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Diesel particulate emissions

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    #32
    Matt Simis
    Registered Users Posts: 8,718 ✭✭✭Matt Simis


    JHMEG wrote: »
    I'm surprised you think it would be clean, based on replies like this:

    "If however somebody were to hang out the back to collect a sample while I was driving up a hill at full turbo boost, they wouldn't need a tissue, but a bucket"

    I've yet to see a diesel that doesn't put out plumes of smoke on WOT, and letting off WOT, as per the above replies.


    Lol.

    - I never said clean, I said not black.
    - You dont know what WOT means or you think diesels redline at 2k rpm
    - The replies, if you read them, said under load (driving) + WOT + uphill = smoke. More smoke from older cars.


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    #33
    JHMEG
    Closed Accounts Posts: 7,686 ✭✭✭JHMEG


    Matt Simis wrote: »
    The replies, if you read them, said under load (driving) + WOT + uphill = smoke. More smoke from older cars.
    One reply actually said that. The rest is based on my experience of seeing diesels in action. Old or new.

    WOT applies to petrols. You can be pedantic about it, but you know what I mean, I think. Otoh, WOT has nothing to do with redlines... do you know what WOT means?


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    #34
    Matt Simis
    Registered Users Posts: 8,718 ✭✭✭Matt Simis


    JHMEG wrote: »
    One reply actually said that. The rest is based on my experience of seeing diesels in action. Old or new.

    WOT applies to petrols. You can be pedantic about it, but you know what I mean, I think. Otoh, WOT has nothing to do with redlines... do you know what WOT means?

    It isnt as mysterious as you like to allude.
    "In the case of an automobile, WOT is when the accelerator is depressed fully."
    http://en.wikipedia.org/wiki/Wide_Open_Throttle

    To get to and hold 2krpm, one wouldnt depress the accelerator fully now would you.

    I tried the 2k rpm + tissue test stationary, there was absolutely zero visable soot on the tissue or coming from the exhaust. I could only hold it about 4seconds (due to exhaust heat burning my hands) as there is only so much personal injury Ill tolerate for the sake of argument.


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    #35
    peasant
    Registered Users Posts: 17,819 ✭✭✭✭peasant


    To be fair to modern diesels now ...my yoke is purely mechanical. No clever sensors and computer programmes to optimise everything, more turbo boost means more fuel, regardless if it's actually needed or not.
    So, modern diesels are a lot more efficient plus most of them do have filters.


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    #36
    JHMEG
    Closed Accounts Posts: 7,686 ✭✭✭JHMEG


    Matt Simis wrote: »
    It isnt as mysterious as you like to allude.
    "In the case of an automobile, WOT is when the accelerator is depressed fully."
    http://en.wikipedia.org/wiki/Wide_Open_Throttle

    To get to and hold 2krpm, one wouldnt depress the accelerator fully now would you.

    I tried the 2k rpm + tissue test stationary, there was absolutely zero visable soot on the tissue or coming from the exhaust. I could only hold it about 4seconds (due to exhaust heat burning my hands) as there is only so much personal injury Ill tolerate for the sake of argument.

    WOT = wide open throttle, often taken to mean foot to the floor, but it literally means the throttle is wide open. BUT, petrol engines have throttles, diesel engines don't. It's not clear from your posts whether you know that or not about diesels, tho I suspect not.

    Of course one wouldn't depress the accelerator fully to maintain an engine speed of 2000 rpm in normal circumstances. However one can depress the acceleator fully in a high enough gear and achieve "WOT" at 2000 rpm, and depending on the load and gear even maintain it.

    Now, that's me done with this thread. It's turning into a silly game of semantics.


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