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  1. #1
    Eurodavid
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    anyone ever heard of "piston scrubbing bubbles'?

    ok, I know this sounds crazy, and it probably is, but this engine builder I was listening to the other today I swore said (mind you, we're in foreign language territory, not my strong suit) along the lines that on high performance engines, it is beneficial to once every two years or once a year to take the plugs out, inspect them to look for the beautiful light brown/tan color signaling everything is good, and then he said the next thing: before replacing the plug, be sure to inject the piston cylinder with the carbon breakdown foam, and fill the piston cylinder until it comes back out the plug hole, then screw the plug back in. Leave sit for 48 hours, and then come run your car normally, and everything (mainly carbon buildup) that was on top of your high-mileage pistons will have been converted to some other liquid substance that is easily put out the exhaust. Did I hear this right? Is there some stuff actually like that? In the old days, we used to shoot some water into a vacuum line, and the resulting explosion would blow some of the carbon off the piston, but I never heard of this foam-like stuff.

    Anyone??

    Eurodavid

    P.S. He also said, and this I understood but was not sure I agree with, that no mater how high you run into rpms, all pistons and valves will develop carbon buildup. I thought you could literally blow the carbon right off stuff if you ran you car for an hour, constantly doing hard accelerations where the rpms never came below 4 and frequently hit up near 6k. No? Yes??


  2. #2
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    Yes | No

    I suspect you'd be quite surprised at how clean >>

    the combustion chambers are. I've seen two high-mileage German engines apart (4.5 liter MB, 175k; and 2.8 liter BMW M30, 160k), and the build-up was very thin, both on the piston top, and the combustion chambers.

    I remember The Olden Days, when the lead was caked all over the chamber, and could cause preignition.

    BTW, the hone marks were still visible in the bores. Admittedly, these were both iron block engines.

    Your friend is super meticulous!
    Ed in San Jose. BMW CCA member since 1987 (Nr. 62319). Golden Gate Chapter. '97 540i 6 speed. Build Date 3/97. Aspensilber over Aubergine leather.

  3. #3
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    Yes | No

    Look up Amsoil Power Foam - sounds similar


  4. #4
    Eurodavid
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    Re: Look up Amsoil Power Foam - sounds similar

    Craig,

    Ever give that stuff a go? Or been tempted to? Sounds like we could just squirt the whole thing into our butterfly throttle body (to avoid any MAF contamination) and let it do it's thing, that is, if there is any "thing" to it??

    Eurodavid

  5. #5
    Eurodavid
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    Re: I suspect you'd be quite surprised at how clean >>

    Edjack,

    Yes, the guy is a little on the outer reaches of being [Oops!]. He sees dirt anywhere on an engine, it bothers him. Lol, hates it when I show up and has to prepare himself when we look under my I6's hood ;-)

    Eurodavid

  6. #6
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    Scrubbing bubbles? Sounds like snake oil.....

    If you can get something to liquify 10 yr old carbon let me know.

    2000 540i Sport in Houston, TX

  7. #7
    Craig in Canada
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    Re: Look up Amsoil Power Foam - sounds similar

    I've used it on outdoor power equipment, never on a road car. I had heard from multiple sources that it's extremely effective, but the bimmer has never really had the need.

    Now, if I had one of the new DI engines I would probably be using it. With the DI systems they still have all the crap coming through the PCV/CCV back into the intake system (even more since they're often turbocharged and running the required North America "rich" settings) but they lack the fuel spray on the intake valves to keep things clean. On another forum I've seen folks that pull the IM every oil change and take pictures of the nasty goo built up. As much as it might pain me to do something like this to a brand new 335i or similar, that application screams for foam.

    I agree - the application instructions seem very "carb" oriented and I would not actually apply it via the air filter. If I were to use it on my E39 I6 I would probably pull the TB off of the IM with the engine off but warm and foam directly into the IM making sure to get all six runners if possible. Then button up, start up, and let'er fly. It makes smoke, it smells, and there's a lingering exhaust smell for 15m or so on the OPE I used it on. Lots of people seem to suck Seafoam in via their brake booster vacuum lines to clean kind of like this and PowerFoam seems to smoke a whole lot less than that. The Powerfoam also has the advantage of, well, foaming and being in contact with all IM and valve surfaces while it's acting instead of being a random squirt of liquid entering in one spot of the IM, passing quickly by and not full distributing to all cylinders.


  8. #8
    Craig in Canada
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    Plain water works too...(M)

    google "water decarbonization"

  9. #9
    Craig in Canada
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    ..but only in the CCs you can get it to, not IM


  10. #10
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    Yes | No

    Water turns to steam to loosen the carbon (m)

    This stuff seems like it would do a better job, here is a link with more info.
    http://www.fbodyonline.com/forum/f65...er-foam-67884/

    http://www.amsoil.com/storefront/apf.aspx

    I'm thinking about using my water/methanol injection setup to do the same thing, should work. I just need to turn the pressure down so it won't spray to much in too fast.

  11. #11
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    Yes | No

    Just bought 2 cans, I'll let you know how it works






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  12. #12
    beast to possibly get harmed! Eurodavid
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    Jim, test it on the Volvo first, don't want to the


  13. #13
    Eurodavid
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    Re: Look up Amsoil Power Foam - sounds similar

    Craig,

    Never thought of removing the throttle body completely off and injecting into the IM. That sounds like a heck of lot better plan. Depending on Jim sees, I may give this stuff a whirl just for the heck of it. I honestly don't think the car needs at all, but you know how it is: it has been months since I have gotten to do ANYTHING to my car, and I want to do something, any little thing, before winter sets in and locks me down.

    I really think this stuff would do wonders for my Honda lawn mower; I swear Honda runs that mixture way too rich......

    Eurodavid

  14. #14
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    Re: Look up Amsoil Power Foam - sounds similar

    We have the opposite problem with yard equipment here where the California government seems to have a say in how the entire continent gets treated. All OPE is coming with non-adjustable carbs which run really lean for "California compliance".

    So, needless to say, lots of things don't run properly unless you spend another $100 on a fully adjustable replacement carb (if it is available at all) to strap on to your string trimmer, lawnmower, snowblower, chainsaw, whatever. If you're really lucky you can find one being sold that still has adjustments but it seems rare.

    There's lots of great things about California but Governor Arnold needs to stay out of my garage or send some of his 75F and sunny all year round stuff my way as compensation.

  15. #15
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    How does this stuff blow out of thru the cats?,,,

    I've always wondered how it is that it finds its way out of suck labyrinth and doesnt find a new home in the exhaust?

    2000 540i Sport in Houston, TX

  16. #16
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    Test it on the go-cart, dont want the Volvo to get



    2000 540i Sport in Houston, TX

  17. #17
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    It softens and desolves the carbon....

    which is then burned of from the combustion heat; also, the cats run incredibly hot and will burn all "leftovers".Fritracer
    Cincinnati, OH
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  18. #18
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    Yes | No

    I've heard of scrubbing bubbles, but ahh, ummm



    If that guy wants you to use them, he can't think very much about your car.
    Vin
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  19. #19
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    Yes | No

    Will probably test it on my lawn tractor first, (m

    then of the Volvo. If it works as advertized I'll use it on the 540.

  20. #20
    our cars.....;-0 Eurodavid
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    but we would IF we had porcelain somewhere on


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