Engine Drivetrain 1st Gen Cooper S Most liked posts in thread: GNAT - The Resurrection

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  1. Redbeard

    Redbeard JCW: because fast is fun!
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    #183 Redbeard, Mar 28, 2012
    Round cylinders. What a concept. LOL! I'm happy to hear they've got it all back in round.
     
  2. minimark

    minimark Well-Known Member

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    #184 minimark, Mar 28, 2012
    Sounds good, can't wait to see what ya have when it's all finished!!! :cool:
     
  3. goaljnky

    goaljnky New Member

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    #185 goaljnky, Mar 28, 2012
    entirely unrelated, but did anyone ever make oval cylinders?
     
  4. Metalman

    Metalman Well-Known Member
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    #186 Metalman, Mar 28, 2012
    Last edited by a moderator: Mar 28, 2012
    [​IMG]
     
  5. Nathan

    Nathan Founder

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    #187 Nathan, Mar 28, 2012
    Yes...

    VW developed a 2.3-liter 4-cylinder diesel engine with oval pistons (well, actually they're elliptical, not oval)

    [​IMG]

    Honda raced a bike with elliptical cylinders.

    [​IMG]

    Honda NR750, an outgrowth of the NR500 GP bike
     
  6. Minidave

    Minidave Well-Known Member
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    #188 Minidave, Mar 28, 2012
    I believe Metalman's pic is of the Honda piston, they ran 4 of those babies in the engine! Not only did it allow better breathing via 8 valves, but better cooling because of the increased surface area.....Here's what the engine looked like....

    [​IMG]

    and the insides....

    [​IMG]

    I wonder how you bore and machine those cylinders?
     
  7. goaljnky

    goaljnky New Member

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    #189 goaljnky, Mar 28, 2012
    Cool! So how come they don't use those in cars?
     
  8. ScottinBend

    ScottinBend Space Cowboy
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    #191 ScottinBend, Mar 28, 2012
    There were some WWII rotary airplane engines that had oval pistons.
     
  9. Jan

    Jan Well-Known Member
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    #192 Jan, Mar 28, 2012
    the reason is they are too hard to machine...........only the factory was capable of doing this at great cost no less
     
  10. Dave.0

    Dave.0 Helix & RMW Powered
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    #193 Dave.0, Mar 28, 2012
    Sorry everyone for pulling the thread away from the topic. Your right it was childish, and won't happen again.

    Nathan,

    The news and pictures look great and I can't wait to see it all done and running around Fontana and the Dragon.
     
  11. Minidave

    Minidave Well-Known Member
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    #194 Minidave, Mar 28, 2012
    Honda did this for their GP motorcycles - it's like Formula One, cost is simply not important......
     
  12. goaljnky

    goaljnky New Member

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    #195 goaljnky, Mar 28, 2012
    I see that happening back in the day. Would the new CNC machines of today not make that easier?
     
  13. Jan

    Jan Well-Known Member
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    #196 Jan, Mar 28, 2012
    I'm sure it would be easier than back in the day but the costs would be crazy for the average joe........rings are that much more difficult to get etc as everything is so out of the "norm"

    can it be done? sure..........would it be affordable? ..........NO
    just my .02

    they were bad mama jammers though
     
  14. Metalman

    Metalman Well-Known Member
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    #197 Metalman, Mar 29, 2012
    With those pistons the rings sure wouldn't have a chance to rotate around and become aligned. I can't imagine how they handled piston ring growth with heat expansion. I'll bet maintaining a good seal was a huge problem with that shape.
     
  15. Justa Jim

    Justa Jim Well-Known Member
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    #198 Justa Jim, Mar 29, 2012
    I could really run with a straight line like that MM..........but I won't. :D

    Jim
     
  16. Metalman

    Metalman Well-Known Member
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    #199 Metalman, Mar 29, 2012
    Last edited: Mar 29, 2012
    ...
     
  17. Justa Jim

    Justa Jim Well-Known Member
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    #200 Justa Jim, Mar 29, 2012
    You have to stop doing this MM. I can hardly keep my fingers from dancing across the key board. :D

    Jim
     
  18. Nathan

    Nathan Founder

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    #201 Nathan, Mar 29, 2012
    Can we stop the chatter here please and focus on the subject of the thread.

    It's making it very hard to keep up with the actual work being performed when one has to wade through pages of comments from the peanut gallery about stuff that is far from being on topic.
     
  19. Minidave

    Minidave Well-Known Member
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    #202 Minidave, Mar 29, 2012
    Are there further developments?

    Pics, please!
     
  20. Justa Jim

    Justa Jim Well-Known Member
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    #203 Justa Jim, Mar 29, 2012
    What color did you finely decide on for the block?

    Jim
     
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