Welcome to VFRworld.com! Log in or Sign up to interact with the community.

V4 racing project

Discussion in 'Racing & Track Days' started by hondarv4, Nov 8, 2010.

  1. CandyRedRC46

    CandyRedRC46 Member

    Country:
    United States
    Joined:
    Feb 3, 2009
    Messages:
    3,503
    Likes Received:
    66
    Location:
    Orlando Florida
    damn thats some ridiculous compression. i hope you got a huge cam to combat any detonation.
    im thinking youre gonna need a lot more than 36 mm to let that thing breathe.
     


    This site may contain affiliate links for which VFRworld may be compensated
  2. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    Yes , I know, its all new territory, but someone has to go the way
     


    This site may contain affiliate links for which VFRworld may be compensated
  3. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    So why not put a propane motor on the list of things to do too?

    Ya know, Just to see if it works? Or make it into a turbo diesel?

    If you were going to build a drag bike, or a tractor pull engine, then the idea makes sense to me. Without more technical data on "why" there would be any benefit to such a thing on a track bike, then it sounds like you're pulling a leg.
     


    This site may contain affiliate links for which VFRworld may be compensated
  4. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    No , I'm not pulling anybody's leg, maybe my own , but never mind, the second engine is there , why not try?
     


    This site may contain affiliate links for which VFRworld may be compensated
  5. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    And I hate diesel....
     


    This site may contain affiliate links for which VFRworld may be compensated
  6. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    Because, unless you disagree, it will only change the torque curve and not overall horsepower. So it would seem there would be little benefit on a track bike. Unless you have a different opinion - I'm all ears. About all I know of racing is that I've seen it on TV once.

    Your current mod, you have a goal of 150hp. So it would seem there would be a reason or goal of doing a big bang besides "just because"

    It would seem the money would be better spent on a turbo.
     


    This site may contain affiliate links for which VFRworld may be compensated
  7. Tulok

    Tulok New Member

    Joined:
    Nov 8, 2008
    Messages:
    23
    Likes Received:
    0
    Maybe the same reason/because MotoGP bikes have been doing it for nearly 20 years!
    No doubt it would probably increase traction feel. I have heard of people flipping the front cam upside down on the VFR's to achieve what he is talking about, but it's hard to find more info about it.
     


    This site may contain affiliate links for which VFRworld may be compensated
  8. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    Just flipping cams and not doing anything with the crank bearing caps seems sketchy? You've now nearly doubled the downward force on the crank - even if it is on opposite ends of the crank?

    And you'd have to build a custom ignition box to change the timing since the timing signal comes off the end of the crank?
     


    This site may contain affiliate links for which VFRworld may be compensated
  9. Tulok

    Tulok New Member

    Joined:
    Nov 8, 2008
    Messages:
    23
    Likes Received:
    0
    that's what I thought too, but the info was vague.
    I remember something about a wasted spark or swapping a coil lead, it seemed to make sense I wish I could find out where I read it.
     


    This site may contain affiliate links for which VFRworld may be compensated
  10. Tulok

    Tulok New Member

    Joined:
    Nov 8, 2008
    Messages:
    23
    Likes Received:
    0
    It actually just makes the 1 and 3 cylinders swap firing orders, right?
     


    This site may contain affiliate links for which VFRworld may be compensated
  11. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    It is only a testing another concept, I don't think the crank will cause any problem that one is built to last. The plan is not to be activated until 2012 , so haven't been thinking to much about , only roughly.
     


    This site may contain affiliate links for which VFRworld may be compensated
  12. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    No turbo, no place for a intercooler, maybe racing with ethanol that gives est 20% boost on HP figures
     


    This site may contain affiliate links for which VFRworld may be compensated
  13. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    maybe you don't have to change anything with spark. There are some here who know a good bit about the VFR ignition. Now that I think about it, she fires at the top of each piston stroke regardless of whether it's on the compression stroke or not.
     


    This site may contain affiliate links for which VFRworld may be compensated
  14. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    ?? I thought ethanol had roughly 20% LESS stored energy than gasoline?
     


    This site may contain affiliate links for which VFRworld may be compensated
  15. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    I was told : " Racing Ethanol brings more power", I haven't studied the item, but if it boosts the power, sounds like a way, doesn't it?
     


    This site may contain affiliate links for which VFRworld may be compensated
  16. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

    Country:
    United States
    Joined:
    Oct 5, 2009
    Messages:
    7,831
    Likes Received:
    91
    Location:
    Colorado Front Range
    I know Nascar is switching to an ethanol blend this year to please the tree huggers. I haven't heard that there was any expected gains in HP but I haven't heard about any grumblings of HP losses either. ethanol blends for the average consumer have a reduction in stored energy.
     


    This site may contain affiliate links for which VFRworld may be compensated
  17. 02 VFR Rider

    02 VFR Rider New Member

    Joined:
    Jan 29, 2009
    Messages:
    2,286
    Likes Received:
    2
    big bang = big woody, if it works out you will make a killing on building more of these - I'll take 2 please
    I have more on this matter, but at work - more to follow.
     


    This site may contain affiliate links for which VFRworld may be compensated
  18. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    That I can believe
     


    This site may contain affiliate links for which VFRworld may be compensated
  19. hondarv4

    hondarv4 New Member

    Joined:
    Nov 7, 2010
    Messages:
    193
    Likes Received:
    0
    Location:
    Germany
    I was considering Webers, even
     


    This site may contain affiliate links for which VFRworld may be compensated
  20. Tulok

    Tulok New Member

    Joined:
    Nov 8, 2008
    Messages:
    23
    Likes Received:
    0
    Ethanol and Methanol carry ~1/2 the thermal energy of gasoline.
    The advantages are it's greater resistance to knock, pinging and predetonation. You would probably be better off mixing a 10-20% mixture with race fuel combined with high compression ratios (13+) and aggressive timing to see real horsepower gains.
    In turbo'd street cars in my area, it's fairly commmon to run ~10% methanol allowing you to raise your boost 2-5lbs without encountering predetonation.
     


    This site may contain affiliate links for which VFRworld may be compensated
Related Topics

Share This Page