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Thread: OHC engines VS OHV engines?

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    Default OHC engines VS OHV engines?

    Aslam O Alaikum friends,
    I have read in some comments about OHV and OHC engines. I also googled it find the full form of OHV and OHC. What I wanna know is
    1) Which one is good in performance and why?
    2) Bikes in Pakistan with OHC/OHV engines?
    3) Can one distinguish between them by seeing it?


    Thanks, in advance.

    And please don't start fight proving that one is better and other is not. I wanna know for my knowledge.


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    Quote Originally Posted by Motorheat View Post
    When I was googling about these things I also found somewhere that Cruiser type motorcycles still prefer OHV engine.
    did they mention if any company is currently using OHV in their recent bike lines???

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    So, the simple problem with OHV engine was that it was not able to breath at high RPM. So they made OHC. Every OHC is indeed OHV but every OHV is not OHC.

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    Quote Originally Posted by gull_s_777 View Post
    did they mention if any company is currently using OHV in their recent bike lines???
    No. I didn't remember. Now I know in what conditions which one is better. Most of companies have moved to OHC.

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    Quote Originally Posted by gull_s_777 View Post
    did they mention if any company is currently using OHV in their recent bike lines???
    harley davidson and royal enfield still using OHV for some models ...

    Quote Originally Posted by Motorheat View Post
    Every OHC is indeed OHV but every OHV is not OHC.
    how can u say that ...both are different.... OHC cant produce the lower end torque like OHV ...and OHV fails to produce higher end torue like OHC....

    Sent from Mars using Telegraph
    Rise from the ashes,.....

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    2013 Harley-Davidson CVO Breakout Specifications and Price - Motorcycle USA

    I think it is OHV engine. It is written in its specs.

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    Quote Originally Posted by getscorpion View Post
    harley davidson and royal enfield still using OHV for some models ...



    how can u say that ...both are different.... OHC cant produce the lower end torque like OHV ...and OHV fails to produce higher end torue like OHC....

    Sent from Mars using Telegraph
    Oka. Thanks for clarifying.

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    Quote Originally Posted by Motorheat View Post
    So all Chondas, CD70, cd100 and gs150 and gd110 are OHCs.
    Thanks for detailed info.
    GS150 and GD110 are also OHC. SOHC and OHC are the same.

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    harley and royal enfield engines date back to the 60s. they aren't good engines they make half the horsepower of their engine capacity.

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    Quote Originally Posted by ammarzahid View Post
    harley and royal enfield engines date back to the 60s. they aren't good engines they make half the horsepower of their engine capacity.
    that's the same case with every cruiser when compared to sports bike.
    It's because their torque top out at very low RPMs unlike sports bikes where you have to go at 15000 RPM to get the max torque
    Both have their own merits and demerits.

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    Quote Originally Posted by ammarzahid View Post
    OHV engines are old now, they're also called push rod engines and you cant find any OHV engine in modern cars or bikes. The reason they're used in the CG is they're extremely simple engines with low maintenance. No timing chains, valve controls everything. but they're not performance oriented, they're not high revving, that is their power falls off once they start reaching higher revs. OHC engines are better performing engines and modern OHCs are just as reliable. But they're slightly complicated for our jahil mechanics. In fact on OHV engines you'll have to change oil more frequently as compared to an OHC engine. this is just my percieved knowledge and shudnt be taken as the final word
    i find my 125 performing better at higher rpms and it is even better when it gets hot !!!
    the race is on

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    OHV engines are obsolete and donot provide better valve timing as compared to SOHC or DOHC ones...

    Provided that OHC and OHVs are made of equal quality an OHC shall require less maintinence and would prove more reliable and powerful. CG uses a good quality OHV which has potential to out perform poorly made OHCs by competitors. (Please note that those OHCs are also 70s-80s tec mostly) Otherwise nothing is better in OHVs or CG's engine.

    OHVs consume more fuel, vibrate more, have poorer valve timings, have lower topspeeds.

    OHVs have no timing chain instead they have push rods. OHVs also dont easily support multiple valves per cylinder.
    OHCs also mainly support only 2 but DOHC can support more. Likewise VVTI (Variable valve timing interllegence) or VTEC (Variable valve timing and lift electronic control)engines by Toyota and Honda are advanced versions of DOHC with further improved and precise valve timing for better acceleration and high end speed.

    Although there are also many modern day examples of OHVs, mainly in american cars that rely on more brute force than refinement... eg: dodge viper, dodge ram etc.

    OHVOHC engines VS OHV engines? -1301928

    OHCOHC engines VS OHV engines? -1301930

    DOHCOHC engines VS OHV engines? -1301927

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    Quote Originally Posted by RAGERACE View Post
    i find my 125 performing better at higher rpms and it is even better when it gets hot !!!
    Really strange.... I have noticed that in winter season bike make less noises as compared to summer.... I am not mechanical student but I think heat difference between system and environment matters alot.

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    Quote Originally Posted by Automotorsport_Lover View Post
    OHV engines are obsolete and donot provide better valve timing as compared to SOHC or DOHC ones...

    Provided that OHC and OHVs are made of equal quality an OHC shall require less maintinence and would prove more reliable and powerful. CG uses a good quality OHV which has potential to out perform poorly made OHCs by competitors. (Please note that those OHCs are also 70s-80s tec mostly) Otherwise nothing is better in OHVs or CG's engine.

    OHVs consume more fuel, vibrate more, have poorer valve timings, have lower topspeeds.

    OHVs have no timing chain instead they have push rods. OHVs also dont easily support multiple valves per cylinder.
    OHCs also mainly support only 2 but DOHC can support more. Likewise VVTI (Variable valve timing interllegence) or VTEC (Variable valve timing and lift electronic control)engines by Toyota and Honda are advanced versions of DOHC with further improved and precise valve timing for better acceleration and high end speed.

    Although there are also many modern day examples of OHVs, mainly in american cars that rely on more brute force than refinement... eg: dodge viper, dodge ram etc.

    OHVOHC engines VS OHV engines? -1301928

    OHCOHC engines VS OHV engines? -1301930

    DOHCOHC engines VS OHV engines? -1301927
    Thanks alot...

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    Quote Originally Posted by Motorheat View Post
    Really strange.... I have noticed that in winter season bike make less noises as compared to summer.... I am not mechanical student but I think heat difference between system and environment matters alot.
    It does.
    In winter engine oil doesn't get to as hot temperatures as in summer so result is oil in comparatively thicker state and silent engine.

    the thinner the oil goes, the louder the engine becomes.
    Try Zic 4T 10W-40 in a bike and then switch to Kixx 20W-50, you'll be amazed to notice how much oil can affect engine sound.

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    Great post by Automotosport brother people say OHC are latest no they are not latest
    they are also old engines but they are the winner and that is why manufactures are doing
    changes in them and improving their technology which Automotorsport brother has explained
    OHV can not handle what an OHC engine can do so simply OHV is an obsolete engine
    OHC is the way to go for unfortunately we are not here getting the latest OHC engines


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    salam... i wanna ask one thing ... kon sa engine zyada smooth hota hai... OHC or OHV kis engine ke noise kam hote hai .in 125 category.??tnx

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    Quote Originally Posted by Eur0_2 View Post
    salam... i wanna ask one thing ... kon sa engine zyada smooth hota hai... OHC or OHV kis engine ke noise kam hote hai .in 125 category.??tnx
    OHC = Less or no vibration at top speed / smooth / silent

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    Quote Originally Posted by fatal1ty View Post
    OHC = Less or no vibration at top speed / smooth / silent
    thanks ..can u please clarify it for me .y OHV engines produce noise

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    OHVs are not noisy nor do they vibrate if engineered properly... dont refer to CG125 becuase its a ride from 70s~80s and yes it lacks lot of improvements which may be incorporated.

    beside they are more forgiving then there OHC cousins and best suited for 3rd world countries where people dont really bother about maintaince ...



    Quote Originally Posted by Eur0_2 View Post
    thanks ..can u please clarify it for me .y OHV engines produce noise
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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