Upper cylinder cleaners
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Thread: Upper cylinder cleaners

  1. #1
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    Default Upper cylinder cleaners

    When I got my first Xantia in 2006, it seemed to be popular to de-coke piston tops etc. by pouring a teaspoon or two of brake fluid through the spark plug hole, and leaving it overnight to work it's magic before starting the car and admiring the clouds of smoke. This of course was supposed to loosen up carbon deposits and allow them to be swept out with the exhaust. I confess I did try it at the time - can't say that I was aware of any massive performance improvement, but it didn't appear to do any harm (apart from smoke affected washing).

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    Is this still an approved technique? Or has it been relegated, along with tin canisters etc., to the dustbin of history? Are there downsides (could it increase bore wear, gum up exhaust valves, block the catalytic converter etc)?

    I am also intending to feed the engine a can of LiquiMoly Petrol Engine Intake Decarb. I am hoping this will clean up the air intake tract, but does it make the brake fluid redundant?

    The engine I am thinking of trying it on is a 19-year old ES9J4, that has traveled c. 170,000km.

    Cheers

    Alec

  2. #2
    Too many posts! JohnW's Avatar
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    I thought that sort of thing went out in the 1950s. I'll be interested to see what people say though.
    JohnW

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  3. #3
    1000+ Posts driven's Avatar
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    Probably end up losing all your compression if you have any left that is

  4. #4
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    Compression is good - 180 +- 5 psi on all 6.

    Please excuse my cracked 'glass':


    Cheers

    Alec

    Compression gauge.jpg

  5. #5
    1000+ Posts Kim Luck's Avatar
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    Quote Originally Posted by Armidillo View Post
    When I got my first Xantia in 2006, it seemed to be popular to de-coke piston tops etc. by pouring a teaspoon or two of brake fluid through the spark plug hole, and leaving it overnight to work it's magic before starting the car and admiring the clouds of smoke. This of course was supposed to loosen up carbon deposits and allow them to be swept out with the exhaust. I confess I did try it at the time - can't say that I was aware of any massive performance improvement, but it didn't appear to do any harm (apart from smoke affected washing).

    Is this still an approved technique? Or has it been relegated, along with tin canisters etc., to the dustbin of history? Are there downsides (could it increase bore wear, gum up exhaust valves, block the catalytic converter etc)?

    I am also intending to feed the engine a can of LiquiMoly Petrol Engine Intake Decarb. I am hoping this will clean up the air intake tract, but does it make the brake fluid redundant?

    The engine I am thinking of trying it on is a 19-year old ES9J4, that has traveled c. 170,000km.

    Cheers

    Alec
    You obviously haven't been using enough "REDEX" Upper Cylinder Lubricant, so I'd recommend a treatment of good old "Bristol Self De-Coke"!!
    Don't it always seem to go that you don't know what you've got 'til it's gone............

  6. #6
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    Well I googled the above treatment - if this is what you meant Kim, then you're a very naughty boy!

    https://mixmag.net/read/bristol-cocaine-europe-news

  7. #7
    1000+ Posts PeterT's Avatar
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    Subaru.

    '92 205 Mi16
    '90 Mi16x4

  8. #8
    1000+ Posts schlitzaugen's Avatar
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    Water injection will clean the combustion chamber and piston nicely.
    Armidillo likes this.
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

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    1000+ Posts alan moore's Avatar
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    As Peter has alluded to, Subaru have a product that can be sprayed down a vacuum line whilst the car is running. I used this cleaner on a XU10J2 many years ago that had a massive carbon build up behind the inlet valves. I removed the injectors and cut down the sides of a toothbrush to fit in the injector hole. I sprayed the foam down the hole of a closed valve and scrubbed the back of the valve with the toothbrush. The original build up was about 6mm thick, and after 20 mins work all were clean.

    I ran the motor producing a large cloud of smoke for 5 mins, and all was well. The car did pick up some power after cleaning.
    '56 Renault 750 (16TS Power)
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  10. #10
    1000+ Posts alan moore's Avatar
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    Double post. Posting on a phone sometimes doesnít work so well.
    Last edited by alan moore; 21st April 2019 at 12:37 AM.
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
    '08 Renault Megane sedan

  11. #11
    1000+ Posts Kim Luck's Avatar
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    Quote Originally Posted by Armidillo View Post
    Well I googled the above treatment - if this is what you meant Kim, then you're a very naughty boy!

    https://mixmag.net/read/bristol-cocaine-europe-news
    I was thinking more of a 50's treatment in a can, maybe similar to this: Engine Carbon Clean - Home -The Ultimate 30 Minute Engine Detox
    Don't it always seem to go that you don't know what you've got 'til it's gone............

  12. #12
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    Hmmm - no harmful chemicals, allows easier breathing etc. - sounds like I should try it for my asthma!

    Cheers

    Alec

  13. #13
    1000+ Posts PeterT's Avatar
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    Here is the result of putting a can of Subaru cleaner through an XU10J4 which had done approx. 200 000Km. It was a lot worse than that before I had time to get the phone out.
    Attached Images Attached Images

    '92 205 Mi16
    '90 Mi16x4

  14. #14
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    Very impressive - looks similar to the results of the brake fluid treatment! At first I thought I could see soot particles in the smoke, but they turned out to be spots on my screen!

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