S85 Vanos Solenoids prices going crazy - Page 6 - BMW M5 Forum and M6 Forums
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post #51 of 367 Old 8th July 2016, 11:44 PM
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Originally Posted by gmak View Post
Your good humour in the face of this situation suggests that you have already replaced yours, or have 4 in hand.



I on the other hand do not like the risk of not having these critical parts on hand. I'll be ordering an SMG hydraulic pump motor as well - in case BMW decides to put the screws to those as well.


I was thinking to buy them when they were 300/piece but I have a 3rd party warranty so I decided not to. Not that they will cover them tho. Lol


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post #52 of 367 Old 9th July 2016, 12:09 AM
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Could that reason be that the S65 uses a different solenoid? Part number is 11367843117. They cost < $300 each. Of course, these wouldn't fit in our car given the difference in the nozzle.

Why DIDN'T BMW use the same Solenoid, given that the S65 is supposed to be an S85 with 2 cylinders chopped off? :dunno
Excellent. Some people putting thought into it. Let's make this an exercise for fun.

So, what's different about the VANOS system on S65? Here's a hint, see if you can find a part number for the VANOS pump.
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post #53 of 367 Old 9th July 2016, 12:27 AM
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post #54 of 367 Old 9th July 2016, 12:30 AM
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post #55 of 367 Old 9th July 2016, 12:40 AM
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Correct, low pressure system. The S85 is the only engine ever built by BMW to "require" a high pressure system. So, carry the thought forward. Comparing a high pressure system to a low pressure system, which one requires control valving with tighter clearances? Remember, the moving portion of the solenoid valves is on the inside of the cartridge you see. The o-rings on these are "static" seals meaning the form a pressure boundary for non-moving parts. The dynamic seals (3 of them) on the inner spool do not use software (o-rings) as the seal, but extremely tight tolerance metal on metal.
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post #56 of 367 Old 9th July 2016, 12:48 AM
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I'm lost but I get that there's no way we cant use S65 solenoids because they are not dynamic seals as the S85 which allows more pressure.


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post #57 of 367 Old 9th July 2016, 12:49 AM
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Sorry. Been only 3 years in the states so my English isn't the best


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post #58 of 367 Old 9th July 2016, 12:55 AM
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No worries.

So a higher pressure system requires a valve with stronger barriers. When those barriers are metal to metal, it means the tolerances have to be tighter to prevent leakage.

Very tight tolerances for metal on metal movement is problematic (read also as dumb) in fluid system that is used to lubricate an engine. Wear particles from the engine become trapped in the solenoid bodies and score the boundary surfaces. This creates gouges and/or burrs and causes leakage past the pressure boundaries.
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post #59 of 367 Old 9th July 2016, 01:00 AM
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What would be the solution for this? Rework the design a bit? Or change the oil filter every 500 miles? Lol


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post #60 of 367 Old 9th July 2016, 01:22 AM
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Change the filter every 499 miles.

I don't think that there is a solution unless you could build the dynamic seals out of a strong yet flexible material that doesn't gouge. Some kind of space-shuttle stuff. Or has characteristics that can take a gouge and still seal - now we;re getting into sci-fi areas.

Or... couldn't they be made like the rings on pistons?

Last edited by gmak; 9th July 2016 at 01:24 AM.
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