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Electric motors vs internal combustion engines

  1. Aug 20, 2017 #1
    On average, which has higher power to weight ratio between the two? So on average, if both weighed the same, which one is going to have more power?
     
  2. jcsd
  3. Aug 20, 2017 #2

    anorlunda

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    An electric motor has more power to weight
     
  4. Aug 20, 2017 #3

    anorlunda

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    But an internal combustion engine plus a tank of fuel usually has more energy to weight ratio than an electric motor plus battery.
     
  5. Aug 20, 2017 #4

    Vanadium 50

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    By a huge factor. My battery pack weighs 275 pounds, but my fuel weighs 60 - and will take the car 20x farther. Indeed, the battery pack and the engine weigh about the same, and the motor and the gas weigh about the same.
     
  6. Aug 22, 2017 #5

    CWatters

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  7. Aug 22, 2017 #6

    mheslep

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    True, though the 'fuel' portion gets on the scale with quite a bit of a necessary baggage that the EV portion does not need: fuel n water pumps, fuel and oil and air filters, carburation or fuel injection, exhaust system, high power heat rejection, starter system, multi gear transmission, differential. Last, the ICE itself is perhaps double or triple the mass of the E motor (4x in your case?).
     
  8. Aug 22, 2017 #7

    anorlunda

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    The OP gave no clues as to context. We speculate when we think he means vehicles.
     
  9. Aug 22, 2017 #8
  10. Aug 22, 2017 #9

    CWatters

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    It did. It was a best of three runs. 2:1 to the Tesla.
     
  11. Aug 23, 2017 #10
    If it was done without recharging then it is a better result. You see incredible times for some electric vehicles but they can only do one run.

    Cheers
     
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