close

Privacy guaranteed - Your email is not shared with anyone.

High RPM

Discussion in 'Yakima' started by Duck, Sep 20, 2012.


  1. Duck

    Duck
    Expand Collapse

    356
    1
    Trophy Points:
    218
    Location:
    Yakima, WA
    So a question for everyone: What is the highest revving motorcycle currently in production? And before some smart-ass comments about how RPMs don't equal power or speed, I don't really care and that's not the question.
     
  2. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
    My 06 r6 had a 17500 red line!

    And rpm absolutely equals hp. There are only two other numbers that are part of the formula and one is a constant.
     
    #2 fastfoodfred, Sep 20, 2012
    Last edited: Sep 20, 2012
  3. king_ogre

    king_ogre
    Expand Collapse

    496
    0
    Trophy Points:
    266
    Location:
    Or
    MTT Turbine SUPERBIKE

    Engine: Rolls Royce Allison, 250 series gas turbine
    Power: 320-HP @ 52,000-rpm, (286-HP @ rear wheel)
    Torque: 425-ft/lbs @ 2,000-rpm

    -R
     
  4. WaGigKPN

    WaGigKPN
    Expand Collapse

    2,054
    2
    Trophy Points:
    418
    Location:
    Gig Harbor, WA
    I Ride:
    2000 XR650R
    I imagine other bikes will max out around there as well. In order to get the 20k+ RPM you need to have pneumatic valve "springs" IE, valves are pushed back by compressed air, not springs. I heard F1 car engines before all the rules were made were getting engine rpm's of close to 30k! (have not fact checked that, i am sure you can google it)
     
  5. WaGigKPN

    WaGigKPN
    Expand Collapse

    2,054
    2
    Trophy Points:
    418
    Location:
    Gig Harbor, WA
    I Ride:
    2000 XR650R
    and the other being??? Displacement...

    I dont know the formula but i really doubt its just rpm displacement and a constant...There are so many other variables...right?
     
  6. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
    Hp=rpm x lb/ft / 5252

    That's it. Rpm times torque divided by 5252 equals hp.
     
  7. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
    If you can increase rpm without sacrificing torque too much, or increase torque, you will have more hp.
     
  8. WaGigKPN

    WaGigKPN
    Expand Collapse

    2,054
    2
    Trophy Points:
    418
    Location:
    Gig Harbor, WA
    I Ride:
    2000 XR650R
    Learn something new everyday...thanks.
     
  9. Reflexx

    Reflexx
    Expand Collapse

    435
    0
    Trophy Points:
    116
    Location:
    Vancouver,WA
    RPM will dictate HP only in the relationship of how fast you can generate RPM.
    If HP is how fast an engine will make power and torque is how much work it will do, this applies. The only constant is the torque and horsepower will always cross paths at a 5250 rpm and HP will continue to rise and torque will drop (I suppose there may be a few exceptions to this rule as this formula is specific to piston driven engines).

    From what I remember, Cosworth got an F1 engine to run a little over 20,000 RPM years ago but the issue was not mechanical but rater the inability to get any more air into the engine without forced induction. This means they have gotten air to travel at terminal velocity into the runners and it simply could not "pull" any more air in.
     
  10. Big T

    Big T
    Expand Collapse

    251
    0
    Trophy Points:
    216
    Location:
    Beaverton
    I believe the early Honda RC racers, like the RC149, revved to 20k back in 1966
     
    fastfoodfred likes this.
  11. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
    http://www.youtube.com/watch?v=eaRop_ZMwo0

    here is an RC166, 250 cc. I believe it rev'd over 21,000 rpm. the tach is marked at only 18k, but I am looking now for real info. the end of the video sends chills up my spine.

    edit*- I guess it's merely 18 grand.
     
    #11 fastfoodfred, Sep 20, 2012
    Last edited: Sep 20, 2012
  12. ericrayl

    ericrayl
    Expand Collapse

    50
    2
    Trophy Points:
    66
    Location:
    Woodinville, WA
    Uhhh, no. The formula is applicable to anything in rotary (as opposed to liner) motion.

    It is the rotary version of: (force x distance) / time = power
     
  13. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
    at 60 hp, this thing cranked out a whopping 17.5 lb/ft or ground pounding torque. its all about rpm! in other words, it could almost make a bolt finger tight.

    torque is what flips your feet out from under you when you bend your pecker into the toilet with morning wood
     
  14. DiveR-1

    DiveR-1
    Expand Collapse
    Mr. Pecs

    829
    0
    Trophy Points:
    566
    Location:
    Medford Oregon
    Those particular R6's actually redlined at 16,000 rpm. That redline was about 1500 RPM optimistic. here's the link to a roadracing world story from a few years back. http://www.roadracingworld.com/news/article/?article=25009
     
  15. rmorten

    rmorten
    Expand Collapse

    827
    0
    Trophy Points:
    216
    Location:
    Federal Way, WA
    Yes but with no RPMs... so no horsepower; only hosepower.
     
  16. nsrg500

    nsrg500
    Expand Collapse

    1,788
    0
    Trophy Points:
    416
    Location:
    Everett. WA
    That RC166 was a 6 cylinder 250cc's. Think about that for a second.
    If I remember right it was like 10mm bore and 9 or 10mm stroke.
    Oh yea, it was 4 valves per cylinder too. The valves looked like stick pins.
    If you take a 1/4" drive 8 or 9mm socket that's about the size of the piston.

    Yes rpm is everything. More RPM, more power strokes per minute.
    RPM has a lot to do with flame front travel. How long does it take for the charge to burn from one side of the piston to the other. The bigger the bore, the longer it takes. Bigger bore = heavier parts = slower revving.
    Tanker ships make huge amounts of power but only run at like 250-300 rpm with a 6' bore.
     
  17. Supersport_F

    Supersport_F
    Expand Collapse

    46
    0
    Trophy Points:
    166
    Location:
    Southwest WA
    I always loved the sound the RC166 made, just awesome. There isn't a idle circuit on the carbs for the RC166, probably why you will never hear one idle below 5,000 rpm. Fascinating.

    http://www.youtube.com/watch?v=vdDb7t2gCa0&feature=related

    The Honda NR500, although unsuceesful, it ran at 19,500 rpm in race tune for 81.

    http://www.motorcyclespecs.co.za/model/Classic Racers/honda_nr_500_gp_racer_1979.htm

    But the '66 RC116 was 21,500 rpm putting out 16hp with 50cc's. Pretty incredible.

    http://www.vf750fd.com/Joep_Kortekaas/1966.html#RC116
     
  18. fastfoodfred

    fastfoodfred
    Expand Collapse

    19,542
    0
    Trophy Points:
    2,518
    Location:
    spokane, wa
  19. 96SN95GT

    96SN95GT
    Expand Collapse

    4,674
    0
    Trophy Points:
    766
    Location:
    Arlington, Wa
    I believe the ZX2R revs to 20,000. Highest that I know if for a motorcycle.
     
  20. courier11sec

    courier11sec
    Expand Collapse

    10,892
    0
    Trophy Points:
    1,268
    Location:
    where they don't have lawns.
    Well maybe not quite that small, but...
    [​IMG]
    Just found this neat rc166 writeup.
    http://www.returnofthecaferacers.com/2011/02/sweet-sounding-honda-six.html
    Exact specs are apparently more than a quick google search away.
    Think about it though, 10mmx10mm x 6 cylinders won't get you to 249cc.
    I so want one of those bikes.
     
Loading...
Similar Threads Forum Date
High quality twistys Like Palomar Mountain in SO CAL? Portland Region May 11, 2016
Highway 7 run today? Tacoma-Puyallup May 1, 2016
Highway 7 run New Users Apr 30, 2016
Spidi 44/54 One piece super high end suit and 43/9 Sidi Vertigo Boots Gear, Parts, & Accessories Jan 10, 2016
I was wondering which one of you did this until I saw the 'high handlebars'. Portland Region Oct 23, 2015