ULTIMATE Petrol vs Diesel thread - Comparisons - Page 16





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  1. #301
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    Jengel,

    In road going small vehicles (cars and SUV's), engine performance specs are dominated by the need to be flexible and to be operated by anybody, from old grannies to young roughnecks. That is why so much research is going into constant velocity gearboxes. Industrial engines can be designed to operate in a very small rev range. Those big ship diesels will only be required to operate at 650RPM and nothing else. Also consider that petrol poses a huge fire hazard, when compared to diesel - another reason to opt for diesel motors on a ship.

    On a trip to Venezuela a few years ago I was amazed at how many trucks and buses had wonderful sounding petrol V8 engines. Petrol being cheap of course.

    The many graphs and tables of figures in this thread convincingly show that diesel engines do not have a torque or power advantage over their "sister" petrol engines. As for torque at idle speed - when I had a 3.5V6 blister fender Pajero, I took a similar Tdi for a test. There was a pavement to climb for the cars to get in and out of where they were parked. My 3.5V6 idled over the pavement, but the Tdi had to be revved and slipped on the clutch.

    The real big and undeniable advantage of diesel is fuel consumption and thus range. Another reason why I would stick diesel engines in a ship if I was the designer.

    Roelf

  2. #302
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    I'm not going to get involved in this one...
    Diesels used to drive alternators at fixed and low rpm.
    No one ever said a petrol was suitable for tractors or trucks. This is where diesels shine.
    Manufacturers focus on turbo diesels because they're greener than petrols, and the market demands for greener vehicles is increasing.
    But to compare an oil tanker engine to a car engine. No, I won't get drawn into that. To even compare a smallish tractor to a car is absurd. I can just aswell say that all airliners use paraffin and run turbofans. That must be what we should be using.
    Last edited by RedLineR; 2011/05/02 at 10:43 AM.
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    Eurard: For T=2; T=1 but, 1/2T=

  3. #303
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    The Fortuner Comparison (Page 1) Excel file has been updated to the latest rendition.
    SWAMBO
    2009 Suzuki Grand Vitara 3.2i V6 Auto
    Me
    2003 Ford Focus 2.0

    Eurard: For T=2; T=1 but, 1/2T=

  4. #304
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    The Pajero comparison on Page 1 has also been updated with the latest file.
    It has an additional graph that compares performance at reef altitutde as requested by a poster.
    It really does make the good case for the diesel.
    It is clear from the gradient of ability graphs that the diesel can maintain speeds in 4th and 5th on steeper hills than the petrol at mid-range rpm.
    There is however an amount of km that has to becovered before the diesel can break even with the petrol, coupled to a shorter service interval.
    Though the petrol still outperforms the diesel in terms of performance, this model does make a good argument for drivability.
    Last edited by RedLineR; 2011/05/02 at 12:09 PM.
    SWAMBO
    2009 Suzuki Grand Vitara 3.2i V6 Auto
    Me
    2003 Ford Focus 2.0

    Eurard: For T=2; T=1 but, 1/2T=

  5. #305
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    The Triton xls file on Page 1 has been updated!
    It really does make the good case for the diesel.
    It is clear from the gradient of ability graphs that the diesel can maintain speeds in 4th and 5th on steeper hills than the petrol at mid-range rpm.
    There is however an amount of km that has to becovered before the diesel can break even with the petrol, coupled to a shorter service interval.
    Though the petrol still outperforms the diesel in terms of performance, this model does make a good argument for drivability.
    SWAMBO
    2009 Suzuki Grand Vitara 3.2i V6 Auto
    Me
    2003 Ford Focus 2.0

    Eurard: For T=2; T=1 but, 1/2T=

  6. #306
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    Thanks to BoyScout, we now have our first comparison of a smaller petrol engine, with a larger turbo diesel!
    It's the Nissan NP300. Have a look at it on Page 1!

    Thanks BoyScout!
    SWAMBO
    2009 Suzuki Grand Vitara 3.2i V6 Auto
    Me
    2003 Ford Focus 2.0

    Eurard: For T=2; T=1 but, 1/2T=

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