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Thread: Influence of engine configuration over its performance

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  1. #1
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    Influence of engine configuration over its performance

    Excuse my ignorance, but can someone here explain this to me.

    1st, let me limit what i mean by "performace" into:
    1. peak HP
    2. peak torque
    3. max rev
    4. powerband range (HP)
    5. torque range in powerband
    6. vibration levels

    The question is, given a fix amount of displacement (though varying bore x stroke), say 3000cc, which engine configuration (single piston, v-twin, v3, I4, v4, boxer 4, v5, v6, v12 etc etc etc) will excel in each category? which configuration will give the best compromise?

    why are v8's regarded as torquey?

    also, for the sake of argument, all engine will be naturally aspirated though any cam technology can apply (vtec, vtc, variocam, etc etc).

    am i making any sense?

  2. #2
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    You're making sense, but there's a lot of information to divulge here. Have you tried www.howstuffworks.com yet? A good basics there. Also, you could trawl the technical forums here for similar threads, there have been several on this kind of topc.

  3. #3
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    Quote Originally Posted by pimento
    You're making sense, but there's a lot of information to divulge here. Have you tried www.howstuffworks.com yet? A good basics there. Also, you could trawl the technical forums here for similar threads, there have been several on this kind of topc.
    lol a classic response, "visist the website howstuffworks.com" lol
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  4. #4
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    This is a VERY complicated issue, because in a perfect world, all the configurations should behave the same, but in real life, this is not even close to the truth. There are a lot of physical factors which alter characteristics and I can't even begin to get into them.

  5. #5
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    From what I have read, engine packaging for everyday cars are mostly influenced by packaging constraints, tooling and cost.

    However, for performance cars and racing cars, the engine configuration has something to do with the performance it delivers. Back in the days when F1 had a wider choice of engine configuration, it is said that V8's have the highest torque ratings, but lowest revs capability (thus lesser power) that's why they mostly exceled in twisty circuits (monaco for example). While a V12 is the smootest and where best suited for long straights (monza?) but suffer from to much frictional loses that's why V10's where the best compromise... I am just wondering why this is so?

  6. #6
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    ok ........for starters theres it no such thing as a V5 engine.....and everything else has been said that is in my vocabulary
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  7. #7
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    Quote Originally Posted by GTR Dreamer
    ok ........for starters theres it no such thing as a V5 engine.....and everything else has been said that is in my vocabulary
    I thought VW had a V5?
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  8. #8
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    Quote Originally Posted by GTR Dreamer
    ok ........for starters theres it no such thing as a V5 engine.....and everything else has been said that is in my vocabulary
    Oh but there is. The new Jetta V will have a 2.5 liter V5 motor.

    http://www.motoring.co.za/index.php?...879&fSetId=381
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  9. #9
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    Honda's motogp contender is a V5... I think ducati uses a V3 or V2...

  10. #10
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    but how does that work? and whats the point?
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  11. #11
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    what's the point of what? a V5? I dunno, that's why I asked. There is a point, I am sure of that, since a top MotoGP contender like honda chose to do it... The same thing that other teams chose to go another route (Yamaha has an I4, Ducati a V2orV3?)... Obviously, there's a difference, but what? that's what I want to know. what's to compromise of going one way from the other...

  12. #12
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    In a zig-zag arrangment, I think. It's probably the VR6 block with one cylinder lopped off. The point is a larger engine than the 2 litre I4, yet it can share parts with it.

  13. #13
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    Quote Originally Posted by pimento
    In a zig-zag arrangment, I think. It's probably the VR6 block with one cylinder lopped off. The point is a larger engine than the 2 litre I4, yet it can share parts with it.
    but wouldnt a V5 be off balance?
    pondering things

  14. #14
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    Quote Originally Posted by targa
    but wouldnt a V5 be off balance?
    depends on the crank and the firign order.
    In one configuration it's possible to have an OVERLAP of the combustion cycles which actually helps smooth some of it out.
    I dont' know what the VW does.
    The Honda V5 bike is raced with differeing crank angles and firing orders to suit different tracks performance needs
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  15. #15
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    Quote Originally Posted by Matra et Alpine
    depends on the crank and the firign order.
    In one configuration it's possible to have an OVERLAP of the combustion cycles which actually helps smooth some of it out.
    I dont' know what the VW does.
    The Honda V5 bike is raced with differeing crank angles and firing orders to suit different tracks performance needs

    Doesn't Honda also has different sized pistons in the two banks.
    The bank with two pistons are larger than those in hte bank of three.

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