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      07-20-2019, 08:48 PM   #1
DrivingPassion
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Do you clean your valves?


  1. Walnut blasting: I recall my dealer used to try to sell me this but when I asked about it recently, they said they do not have it anymore.
  2. Heavier oil: looks like heavier oil evaporate less
  3. Does F80 have a PCV feedback loop back into the valves?

What do you guys do?
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      07-21-2019, 01:36 AM   #2
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Quote:
Originally Posted by DrivingPassion View Post

  1. Walnut blasting: I recall my dealer used to try to sell me this but when I asked about it recently, they said they do not have it anymore.
  2. Heavier oil: looks like heavier oil evaporate less
  3. Does F80 have a PCV feedback loop back into the valves?

What do you guys do?
Honestly, I am unsure if you are joking lol
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      07-21-2019, 08:40 PM   #3
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New engine don't do carbon build up no more.
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      07-21-2019, 09:40 PM   #4
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https://f80.bimmerpost.com/forums/sh....php?t=1010050

non issue these days for these engines. check back at 100k miles imo.
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      07-21-2019, 09:52 PM   #5
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Quote:
Originally Posted by blockdoc View Post
Honestly, I am unsure if you are joking lol
More honestly, unless you know something we don't, is anyone laughing after your S55 intake valves are all choked up in 20K miles.
But, if you do know something, then share it instead of producing that hacking cough of sarcasm, like a choked intake valve does.
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      07-21-2019, 09:54 PM   #6
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Quote:
Originally Posted by bedboy View Post
New engine don't do carbon build up no more.
Why don't they? What's BMW doing differently from other engine designer? Please share the reasons.
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      07-21-2019, 10:04 PM   #7
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Quote:
Originally Posted by danniexi View Post
https://f80.bimmerpost.com/forums/sh....php?t=1010050

non issue these days for these engines. check back at 100k miles imo.
Yes, the S55 engines out there are still pretty new. I agree.
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      07-22-2019, 12:02 AM   #8
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That's what she said
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      07-22-2019, 08:02 PM   #9
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Quote:
Originally Posted by DrivingPassion View Post
Quote:
Originally Posted by blockdoc View Post
Honestly, I am unsure if you are joking lol
More honestly, unless you know something we don't, is anyone laughing after your S55 intake valves are all choked up in 20K miles.
But, if you do know something, then share it instead of producing that hacking cough of sarcasm, like a choked intake valve does.
What a douche bag. Chill out brother. Based on your posts in multiple threads about the same issue. Just go ahead and clean them if you are so paranoid about it.
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      07-23-2019, 12:01 AM   #10
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Not required. PCV system on the S55 has been greatly improved over past generations.

You may need to do a walnut blast if your air to water intercooler leaks into the intake tract though lol... if itís not one thing, itís another on these cars.
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      07-23-2019, 07:28 AM   #11
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Just give you car an Italian tune up once in a while.
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      07-23-2019, 01:56 PM   #12
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I have a nut allergy - is there a walnut-free method to clean the valves?
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      07-23-2019, 02:00 PM   #13
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Quote:
Originally Posted by gatorfast View Post
I have a nut allergy - is there a walnut-free method to clean the valves?
If only my girlfriend's ovaries had that allergy.
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      07-23-2019, 03:43 PM   #14
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Interesting, I would imagine having to take off the head to clean it. If the intake valves look that bad, then the top of the pistons will have carbon deposits as well.

I personally won't do this until I run into performance issues like detonation/pinging.

The newtis workshop manual has references to walnut blasting, but only as a hint.


https://www.newtis.info/tisv2/a/en/f...ine/1VncxtfASg

This place says 80k for the service.

https://www.bandbautohaus.com/blog/2...alnut-blasting
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      07-26-2019, 10:58 PM   #15
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I'll stick with the Italian tune-up and hope for the best.
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      07-26-2019, 11:58 PM   #16
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Quote:
Originally Posted by NYG View Post
If only my girlfriend's ovaries had that allergy.
Well, would she cares since there are no visible nuts.
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      07-27-2019, 12:02 AM   #17
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Quote:
Originally Posted by Paisano View Post
I'll stick with the Italian tune-up and hope for the best.
That sounds logical but are there any good data or research done to say this method will solve the problem: it certainly sounds easier and more fun, too.
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      07-27-2019, 12:03 AM   #18
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Quote:
Originally Posted by hellokitty View Post
Not required. PCV system on the S55 has been greatly improved over past generations.
[...]
Do you have any documentation on this?
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      07-27-2019, 10:00 AM   #19
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Eat where you poop

It's interesting why partially combusted gas/oil/air mixture is vented thru the PCV and fed back into the intake valve. Why not fed into the exhaust? All in the name of saving gas and emission ctrl?

This is the same design issue as the M16 assault rifle direct impingement design where they fondly call it: eating where you poop.
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      07-27-2019, 10:10 AM   #20
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Quote:
Originally Posted by DrivingPassion View Post
It's interesting why partially combusted gas/oil/air mixture is vented thru the PCV and fed back into the intake valve. Why not fed into the exhaust? All in the name of saving gas and emission ctrl?

This is the same design issue as the M16 assault rifle direct impingement design where they fondly call it: eating where you poop.
Not fed thru the exhaust b/c itís illegal to dump into the atmosphere. Take it as a grain of salt because itís also illegal to j-walk.

Walnut blasting is not really necessary as the s55 engines are not Volkswagen/Audi motors and even they did not really need catch cans unless the hp was increased 120%.
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      07-27-2019, 10:29 AM   #21
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Quote:
Originally Posted by clutchdj View Post
Not fed thru the exhaust b/c it’s illegal to dump into the atmosphere. Take it as a grain of salt because it’s also illegal to j-walk.
So, this is their mentality:
  1. pass emission stds
  2. sell as many new cars as possible
  3. hack care the longevity of their products
That's very short-sighted.

Quote:
Originally Posted by clutchdj View Post
Walnut blasting is not really necessary as the s55 engines are not Volkswagen/Audi motors and even they did not really need catch cans unless the hp was increased 120%.
Can you elaborate a little more, what you said is pretty vague.
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      07-27-2019, 11:39 AM   #22
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Quote:
Originally Posted by DrivingPassion View Post
So, this is their mentality:
  1. pass emission stds
  2. sell as many new cars as possible
  3. hack care the longevity of their products
That's very short-sighted.


Can you elaborate a little more, what you said is pretty vague.
No, their mentality was actually that they have EPA standards to meet. If you're worried, get an Oil catch can and catch all the crap getting recirculated into the charge pipe / intercooler / intakes. Then check in 50k if you need walnut blasting, which I heavily doubt especially with an OCC. There have been people that opened up their S55 and valves are essentially clean at high mileage, however, blow by still occurs. The S55 just doesn't seem that prone to buildup compared to N54 / VAG DI cars, but as with all turbo / DI cars, blow-by is never a good thing, whether minuscule or not.
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