Engine carbon cleaning with hydrogen. - Page 2




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  1. #21
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    Default Re: Engine carbon cleaning with hydrogen.

    Quote Originally Posted by cr1sp1 View Post
    This looks very interesting, just strange that there are no 4x4 or SUV photos in their gallery.

    What was the cost Pieter?
    Perhaps because most 'run of the mill' SUV's are diesel models, with only a few FSI petrol models, e.g. some Touareg models etc?

    Re the cost - will have to check as it was some years ago.
    Pieter
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  2. #22
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    Default Re: Engine carbon cleaning with hydrogen.

    I would take the car for a nice long run.
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  3. #23
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    Default Re: Engine carbon cleaning with hydrogen.

    Quote Originally Posted by PieterOos View Post
    Took two FSI engines in for walnut cleaning (Carbon Doc) - scary to see the deposits caused by this FSI technology

    Here is one of them:
    http://www.carbondoctor.co.za/displa...SI-57252KM.jpg

    (Other one was a Audi 2.0 TFSI)
    All engines have that builkd up in the intake but intake port injection cleans it out. FSi is direct injection so there is no cleaning happening.

    You can greatly slow the process by installing a catch can.

  4. #24
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    Default Re: Engine carbon cleaning with hydrogen.

    Am I correct in saying that (especially in direct injection engines), all the carbon deposit is mostly (if not all of it) caused by crank case ventilation feeding oil into the inlet manifold?

    The relatively low temperatures of the inlet air causes the build up, and prevents it to be "burned away".
    A hard drive won't do anything, because it won't increase the inlet tract temperatures (unless EGR is very good).

    Solution:
    • catch can
    • EGR (to raise inlet air temperatures)?
    "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity" - Martin Luther king Jr

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    (currently done more than 373 000 km)

  5. #25
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    Default Re: Engine carbon cleaning with hydrogen.

    Quote Originally Posted by 4eTouareg View Post
    Am I correct in saying that (especially in direct injection engines), all the carbon deposit is mostly (if not all of it) caused by crank case ventilation feeding oil into the inlet manifold?

    The relatively low temperatures of the inlet air causes the build up, and prevents it to be "burned away".
    A hard drive won't do anything, because it won't increase the inlet tract temperatures (unless EGR is very good).

    Solution:
    • catch can
    • EGR (to raise inlet air temperatures)?
    I think EGR is a culprit along with CCV

    CCV will feed relatively clean oil into the intake. So everything will be wetted but no build up.
    EGR feeds relatively dry soot into the intake, which would just blow through

    Combine the 2 and you get sticky sludge. Add heat and you bake it on.
    Rob
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  6. #26
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    Default Re: Engine carbon cleaning with hydrogen.

    2SO won't work, because there is no fuel going through the inlet manifold!
    "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity" - Martin Luther king Jr

    2006 VW Touareg V10 TDi
    (currently done more than 373 000 km)

  7. #27
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    Default Re: Engine carbon cleaning with hydrogen.

    Agreed. EGR makes it worse.

    If you delete EGR and you vent PCV to atmosphere you will never have build up in the intake - regardless of engine technology used.

  8. #28
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    Default Re: Engine carbon cleaning with hydrogen.

    Quote Originally Posted by PieterOos View Post
    Took two FSI engines in for walnut cleaning (Carbon Doc) - scary to see the deposits caused by this FSI technology

    Here is one of them:
    http://www.carbondoctor.co.za/displa...SI-57252KM.jpg

    (Other one was a Audi 2.0 TFSI)
    I went thorough the same exercise with my 1.8TFSi A4, before and after pics were quite impressive, but all and all I didn't notice a very big change, if I were to speculate the build-up happens pretty quickly and the engines are designed with that in mind. My car was cleaned on about 175k km and if you look at the before pics, it looks much the same as the intake on the Golf you posted (which is on 57k km as far as I can see).

    It did clear up an intermittent MIL light I was experiencing for "intake flap position censor reading in-plausible" and the car did feel ever so slightly more responsive for a short amount of time, hoever if you are not having problems I would leave it alone.
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