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  1. zzonbi

    cranking a diesel engine by hand

    Yes, it is possible. With the engine on car use the leg crank: give the car a push, then jump in and clutch 2nd gear.
  2. zzonbi

    cylinder scale

    So the output is 63%. Still, where about is the efficiency? It shouldn't be exactly the same, or else we'd have engines n times smaller/lighter of the same output and efficiency (with the mentioned benefits) just by employing downsized cylinders...
  3. zzonbi

    cylinder scale

    similar, at different scale - not equal, just alike Same stress - same piston speed, same heat loss (specific)
  4. zzonbi

    cylinder scale

    What happens to efficiency and output of a mono cylinder engine if it is made similar, but with half the displacement?
  5. zzonbi

    Mazda rx8 wankel efficiency nearly there?

    Not exactly, because it is much more smoother and suffers less wear. But yes, you can play with various combinations of capacity if you correlate them with rpm (and torque, implicitly). Blackbox guessing it's rather turbine or electric (or something with lots of small cylinders).
  6. zzonbi

    Mazda rx8 wankel efficiency nearly there?

    It has 6 chambers, but fired twice as frequent. It is extremely well balanced too, just like a V12. So per rotor revolution it fires as a 12 cyl. The engine wear is more related to rotor speed than shaft speed, 10000rpm is used mostly for bragging. In my opinion 654ccm is the volume of a...
  7. zzonbi

    Mazda rx8 wankel efficiency nearly there?

    For a 360 degrees rotor cycle there are 6 pulses on the Renesis, so it's more like a 12 cylinder, not 6. The whole 1.3l volume is processed, so we have to make the equivalent V12 2.6l. However, it will only have 1/3 of the quoted 10000rpm, hence 3x the torque value. Actually the high shaft revs...

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