Powerplus or Bust, Eh?

Discussion in 'Old's Cool' started by Twotaildog, Jul 26, 2014.

  1. 1911fan

    1911fan Master of the Obvious

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    Nice work. There's probably a small but lucrative market for them.


    1911fan
  2. Jim K in PA

    Jim K in PA Long timer

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    I look at that design, and I can see an application for roller followers . . . :D

    Heck, with the low spring pressures, you could probably use delrin for rubbing block surfaces.

    Thanks for sharing, Kevin.
  3. Twotaildog

    Twotaildog Old Poop

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    The thought crossed my mind.




    Kevin


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  4. Twotaildog

    Twotaildog Old Poop

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    I measured the compression ratio. Here's a video.



    Let me know what you think.




    Kevin


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  5. fullmetalscooter

    fullmetalscooter Let me take this duck off

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    about all I can add to that is e quals mc squared which is my way of say Wow very cool you can figgar it all out
  6. Mr. Vintage

    Mr. Vintage Family Dude

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    Th math all seems legit to me - nice work. Was the low compression ratio a function of lousy fuel technology, or the mechanical limitations of the time?
  7. Twotaildog

    Twotaildog Old Poop

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    Yes. They were limited by the fuel, and the physical limitations of the side-valve configuration. With a side valve engine you have that large valve pocket that is always going to result in a large unswept volume.




    Kevin


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  8. Twotaildog

    Twotaildog Old Poop

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    Here's what was going on in my shop last night.








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    After three prototypes of the Intake cam followers and two prototypes of the Intake lift levers, the design is now set. I have managed to improve the valve open duration by 86 degrees and the valve lift by .109 inches. We will proceed with making a set out of D2 tool steel to run in the engine.




    Kevin


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  9. 1911fan

    1911fan Master of the Obvious

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    Very nice!


    1911fan
  10. OLD GREEN

    OLD GREEN Long timer

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    Well done Kevin, I bet you can't wait to road test it and see how she does.
  11. cyclefreak13

    cyclefreak13 Been here awhile

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    Hey Kevin why not just case harden the prototype followers and lift levers?
  12. Twotaildog

    Twotaildog Old Poop

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    D2 is more wear resistant.




    Kevin


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  13. Jim K in PA

    Jim K in PA Long timer

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    Is the lift equal front:rear? Front looks like less stroke at the pushrod but it may be an optical delusion on my part.
  14. Twotaildog

    Twotaildog Old Poop

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    Yes, they are the same. I measured them both with a dial indicator. It must be a camera angle thing. I saw it too. Or it's possible that the one is not returning all the way, with no spring to push it down. But the lift is .220 on both. That's up from .111 with my old parts.



    Kevin


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  15. Jim K in PA

    Jim K in PA Long timer

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    It's gonna be a fire spittin' monsta!
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  16. shupe

    shupe Been here awhile

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    Also there has to be room for the gas to flow from the valve pocket to the cylinder (the cavity in the "head").
    If you make that too small, you get more compression, but less flow. Too big = good flow but low compression.
    The Harley racing KR, with a lot of experimentation over the years, ended up around 6.5 to 1, I think, and made over 1 bhp per cubic inch (50-55 bhp from 45 cubic inches). The race bikes could run cheap pump gas.
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  17. Twotaildog

    Twotaildog Old Poop

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    Even more than it was!

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  18. Twotaildog

    Twotaildog Old Poop

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    KR's are cool.




    Kevin


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  19. Twotaildog

    Twotaildog Old Poop

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    It was a motor out kind of day. Patience is looking more and more like a bicycle every day.

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    Kevin


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  20. fullmetalscooter

    fullmetalscooter Let me take this duck off

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    Who knows if one guy can make an 1920 something Indian into world speed record holder you might do that same. After the cannon ball maybe the race of gentlemen ?
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