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  • JaaTBoYSliM

    Member • Nov 17, 2009

    Your typical 4 cycle diesel is turbocharged, fuel injected, and in america runs on low sulfur diesel. Most diesel's have a compression ratio of 22.5 to one or better, this additional compression requires a heavier casting in the vital area's surrounding and supporting the combustion chamber. It also is going to necessitate the use of a heavier crankshaft, bearings and journals, and heavier pistons and rings to attain/maintain compression. Diesel fuel does not burn like gasoline you can extinguish a cigarette in a cup of it (although not advised) Diesel will com bust quite easily at or above 22.5to one compression when the diesel is forced through a small orifice at high speed and pressure.
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  • krishthd

    Member • Nov 21, 2009

    Diesel engines generally produce more power than petrol engines.To withstand the heavy stresses induced in machine parts, they r made of heavier elements.
    As said the compression ratio is also more so dont u think they shud b heavy strong..
    All diesel engines need not b turbocharged.
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  • kumar_nitin

    Member • Nov 21, 2009

    I really like mechanical engineering alongwith civil, but Unfortunately Iam a CS engineer..
    anyways, thank you Mr. Jaat boy for such an awsum explanation.
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  • raj87verma88

    Member • Nov 21, 2009

    Nice answers, nothing more to add.
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  • abhishek. sharma

    Member • Jan 15, 2010

    goooood ans. by mr jaatboy
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  • JaaTBoYSliM

    Member • Jan 16, 2010

    kumar_nitin
    I really like mechanical engineering alongwith civil, but Unfortunately Iam a CS engineer..
    anyways, thank you Mr. Jaat boy for such an awsum explanation.

    Well prateek .. How can I get #-Link-Snipped-# ?
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  • Vega

    Member • Jan 16, 2010

    Diesel engines run at high compression ratios causing very high pressure at the end of compression stroke. To withstand this pressure, diesel engine parts need to be heavy which makes it heavy and robust.
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  • antenna

    Member • Jan 16, 2010

    To have compression ratio as large as 22, we need to have a heavier flywheel to provide enough torque especially when we don't have the power stroke.
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  • einstein89

    Member • Jan 23, 2010

    compression ratio of diesel engine is around 22.where as for petrol its around 9.
    higher compression ratio means higher mean effective pressure.higher temperature and high stresses for which the engine must be made highly rigid and strong.which is the main reason which increases its weight.its large,bulky but it sustains very high pressures.
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  • ShrinkDWorld

    Member • Jan 25, 2010

    good ans by einstein89
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