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Thread: Natural gas vehicles (NGVs, CNG)

  1. #51
    Model X #1417
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    Quote Originally Posted by jerry33 View Post
    The motivation--and I think financing--for developing the diesel engine was to use coal (liquified) as a fuel.
    Actually Diesel originally intended to use powdered coal blown into the cylinder by compressed air, compression ignited. That didn't work so he went to liquid fuel in desperation as I understand it.

  2. #52
    Head Moderator / Administrator doug's Avatar
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  3. #53
    mod squad TEG's Avatar
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    Hmmm... They don't quote MPG or power output for these vehicles. Engine tuning for CNG compared to gasoline is better off optimized for one or the other. For instance, do they use the same compression ratio for both types of fuel? (CNG works better with higher compression.)
    The article states that these are not electrically powered at all, rather just "bi-fuel" ICE vehicles that can switch from CNG to gasoline automatically when the CNG runs out.

    This doesn't feel like a step forward. I think plug-in gas-electric hybrids would be a better solution. Among other things, with an electric hybrid system you get efficiency improvements from regen braking, engine auto stop at low speeds, etc. Efficiency is much better when running electric drive, and the home "refueling/recharging" is more simple with plug-in electric than with CNG.
    Moderator - Roadster, and Future Cars forums

  4. #54
    Head Moderator / Administrator doug's Avatar
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    Agreed, I didn't see much here to be impressed by.

  5. #55
    Model S P2681 qwk's Avatar
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    Wow, talk about manufacturers trying to desperately hold on to their ICE lineup.

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