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Thread: Mazda - engine breakthrough

  1. #1
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    Default Mazda - engine breakthrough

    So they say. A compression-ignition gasoline engine --

    https://www.yahoo.com/finance/news/m...141200856.html
    David G
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  2. #2
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    Default Re: Mazda - engine breakthrough

    Zoom zoom!
    Simpler is better, except when complicated looks really cool.

  3. #3
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    Default Re: Mazda - engine breakthrough

    Hyundai developed one about two years ago. It's been a long-running goal for many auto companies. Might note that most model airplane motors were compression-ignition, burning methanol.

  4. #4
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    Default Re: Mazda - engine breakthrough

    We'll see if they make it workable... but they seem mighty optimistic, saying it'll be here in 2019.
    David G
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    "It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)

  5. #5
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    Default Re: Mazda - engine breakthrough

    FWIW, Mazda as been producing diesels and gasoline engines with the same compression ratio for several years. The difference between a DI gasoline engine and one burning diesel fuel isn't all that great. Gasoline-fueled engines tend to be less expensive, mainly due to the lower-cost fuel system.

  6. #6
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    Default Re: Mazda - engine breakthrough

    If they achieve the fuel savings they are touting whilst maintaining drivability, it really is a remarkable achievement. Gone are the days of the " gas-guzzling dinosaurs ".
    Gerard>
    Everett, WA

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  7. #7
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    Default Re: Mazda - engine breakthrough

    I wonder whether the ignition temperatures will be as high as in a diesel.
    The row about pollution from diesels in Europe is due to the high temperatures oxidising nitrogen. Could be a dead end advance.

    Levels of NOx, emitted mostly by diesel vehicles, have been illegally high in 90% of the UKs urban areas since 2010. The toxic fumes are estimated to cause 23,500 early deaths a year and the problem has been called a public health emergency by a cross-party committee of MPs.
    It really is quite difficult to build an ugly wooden boat.

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  8. #8
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    Default Re: Mazda - engine breakthrough

    Why would the ignition temps be as high when gasoline has a significantly lower ignition temperature?
    ?
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  9. #9
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    Default Re: Mazda - engine breakthrough

    Did some research, petrol is hotter, unless they use some trick like hot bulb ignition.
    The Self Ignition auto ignition temperature is lowest temperature at which a fuel such as petrol or diesel spontaneously ignites in normal atmosphere without an external source of ignition, such as a flame or spark.

    • Self ignition temperature of petrol is 247–280C.
    • Self ignition temperature of diesel is around 210C.

    So as seen, diesel has low self ignition temperature, and that's why diesel engine doesn't have a spark plug
    It really is quite difficult to build an ugly wooden boat.

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  10. #10
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    Default Re: Mazda - engine breakthrough

    The article has a link in the first line on the word "working", its really cool. Infiniti is developing a variable compression engine where the piston's reach is changed based on the current need.

    https://www.engadget.com/2016/08/14/...-turbo-engine/

  11. #11
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    Default Re: Mazda - engine breakthrough

    Ho-Hum, another technological miracle from the PR Department.

    Footnotes:
    *3 Engine is still under development and figures are subject to change.

    Mazda Skyactiv-X Engine (LINK)

    Mercedes DiesOtto Engine (2007) (LINK)

    .
    .

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  12. #12
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    Default Re: Mazda - engine breakthrough

    Quote Originally Posted by Dan McCosh View Post
    Hyundai developed one about two years ago. It's been a long-running goal for many auto companies. Might note that most model airplane motors were compression-ignition, burning methanol.
    The compression-ignition (wrongly termed Diesel) model plane engines rely on ether in the fuel mix to achieve ignition. The methanol/castor engines rely on glow plugs.

  13. #13
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    Default Re: Mazda - engine breakthrough

    This might not seem related and those of you without an interest in current Formula 1 might not have known it went on http://www.f1technical.net/news/20316 .The change to direct injection of fuel rather than port or inlet injection reduced the risk of detonation that was likely with compression ratios above about 13:1.The current regulations for Formula 1 stipulate that the compression ratio is not to exceed 18:1 and this is with a turbocharged engine.Now you could consider that an engine strongly compressing and having fuel injected into a pre-combustion chamber is on the verge of being a diesel and I have to wonder if the spark is absolutely necessary.By an interesting quirk,the direct fuel injection racing engine was refined by Audi and the commercial application by Mahle,both companies within the Volkswagen portfolio.I believe their diesels have been a bit controversial though.

  14. #14
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    Default Re: Mazda - engine breakthrough

    Quote Originally Posted by Dan McCosh View Post
    Hyundai developed one about two years ago. It's been a long-running goal for many auto companies. Might note that most model airplane motors were compression-ignition, burning methanol.
    The ignition on model airplane motors, at least the 2 stroke ones not known as "diesel" is assisted by glow plugs, a hot wire maintained by the heat of the previous combustions. Much like a "hot bulb" engine.

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  15. #15
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    Default Re: Mazda - engine breakthrough

    Looks useful where people are already maximizing the efficiency of auto transportation.


    http://www.independent.co.uk/news/uk...-a7878306.html

  16. #16
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    Default Re: Mazda - engine breakthrough

    Quote Originally Posted by LeeG View Post
    Looks useful where people are already maximizing the efficiency of auto transportation.


    http://www.independent.co.uk/news/uk...-a7878306.html
    Hence my comment about temperature and NOx pollution.
    It really is quite difficult to build an ugly wooden boat.

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  17. #17
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    Default Re: Mazda - engine breakthrough

    Quote Originally Posted by Gerarddm View Post
    Gone are the days of the " gas-guzzling dinosaurs ".
    Really? Have you seen the monster pickup trucks they sell these days? It's a big piece of the market.

  18. #18
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    Default Re: Mazda - engine breakthrough

    Quote Originally Posted by birlinn View Post
    The compression-ignition (wrongly termed Diesel) model plane engines rely on ether in the fuel mix to achieve ignition. The methanol/castor engines rely on glow plugs.
    A compression ignition engine is a diesel. The particular fuel used is inconsequential to the nomenclature. If I recall correctly the first compression ignition engine ran on coal dust.
    I'll just take my chances with those salt water joys.

    AR

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