clear discharge Exhaust terminal: Light or dark? Does it make a difference?

Exhaust terminal: Light or dark? Does it make a difference?


    # 1
    December 3, 2011
    NINODEC
    NINODEC
    The forum essay

        I wanted to ask you if you can solve my curiosity.

        For years I was driving with diesel (company cars), before spending this year on my Giuly petrol (multiair).

        I come to the question, once and I talk about at least 9 to 10 years ago, it was said that when the exhaust pipe of a petrol car was clear / white, it meant that the engine was OK, but it was a bad sign if it was black ... he ate oil, busted carburetion, etc. (the diesels are known to have been perpetually charred); I remembered this fact and I notice that the exhaust of modern gasoline cars are all black diesel type (including mine), why?

        It 's the fault of different petrol, we mean that the lead was cleaner? Or does not it hit the gasoline ?!

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    #2
    December 3, 2011
    Roby 90
    Roby 90
    Beginner Alfista

        Re: Light or dark? Does it make a difference?

        I think it depends mainly on the type of route: if you happen to make short routes, where the exhaust does not heat well, on the terminal there is a lot of condensation that tends to collect some residues of exhaust fumes that form the blackish patina.

        My personal experience is this: on my 145 1.6t.spark of 97, a couple of years ago I used to occasionally use it for very short routes, where the classic black patina was formed and I had to often clean the drain to keep it beautiful shiny. Now, on average I use it less often, but when I use it I do at least a dozen miles on average, and I have not seen the drain get dirty.

        On the 1.6jtdm Mito, which is almost always used on the motorway, despite being a diesel, the exhaust tip has never been blackened.

    # 3
    December 3, 2011
    M @ Urizio
    M @ Urizio
    Maximum expert in mechanics.

        Re: Light or dark? Does it make a difference?

        Roby 90 wrote: ↑

            I think it depends mainly on the type of route: if you happen to make short routes, where the exhaust does not heat well, on the terminal there is a lot of condensation that tends to collect some residues of exhaust fumes that form the blackish patina.

   
On my former 166 TS the opposite happened, circulating at low speed the terminal (inox) was always clean. It was enough to use it on the highway to get the black terminal.

        I explained it to me with the consumption of oil (1 liter every 3,000 km) and the presence of the catalyst.

        In fact, on the old cars with carburetors and without cat the opposite happened and it was a pleasure to see it gray, almost white after a motorway tug.

        : Decoccio:

    # 4
    December 3, 2011
    MaurizioAce
    MaurizioAce
    Beginner Alfista

        Re: Light or dark? Does it make a difference?

        I believe that the exhaust air depends on both a different combustion and the recirculation of the exhaust gas that is now present almost everywhere. Now it is difficult that the fuel does not burn completely and with all the filters there are only the less harmful particles are expelled and therefore the non-burnt hydrocarbons almost no longer clean the terminal. In my Grande Punto Abarth SS the terminals were almost similar to diesel because they were dirty, but in 156 they are much cleaner: good. :

    # 5
    December 5th 2011
    NINODEC
    NINODEC
    The forum essay

        Re: Light or dark? Does it make a difference?

        Roby 90 wrote: ↑

            In my opinion it depends mainly on the type of route ...

        I confirm that I act on the same path, my habits have not changed.

        MaurizioAce wrote: ↑

            ... Now it is difficult that the fuel does not burn completely and with all the filters there are only the less harmful particles are expelled and therefore the non-burnt hydrocarbons are no longer clean the terminal. In my Grande Punto Abarth SS the terminals were almost similar to diesel because they were dirty, but in 156 they are much cleaner: good. :

        Here you have hit the target, on my old Toyota Carina 1.6 petrol, the inside of the terminal was always clean even in the city, if I did the classic Milan - Calabria 1200 km, the exhaust was almost white. This summer I did the same route for the holidays with the Giuly, but the inside of the exhaust has not even cleaned by making a single pull (about 11 0re), nothing ... black like a diesel.

        But I thought that being a more advanced and modern engine, left the "clean" exhaust.
        : Eek :: p: confused:

    # 6
    December 5th 2011
    Roby 90
    Roby 90
    Beginner Alfista

        Re: Light or dark? Does it make a difference?

        NINODEC wrote: ↑

            But I thought that being a more advanced and modern engine, left the "clean" exhaust.
            : Eek :: p: confused:

        In fact, since the cars have more modern emissions than in the past, the exhaust should be kept cleaner, because black is caused by the accumulation of unburnt or partially combustible hydrocarbon residues ...

        I hypothesized that it could depend on the route, because if one makes short journeys, the catalyst works little, the engine makes it less cold, and so even a € 5 engine could leave a fair amount of waste at the exhaust.

        .
It would serve the experience of some other owner of petrol cars of the latest generation to make comparisons.

    # 7
    December 5th 2011
    NINODEC
    NINODEC
    The forum essay

        Re: Light or dark? Does it make a difference?

        Roby 90 wrote: ↑

            It would serve the experience of some other owner of petrol cars of the latest generation to make comparisons.

        One eye I threw it while walking around the "new" cars parked ... all black!

    # 8
    December 5th 2011
    Roby 90
    Roby 90
    Beginner Alfista

        Re: Light or dark? Does it make a difference?

        NINODEC wrote: ↑

            One eye I threw it while walking around the "new" cars parked ... all black!

        Boh, it must be said that there are not many models to have the terminal chrome, like the golf have almost all the black exhaust (even the double) already so and not chrome.
        Then, even among those with a chromed terminal, you have to see how many are there to clean it from time to time, because logically after a long time it becomes dirty.

        But if you clean it for good, how long does it come back to you black?

    # 9
    December 5th 2011
    NINODEC
    NINODEC
    The forum essay

        Re: Light or dark? Does it make a difference?

        Look it's not chrome or black ... I speak of the inside of the tube, which is normally not chrome or black, but more simply colored iron, it is the interior that becomes white / blue or black / diesel. I've never dreamed of cleaning the terminal internally, I do not know about you.