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Thread: Info on some Engine Terms!!

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    Default Info on some Engine Terms!!

    hi guys!!

    i want some info on ENGINE TERMS and specially abt the engine of bikes....here they are....and please make me understand well...as i know sh*t about the engines also mention HIGHER is better or LOWER....

    1: Bore
    2: Stroke
    3: Ground Clearance
    4: WheelBase
    5: Compression Ratio
    6: And the final one is "Teh difference between OHC and OHV engines"

    Thnx in advance...


    (language edited by admin/mods)
    Da OnE aT iTz XtReMez....

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    Bore=it is the width of the cylinder where the piston moves up and down... the cylinder itself is referred to as bore sumtimes...

    stroke=stroke is the distance the piston travels up and down... depth of the bore...

    ground clearance.= the height of the vehicles surface. the space between road and the vehicle surface

    wheelbase=distance between the two wheels... the larger the wheelbase.. the wider the car..

    compression ratio= it is the ratio of the area above the piston when it has fully moved down.. and when it is at the top

    OHC is overhead cam... cam is wat determines when to open the intake and exaust valves on each cylinder...

    the counter part is DOHC(or Twin cam)=Dual overhead cam.. this uses two separates cams.. one for intake valves..and other for exaust valves... to vary their angle on the piston top for increased efficiency
    Do the environment a favour, Use less airconditioning .. and please walk to the shop to get a pack of cigarretes..its only a 3 min walk..

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    Default

    you also asked OHV

    OHV means over head valves... driven by a cam inside the engine block..not on the head...


    for illustration

    http://www.samarins.com/glossary/dohc.html
    Do the environment a favour, Use less airconditioning .. and please walk to the shop to get a pack of cigarretes..its only a 3 min walk..

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    correection...
    wheelbase=distance between the two wheels... the larger the wheelbase.. the wider the car..

    its the distance between the front and the rear wheels... the greater the distance the longer the wheel base the longer the car....

    the distance between two front or two rear wheels is the track, the greater the distence the wider the car...
    its all about power to weight ratio...

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    Honda 125 Uses OHV engine the problem with this engine is that at higher RPM the valve loses their timings so its not a very favorite design of most engine makers but Honda is using them very successfully and the better newer design is OHC...

    Another thing i would like to add about compression ratio basically the more compression ratio the better the torque will be as u can see with Diesel engines bcoz they have high compression ratio they have torque much higher than Petrol cars.. Torque u can say its very useful when climbing hills or initial pick of the vehicle..
    Speed costs money, how fast can you afford to go.

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    @ghuncha

    thanks 4 correction.


    The distance from the center of the front wheel to that of the rear wheel in a motor vehicle, usually expressed in inches.

    http://www.answers.com/topic/wheelbase
    Do the environment a favour, Use less airconditioning .. and please walk to the shop to get a pack of cigarretes..its only a 3 min walk..

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    @ all

    thank you buddies for ur informative replies...1 thing i want to ask more...

    if we are comparing two vehicles,say two bikes of same CCs,but they have different BORE STROKE....1 bike has bigger Bore and other one has bigger Stroke...which one should be preferred? the one with bigger bore or one with bigger stroke?? and tell me are they (Bore and Stroke) directly proportional to each other??i mean is it so that the bigger the bore,bigger will be the stroke??

    and also tell me which one affects more on performance?bigger bore increases performance or bigger stroke?? waiting for your replies...THNX
    Da OnE aT iTz XtReMez....

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    Default

    Assuming two similar 4 stroke engines:

    Short stroke (thus larger bore)=short piston travel=higher top RPM=lower torque [pulling power]

    Long stroke (thus smaller bore)=long piston travel=lower top RPM=higher torque [pulling power]

    Is this adecemic 'cos most multi cylinder 4 stroke bikes will have +/- 10% the same bore/stroke. Thats small enough not to make a huge diff in performance.

    The diff however is felt if one compares for example the earlier Yamha RD200 and the Honda CD200.

    The comp ratio plays a bigger role and thus has a bigger impact on performance.

    Think of it as a size of AREA WHERE COMPRESSED PET/AIR IS SQUASHED in before the spark plug ignites making the piston travel down.

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