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  1. Join Date
    May 2008
    Posts
    329
    #1
    i know na ang ideal for diesel engines ay undersquare to produce more torque, but i see some oversquare diesel engines as well,may advantage dn ba ito compared sa undersquare diesel engines?

  2. Join Date
    Feb 2009
    Posts
    5,010
    #2
    I think you have it backward. Over square has longer stroke than the piston diameter for higher torque due to a longer crank throw but is not suitable for higher sppeds

  3. Join Date
    Jul 2006
    Posts
    8,494
    #3
    For starters, here's a good read.

    Stroke ratio - Wikipedia, the free encyclopedia

  4. Join Date
    Aug 2004
    Posts
    22,710
    #4
    No, oversquare has bigger bore than stroke.

    Typically provide for more revs, but other factors affect this, also.

    Ang pagbalik ng comeback...

  5. Join Date
    Feb 2009
    Posts
    5,010
    #5
    Quote Originally Posted by niky View Post
    No, oversquare has bigger bore than stroke.

    Typically provide for more revs, but other factors affect this, also.
    Thanks, I stand corrected

  6. Join Date
    May 2008
    Posts
    329
    #6
    Quote Originally Posted by niky View Post
    No, oversquare has bigger bore than stroke.

    Typically provide for more revs, but other factors affect this, also.
    un dn ang sabi sa mga nabasa ko sa ibang forums and sabi dn nila na an oversquare engine produces more peak hp power at high revs compared to an undersquare engine is that true sir?

  7. Join Date
    Oct 2014
    Posts
    337
    #7
    Quote Originally Posted by HUMABOL KA View Post
    i know na ang ideal for diesel engines ay undersquare to produce more torque, but i see some oversquare diesel engines as well,may advantage dn ba ito compared sa undersquare diesel engines?

    Sir very technical na pu yung term nyu na UNDERSQUARE,OVER SQUARE for diesel engine ..

    xenxa na pu paki paliwanag pu ng mabuti para sa amin na d nakakaalam..TY

  8. Join Date
    May 2008
    Posts
    329
    #8
    Quote Originally Posted by JR318 View Post
    Sir very technical na pu yung term nyu na UNDERSQUARE,OVER SQUARE for diesel engine ..

    xenxa na pu paki paliwanag pu ng mabuti para sa amin na d nakakaalam..TY
    UNDERSQUARE= engine with a longer stroke but smaller bore
    OVERSQUARE= engine with a shorter stroke but bigger bore

  9. Join Date
    May 2008
    Posts
    329
    #9
    Quote Originally Posted by JR318 View Post
    Sir very technical na pu yung term nyu na UNDERSQUARE,OVER SQUARE for diesel engine ..

    xenxa na pu paki paliwanag pu ng mabuti para sa amin na d nakakaalam..TY
    Double post

  10. Join Date
    May 2009
    Posts
    1,990
    #10
    sa tingin ko e depende na iyan sa application. kung sa akin lamang e i would prefer undersquare than over. mas relaxed idrive ang undersquare lalo na sa hill climb with a heavy load.

    pero kung need for speed ka e oversquare.

    brader JR318, yung UNDERsquare e mas malaki dimension ng stroke kesa cylinder bore (diameter ng piston). ibig sabihin mas malaki ang buwelo ng piston during the power stroke.

    kung OVERsquare naman e mas mabilis nyang tapusin ang apat na stroke sa isang cycle ("mas mabilis ang ikot ng makina")

    may mga factors pa rin na makakaapekto sa bawat isa. kaso dudugo na ilong ko sa usapang iyon. hanggan jan na lang. hehe

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Oversquare turbo diesel engine V.S. Undersquare turbo diesel engine