GM unveils diesel-like gasoline engines

Discussion in 'OT Driven' started by nuclear, Sep 4, 2007.

  1. nuclear

    nuclear OT Supporter

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    Drivable concept versions of General Motors cars that use efficient new engines with HCCI technology revealed Friday.


    NEW YORK (CNNMoney.com) -- General Motors revealed two drivable concept cars with new engines that burn gasoline in virtually the same way that a diesel engine burns diesel fuel.
    The engines will get 15-percent better fuel economy than ordinary gasoline engines, GM estimates, but will not need the expensive exhaust treatment that diesel engines require.
    Several car companies have been working on this type of engine technology, commonly known as homogeneous charge compression ignition, or HCCI. The technology promises the fuel economy of a diesel engine, which is typically much more efficient than a gasoline engine, but with the much cleaner exhaust of a gasoline engine.
    In an HCCI engine, gasoline is ignited inside the cylinder using compression and the engine's own heat without the need of a spark. This is the same way that a diesel engine ignites diesel fuel. (When the engine is first started, and until it warms up, GM's HCCI engine still uses a spark to ignite the fuel.)
    This type of ignition results in more energy to propel the vehicle because the fuel burns with less heat and light, which wastes energy, and because there is more compression when the fuel is ignited and, therefore, more of a push when the fuel and air expand.
    "I remember debating the limits of combustion capability when I was in college," Tom Stephens, group vice president, GM Powertrain and Quality, said in a company statement. "HCCI was just a dream then. Today, using math-based predictive analysis and other tools, we are beginning to see how we can make this technology real."
    The vehicles GM showed Friday are a Saturn Aura and an Opel Vectra, two virtually identical mid-sized sedans, both equipped with 180-horsepower 2.2-liter four cylinder HCCI engines.
    They can drive at up to roughly 55 miles per hour using diesel-like ignition but will have to rely on traditional spark ignition at higher speeds or under heavy loads, GM said.
    "Perhaps the biggest challenge of HCCI is controlling the combustion process," said Dr. Uwe Grebe, executive director for GM Powertrain Advanced Engineering.
    Engineers hope to increase operating range under HCCI and improve performance under cold weather and high-altitude conditions, the company said.
     
  2. Jim311

    Jim311 New Member

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  3. MrRyan

    MrRyan Gary Johnson 2016 OT Supporter

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    No shit?
     
  4. ACLdestroyer

    ACLdestroyer OT Supporter

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    interesting.
     
  5. BigT

    BigT LSX Crew

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    welcome to last week. :hsugh:
     
  6. Fotenks

    Fotenks New Member

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    They need to get quasi-turbines working, combustion by detonation would give you crazy amounts of horsepower with insanely good MPG :bowdown:
     
  7. PurpleSplat

    PurpleSplat Guest

  8. Eskimo Yo-Yo

    Eskimo Yo-Yo absent OT Supporter

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    pretty cool
     
  9. nuclear

    nuclear OT Supporter

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    welcome to: nothing came up in search
     
  10. srfrogger

    srfrogger New Member

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    They just need to get this shit to market, something GM has had issues with for a long time.
     
  11. Josepi

    Josepi HA HA, I CHANGED MY AV

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    They just need to pull a reliant again. Super cheap transport for the masses.
     
  12. Stealthy_C

    Stealthy_C my Vespa rocks.. ̔̕̚̕̚ ҉ ҉̵̞̟̠̖̗̘̙̜̝̞̟̠͇̊̋̌̍̎ ̏̐̑̒ OT Supporter

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    They need to get it into the market and not fuck it up. :o
     
  13. twistid

    twistid Banged By Super Models Moderator

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    again???
     
  14. Josepi

    Josepi HA HA, I CHANGED MY AV

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    cheap price, not quality :mamoru:
     
  15. twistid

    twistid Banged By Super Models Moderator

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    the reliant(k car) was a chrysler product, that's why i was asking.
     
  16. Josepi

    Josepi HA HA, I CHANGED MY AV

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    so close, yet so far. :wtc:
     
  17. GregFarz78

    GregFarz78 New Member

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    404 trishield not found
     
  18. borborygmus

    borborygmus Guest

    yay detonation!
     
  19. twistid

    twistid Banged By Super Models Moderator

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    the k car, and the creation of the minivan saved chrysler.
     
  20. e.pie

    e.pie Active Member

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    quasi-turbines :bowdown:
     
  21. m0untaind3w

    m0untaind3w OT Supporter

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    So it only works once its 100% warmed up, under 55mph, and only under partial load. Excellent...
     
  22. jelloslug

    jelloslug OT Supporter

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    Kinda like a hybrid.
     
  23. Jumpem

    Jumpem OT Supporter

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    How about they simply start offering cars with diesel engines. :uh:
     
  24. therealciviczc

    therealciviczc New Member

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    This seems like a huge waste of time and effort. Why not wait until it was perfected and somewhat useful before bringing it out. Who drives at a consistant speed under 55mph for any significant period of time?

    Anyone remember when GM brought out their diesel cars back in the day. They sucked so bad that they basically ruined the diesel motor for the US market for many years. We still don't see them like you see them in other countries. I hope they don't do the same for this concept.
     
  25. nuclear

    nuclear OT Supporter

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    emissions regulations are different in the U.S. than they are in Europe
     

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