Since '02 xBhp is different things to different people. From a close knit national community of bikers to India's only motorcycling lifestyle magazine and a place to make like-minded biker friends. Join us

#xBhpAxorHelmet #2

Axor
Castrol Power 1

Learn & practice evasive maneuvers.

Our Partners

User Tag List

Page 1 of 6 12345 ... LastLast
Results 1 to 10 of 52
Like Tree14Likes

Thread: Difference between "Inline Twin" and "Parallel Twin"?

  1. #1
    Rusted aargee's Avatar
    Join Date
    Jan 2010
    Location
    KATN
    Posts
    10,271
    Mentioned
    159 Post(s)
    Tagged
    4 Thread(s)

    Default Difference between "Inline Twin" and "Parallel Twin"?

    Gives me an immense pleasure sharing my knowledge that a fellow XBHPian taught me when I was new in this forum

    Take an example of two cylinder engine; A parallel engine goes firing for every 360 degree rotation, while an inline goes firing for every 180 degrees.

    Means, on an inline engine, when one piston goes up, the other comes down. But in the case of parallel, both goes up & down together.

    Additional information - Straight-two engine - Wikipedia, the free encyclopedia

    Ninja 250R, Triumph Bonneville are some motorcycles running on parallel twin.
    Last edited by ken cool; 05-19-2010 at 07:25 PM.
    itsmevini123 and emm like this.
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

  2. #2
    Rusted niks_devil666's Avatar
    Join Date
    Oct 2006
    Location
    Local Area Network
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    If its just this diff (180 and 360 degree offset), then why don't they exist , or do they ?
    [SIGPIC][/SIGPIC]The Moto Cafe - India's first bike theme cafe @ Chandni Chowk

    The Moto Cafe video -
    http://www.youtube.com/watch?v=6XztkK4ej2U

    My Youtube channel

    http://www.youtube.com/user/niksdevil666

  3. #3
    Rusted ken cool's Avatar
    Join Date
    Sep 2005
    Location
    New Delhi
    Posts
    4,718
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by aargee View Post
    Take an example of two cylinder engine; A parallel engine goes firing for every 360 degree rotation, while an inline goes firing for every 180 degrees.

    Means, on an inline engine, when one piston goes up, the other comes down. But in the case of parallel, both goes up & down together.

    Additional information - Straight-two engine - Wikipedia, the free encyclopedia
    Thank you!
    The Wheel was a great invention; Two Wheels with a Motor in between was even better!


    BMW Motorrad Days 2011

    Xbhp's Indo-French Kashmir-Ladakh Tour

  4. #4
    Rusted aargee's Avatar
    Join Date
    Jan 2010
    Location
    KATN
    Posts
    10,271
    Mentioned
    159 Post(s)
    Tagged
    4 Thread(s)

    Default

    Quote Originally Posted by ken cool View Post
    Thank you!
    No problem Sir, pleasure is mine.

    Quote Originally Posted by niks_devil666 View Post
    If its just this diff (180 and 360 degree offset), then why don't they exist , or do they ?
    Are you asking if they (which one?) exist or do not exist? I didn't understand the point. Pls elaborate.
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

  5. #5
    Rusted
    Join Date
    Jan 2009
    Location
    Ahmedabad
    Posts
    429
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by niks_devil666 View Post
    If its just this diff (180 and 360 degree offset), then why don't they exist , or do they ?
    The major point why you will generally only find inline twin engines is that the dynamic balance of a inline twin is much better than a parallel twin. A parallel twin has a dynamic balance that is the same as a single cylinder engine as the pistons move up and down together. In an inline twin they move in opposite directions thus canceling out some of the second degree vibrations that a single cylinder (and a parallel twin) engine would have. An inline twin does have a sideways rocking vibration around its central axis, but that's a much less then any vibration from having your pistons move together.

  6. #6
    Rusted aargee's Avatar
    Join Date
    Jan 2010
    Location
    KATN
    Posts
    10,271
    Mentioned
    159 Post(s)
    Tagged
    4 Thread(s)

    Default

    Last weekend I was explaining this to one of our member & he felt asleep ; worst part being, I too felt sleep & the difference being that he was co-passenger while I was driving

    Anyway, that conversation left me with a question - Which one generates more torque? In my thoughts, its the parallel twin due to the double punch, but the top end or the maximum speed will be a limit. While an inline lacks the punch as much as a parallel twin but has a very good top end. Is this really true? Can someone help me understand the technicalities pls? Tks.

    I think we're completely off topic; Mods - requesting to create or merge with an existing thread. Thanks.
    Prashant Azazel likes this.
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

  7. #7
    Moderator Samarth 619's Avatar
    Join Date
    Sep 2008
    Location
    Rajasthan
    Posts
    4,916
    Blog Entries
    4
    Mentioned
    43 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by aargee View Post
    Last weekend I was explaining this to one of our member & he felt asleep ; worst part being, I too felt sleep & the difference being that he was co-passenger while I was driving

    Anyway, that conversation left me with a question - Which one generates more torque? In my thoughts, its the parallel twin due to the double punch, but the top end or the maximum speed will be a limit. While an inline lacks the punch as much as a parallel twin but has a very good top end. Is this really true? Can someone help me understand the technicalities pls? Tks.

    I think we're completely off topic; Mods - requesting to create or merge with an existing thread. Thanks.
    sorry for OT.

    Actually, it depends on cylinder firing orders too.
    In 4 stroke engines, every cylinder fires on 720 degrees of crankshaft turn.

    For multi cylinder engines, irregular or close pulses result in more low end torque or more sound, while evenly spaced firing pulses result in higher revving...

    Hence, for a modern parallel twin, it is possible to fire 360-360 degrees to high rev it, like Ninja 250 does, and so it produces more power too than a single cyldnr 250 does...
    ---
    Brotherhood, Rules, Freedom. Xbhp.
    Indian riding = Alertness, Anticipation and Adjustment.

  8. #8
    Rusted
    Join Date
    Jan 2009
    Location
    Ahmedabad
    Posts
    429
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Samarth 619 View Post
    sorry for OT.

    Actually, it depends on cylinder firing orders too.
    In 4 stroke engines, every cylinder fires on 720 degrees of crankshaft turn.

    For multi cylinder engines, irregular or close pulses result in more low end torque or more sound, while evenly spaced firing pulses result in higher revving...

    Hence, for a modern parallel twin, it is possible to fire 360-360 degrees to high rev it, like Ninja 250 does, and so it produces more power too than a single cyldnr 250 does...
    Actually, ninja uses a 180 deg crank throw for it's pistons, so they don't move together. Ninja has a typical inline twin engine which fires the cylinders right after each other. A parellel twin as you describe would not be able to rev as high, since the second order vibrations would shake the engine to bits.

  9. #9
    Rusted niks_devil666's Avatar
    Join Date
    Oct 2006
    Location
    Local Area Network
    Posts
    2,152
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    ^ so ninja is an inline twin but called as a parallel twin by the manufacturer?
    [SIGPIC][/SIGPIC]The Moto Cafe - India's first bike theme cafe @ Chandni Chowk

    The Moto Cafe video -
    http://www.youtube.com/watch?v=6XztkK4ej2U

    My Youtube channel

    http://www.youtube.com/user/niksdevil666

  10. #10
    Rusted aargee's Avatar
    Join Date
    Jan 2010
    Location
    KATN
    Posts
    10,271
    Mentioned
    159 Post(s)
    Tagged
    4 Thread(s)

    Default

    Quote Originally Posted by Andante View Post
    Actually, ninja uses a 180 deg crank throw for it's pistons, so they don't move together. Ninja has a typical inline twin engine which fires the cylinders right after each other. A parellel twin as you describe would not be able to rev as high, since the second order vibrations would shake the engine to bits.
    With due respects, glad if you can check this out - kawasaki ninja - Bajaj

    Quote Originally Posted by Samarth 619 View Post
    Actually, it depends on cylinder firing orders too.
    In 4 stroke engines, every cylinder fires on 720 degrees of crankshaft turn.
    Got you, learned something new today. Thanks.

    Quote Originally Posted by Samarth 619 View Post
    Hence, for a modern parallel twin, it is possible to fire 360-360 degrees to high rev it, like Ninja 250 does, and so it produces more power too than a single cyldnr 250 does...
    I couldn't understand this; could you elaborate pls?
    Skill is what keeps you on a Motorcycle
    Awareness + Skill is what keeps you out of harm's way
    ATGATT + Awareness + Skill means you might Live To Ride another day

Page 1 of 6 12345 ... LastLast

Similar Threads

  1. What is "Power", what is "Torque"..??
    By payeng in forum General Biking Discussion
    Replies: 102
    Last Post: 03-03-2016, 10:32 PM
  2. [Photo Feature]: Riding to the heart of the Hoysala empire"16th century "
    By Naughty VaIsH in forum The Tourer
    Replies: 21
    Last Post: 05-21-2010, 08:10 PM
  3. Hero Honda: "Your bike will start, even if its under 5 feet of water"
    By RedApple in forum General Biking Discussion
    Replies: 27
    Last Post: 03-28-2010, 07:12 PM
  4. Replies: 8
    Last Post: 04-14-2009, 12:39 AM
  5. Which is your Favourite/Trusted "Desi" Auto Publication & Journalist
    By payeng in forum General Biking Discussion
    Replies: 13
    Last Post: 02-10-2009, 06:59 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •