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Thread: Sea Foam

  1. #1
    Join Date
    May 2016
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    1982 e21

    Sea Foam

    Was wondering if any body can give me some advice as how to go about using sea foam to clean injectors and all interior of motor. have heard this is the thing to use just not sure where to put it in motor or vacuum hose, or gas tank.
    thanks in advance..

  2. #2
    Join Date
    Apr 2014
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    DFW TX USA
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    1983 320I, 1986 325E
    Don't do inside the engine. I did it in a abused honda motorcycle I used to own and regretted it immediately afterwords. The dirt was "holding" the engine together. After that it clattered and made much more noise.

    I don't see any issues running it through the fuel system though.

  3. #3
    Join Date
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    sold 78 BMW 320i
    For now, just use it in the fuel tank. Change the fuel filter soon afterwards...
    Tbd

  4. #4
    Join Date
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    Cool

    Quote Originally Posted by Resurrectede21 View Post
    Was wondering if any body can give me some advice as how to go about using sea foam to clean injectors and all interior of motor. have heard this is the thing to use just not sure where to put it in motor or vacuum hose, or gas tank.
    thanks in advance..
    Seafoam comes is spray or liquid in a can either can be used to fog the motor. I have done this several times and its a good idea. There is also Gumout which is better as it has "PEA" which is a cleaning agent. The point of fogging the motor is to reduce carbon deposits on the cylinder tops or pistons, both have upper cylinder lubricant. I have done this several times and it does not harm anything in fact it helps the motor and reduces carbon deposits.

    To decarbonize the pistons or reduce the amount on the piston tops , remove the rubber plug underneath the the throttlebody and put a rubber hose into the can of seafoam and put the other end into the throttlebody, block the opening into the throttlebody around the rubber hose going in to block air, then start the car and with your hand grab the accelerator cable arm and pull it to rev the motor up too 2000 rpms or so , so that the motor wont stall,then swirl the can to feel the liquid being drawn in by vacuum into the throttle body, a lot of smoke will start to come out the tail pipe, I mean tremendous amount, keep the car running until the can is empty or 1/2 way then release the accelerator cable arm and remove the rag and hose from the opening, the car will die, then plug up hole, wait about 5-10 minutes and restart the car and take it for a drive, do spirited driving---floor the gas pedal,lol and you'll see the smoke again, drive until no smoke a few minutes, you have started to decarbonize the piston tops which will improve the engine performance and reduce NOX and so forth. This will also cool the engine down a little.

    Spray can same thing. Putting in the gas tank will clean the fuel injectors and the gas lines. I have done this several times before smogging the car it helps, plus reduces carbon on the piston tops which robs performance if too heavy.

    Milton something else was wrong with your engine,this stuff or Gumout with PEA, better fogging agent cant screw with your motor or catalytic converter or o2 sensor or anything else. Dirt and contaminants cannot keep your motor in good shape.

    carbon deposits on the piston tops is normal for internal combustion motors, taking the head off and removing the carbon deposits is a temporary fix, within a month or two its back again, you want to keep it in check and not let it buildup way too much.

    In conclusion, put in gas tank to clean the fuel system including injectors and fog the motor to reduce carbon deposits on the piston tops and some on the valves and elsewhere and keep it going, this is not a one time fix and its all gone, put in a ounce or so on each fillling station visit fill up.

    ATF was used for along time, yet it burns too hot, this oil based stuff does not burn too hot.

    As to keeping the engine internals clean change your oil filter more often( or use wix oil filter and change every 6 months), oil sludge belongs in the oil filter not the oil pan or in the motor.

    Robert you know this, oh its your Irish coffee too much Irish and not enough coffee,,lol.

    Randy
    Last edited by 320iAman; 02-01-2017 at 11:58 AM.

  5. #5
    Join Date
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    There are three main ways to use Seafoam, in the oil, in the fuel tank, or through the intake via vacuum line. Using it in oil is not recommended on old engines because as already mentioned it can often cause more problems than it fixes due to the engine being held together by sludge. It can also lodge chunks of sludge in oil passages, blocking flow to the head. BUT, it's harmless to use in fuel tank, and safe to use in the intake when done properly. Just find any vac line coming off the intake, pull it, start the engine and stick the line into the seafoam, being careful not to let it stall the engine. You'll throw out an unbelievable amount of white smoke and water vapor so do it when the neighbors aren't outside. It's also a good idea to do an oil change afterward.

  6. #6
    Join Date
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    All the white smoke billowing out of the tailpipe is the seafoam burning off. I watched a Youtube video which I can't find anymore of a guy with a scope looking into the spark plug hole at the top of the pistons. There was moderate to a small amount of carbon deposits on the pistons.

    After using seafoam, I would say maybe 5% of the carbon was cleaned off the pistons. He tested other products, too, and none of them cleaned the top of the pistons more than that. He was disappointed with the results.

    In another of his videos there was some carbon build up on the valves. After seafoam, a small amount of carbon was removed from the valve stem.

    I watched another video where a lot of carbon was removed, so I suppose it depends. I'm not convinced that a moderate amount of carbon on the pistons or the tops of the valves makes any difference or is harmful, unless there's big chunks or something. This is just my opinion, I could be wrong.

    I would think if carbon deposits are causing a problem with engine performance, a top-end overhaul would be the best solution.

  7. #7
    Join Date
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    Quote Originally Posted by Starmountainkid View Post
    All the white smoke billowing out of the tailpipe is the seafoam burning off. I watched a Youtube video which I can't find anymore of a guy with a scope looking into the spark plug hole at the top of the pistons. There was moderate to a small amount of carbon deposits on the pistons.

    After using seafoam, I would say maybe 5% of the carbon was cleaned off the pistons. He tested other products, too, and none of them cleaned the top of the pistons more than that. He was disappointed with the results.
    I remember seeing something similar. Maybe this is the video? https://www.youtube.com/watch?v=u6UeJXkzDW8

    YouTube has a History option on the left, and you can search through it. I just searched for "Seafoam" and that came up.
    '81 E21 320i / '90 E30 325i / '̶9̶2̶ ̶E̶3̶4̶ ̶5̶2̶5̶i̶t (sold) / '15 Toyota XW30 / '̶̶8̶0̶ ̶E̶2̶1̶ ̶3̶2̶0̶i̶A̶ (sold)

  8. #8
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    my 2cents and take at your own risk

    Seafoam is great stuff and does work. If want to see it seriously clean carbon off pistons without taking the head off and 3m wheeling it yourself, then it needs to go in the motor and sit. It will dissolve even the nastiest large chunks. Pull the plugs and pour a few ounces down each hole. Can rotate the motor by hand a slight bit but can keep adding a few ounces over several days. Seafoam is quicker than marvel mystery oil but can accomplish the same carbon cleaning off the tops. Eventually the seafoam will pass the rings into the oil pan so it will be in the oil upon running. Don't use over recommended amount for inside engine use unless changing the oil. After a few days or so of this soaking action, put in a good set of plugs and fire up. It will smoke for over 15+ minutes and probably a drive or two. Eventually it does stop smoking, but the tops are carbon free.
    I've also had luck with marvel mystery oil doing the same but it takes much longer to eat the same carbon that seafoam does.

    Quickest though is still the oldest cleaner. Water. Want to instantly clean piston tops use good old water. Spray mist water into the intake with low revs. Only downside to this is if accidentally dump or spray way too much you could cause damage. Most misting though it will stumble but will be fine. Just don't pour it in cause water doesn't compress
    88 M3
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  9. #9
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    Quote Originally Posted by amarino View Post
    I remember seeing something similar. Maybe this is the video? https://www.youtube.com/watch?v=u6UeJXkzDW8

    YouTube has a History option on the left, and you can search through it. I just searched for "Seafoam" and that came up.
    Yes, that's the video.

  10. #10
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    LA Calif
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    I used it in the gas in my 320i. After several tank full of gas. I can see the fuel injection lines turn to a clear white color...yes it works

  11. #11
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    I wonder how Seafoam poured in the cylinders effects rings? My '79 320i burns a bit of oil. I'm wondering if it would help get rid of carbon on the rings making the engine burn more oil? The carbon may be holding the rings together!

  12. #12
    Join Date
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    The '85 323i engine in my '79 has about 45k on it but sat for ~15 years. I can't imagine anything good would happen if all of that old oil buildup and carbon were released into the oil and exhaust at once.


  13. #13
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    if u care about ur car never use seafoam, I was in Germany few months ago and spoke to an BMW specialist engineer they did many tests on seafoam and he was telling me people happy from cleaning everything with it but actually it cleans in a bad way, for example catalytic converters it melt some component in it which cleans it but make ash inside it so if u use it more than 2 times same way it melts the catalytic converter and then u need to replace it, its not a safe chemical, there is some better quality products that does not harm the system but for them they just used TUV certified products...

  14. #14
    Join Date
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    Cool

    Seafoam is okay and wont hurt anything, I fogged the motor several times and the catalytic converter passed no problem, however I have switched to better than seafoam- and add an ounce or so at filling stations with an additive to gasoline that has PEA(polyetheramine) in it, it will clean your motor and fuel system, Gumout, Royal Purple and several others feature it, look for PEA its the top of cleaners so far.

    Randy
    Last edited by 320iAman; 06-21-2017 at 09:58 PM.

  15. #15
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    i will have to give Royal Purple a try in all my vehicles.

  16. #16
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    At least for in tank additive in my K-jet 320i I use Lucas Gas treatment.

    I like it because it's thicker, and feels oily to the touch. It seems to quiet my OEM fuel pump for a lot of time.

    Looks like it had lubrication and cleaning capabilities. At least being K-jet mechanical also internal lubrication while cleaning sounds good in theory.

  17. #17
    Join Date
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    Quote Originally Posted by 320iAman View Post
    Seafoam comes is spray or liquid in a can either can be used to fog the motor. I have done this several times and its a good idea. There is also Gumout which is better as it has "PEA" which is a cleaning agent. The point of fogging the motor is to reduce carbon deposits on the cylinder tops or pistons, both have upper cylinder lubricant. I have done this several times and it does not harm anything in fact it helps the motor and reduces carbon deposits.

    To decarbonize the pistons or reduce the amount on the piston tops , remove the rubber plug underneath the the throttlebody and put a rubber hose into the can of seafoam and put the other end into the throttlebody, block the opening into the throttlebody around the rubber hose going in to block air, then start the car and with your hand grab the accelerator cable arm and pull it to rev the motor up too 2000 rpms or so , so that the motor wont stall,then swirl the can to feel the liquid being drawn in by vacuum into the throttle body, a lot of smoke will start to come out the tail pipe, I mean tremendous amount, keep the car running until the can is empty or 1/2 way then release the accelerator cable arm and remove the rag and hose from the opening, the car will die, then plug up hole, wait about 5-10 minutes and restart the car and take it for a drive, do spirited driving---floor the gas pedal,lol and you'll see the smoke again, drive until no smoke a few minutes, you have started to decarbonize the piston tops which will improve the engine performance and reduce NOX and so forth. This will also cool the engine down a little.

    Spray can same thing. Putting in the gas tank will clean the fuel injectors and the gas lines. I have done this several times before smogging the car it helps, plus reduces carbon on the piston tops which robs performance if too heavy.

    Milton something else was wrong with your engine,this stuff or Gumout with PEA, better fogging agent cant screw with your motor or catalytic converter or o2 sensor or anything else. Dirt and contaminants cannot keep your motor in good shape.

    carbon deposits on the piston tops is normal for internal combustion motors, taking the head off and removing the carbon deposits is a temporary fix, within a month or two its back again, you want to keep it in check and not let it buildup way too much.

    In conclusion, put in gas tank to clean the fuel system including injectors and fog the motor to reduce carbon deposits on the piston tops and some on the valves and elsewhere and keep it going, this is not a one time fix and its all gone, put in a ounce or so on each fillling station visit fill up.

    ATF was used for along time, yet it burns too hot, this oil based stuff does not burn too hot.

    As to keeping the engine internals clean change your oil filter more often( or use wix oil filter and change every 6 months), oil sludge belongs in the oil filter not the oil pan or in the motor.

    Robert you know this, oh its your Irish coffee too much Irish and not enough coffee,,lol.

    Randy
    Is this where your taking about? Capped port on the throttle body?





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