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    #31
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    torque it the rotational force applied on something turning, as dd said on the crankshaft in the case of an engine..the top gear test they did on the evo was a joke as without the correct gearing the torque cannot be used ...just my opinion but clarkson is an absolute to55er.
     
     

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    its mind boggling stuff...

    but a diesel engine is severely limited by its own inherant design and function..

    to have a high BHP but lower torque you need a higher rev range but that means a higher revving engine needs lighter components but diesels are high torque because of the rev range and strength required of the engine to handle the small rev range and high torque..

    basically if somebody designed a lightweight diesel engine with a bigger rev range the diesel combustion proccess and torque would grenade it anyway, power and torque versus the strength of the components and the engine weight and mass needed to handle it in the first place...
    330i sport a big chunk of berlin...

     
     

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    talking of cranks,,,ive just watched it again
     
     

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    Quote Originally Posted by honblade884 View Post
    talking of cranks,,,ive just watched it again
    cranks or crank?

    crank with J statham is a classic...
    330i sport a big chunk of berlin...

     
     

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    does derv not produce higher torque due to it burning and giving the piston a "constant" push all the way down the cylinder as opposed to petrol " exploding" and just giving the piston a "jolt" for want of a better word...DD ??
     
     

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    Quote Originally Posted by alan7869 View Post
    does derv not produce higher torque due to it burning and giving the piston a "constant" push all the way down the cylinder as opposed to petrol " exploding" and just giving the piston a "jolt" for want of a better word...DD ??
    not strictly true mate its more to do with compression and fuel pressure, the size of the piston faces and the bore and stroke of the engine the longer the stroke the higher the torque...

    diesels are limited in RPM because of the above and engine mass to handle the diesel combustion proccess and function, you cannot rev one any higher or it would self destruct from the engine mass and weight..you can only rev an engine higher if the components are light in weight and mass but you cannot have lightweight low mass components for the strength required in a diesel engine in the first place..

    sounds like gobbledy gook but you cannot have high rpm and high weight and engine mass in the same equation...
    330i sport a big chunk of berlin...

     
     

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    No not gobbldeygook..have what you are saying...makes sense to me. take it thats one reason high revvin engines are usually " over square"
     
     

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    Quote Originally Posted by alan7869 View Post
    take it thats one reason high revvin engines are usually " over square"

    correct and in a nutshell...

    blueprinting the engine is refining the engine mass and weight proccess etc at component level between components to increase RPM range and BHP even further which would be lost thru vibration etc of unbalanced parts...


    a perfect example of power and torque and engine mass characteristics and a sort of perverse type blueprinting is a rotary engine...

    no engine component imbalances (everything rotates in the same directional plain), high revving ,small cubic capacity but high BHP but zero torque! and flat as a turd at low RPM because of the low engine mass and internals and the essential definition of the physics of an engine that has to be thrashed to death to get what you want out of it... ...
    330i sport a big chunk of berlin...

     
     

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