vitos 3mm crank

Discussion in 'Engine' started by blaster1990, Mar 8, 2008.

  1. blaster1990

    blaster1990 New Member

    Joined:
    Feb 8, 2008
    Messages:
    134
    Likes Received:
    0
    Trophy Points:
    0
    what does this actually do
    does it add more hp
    and if it does how much
  2. hickskateboarder

    hickskateboarder Member

    Joined:
    Mar 29, 2007
    Messages:
    1,008
    Likes Received:
    8
    Trophy Points:
    38
    Location:
    pennsylvania
    search. so much is on this forum about stroker cranks.
  3. pittboss45

    pittboss45 New Member

    Joined:
    Oct 2, 2007
    Messages:
    854
    Likes Received:
    9
    Trophy Points:
    0
    It will add torque and hp. We sell them for around $220 it think.

    If you planning to abuse the engine go with something other than the Vito crank.
  4. bkg479

    bkg479 New Member

    Joined:
    Mar 2, 2008
    Messages:
    260
    Likes Received:
    0
    Trophy Points:
    0
    you can pick one up from ebay for 150ish, they say it adds 4hp, I don't think it is quite that much, but definitely better throttle response.
  5. crusty4365

    crusty4365 New Member

    Joined:
    Sep 2, 2007
    Messages:
    621
    Likes Received:
    3
    Trophy Points:
    0
    Occupation:
    pizza boy/ deli nigger
    Location:
    montgomery NY
    CAUTION THERES A sh*tLOAD OF MATH AHEAD!


    yes indeed it does add more horsepower but not 4hp like the manufacturer tells you. i will break it down for you. the stock crank is 57mm a +3mm crank makes ur crank 60mm



    LETS DO SOME MATH!


    ok heres how it goes
    66mm bore converted to inches = 2.598 inches
    57mm crank converted to inches = 2.244 inches

    heres the formula (in inches to Cubic centimetes)


    borexstroke=displacement

    2.598 inches x 2.244 inches = 11.8957280573236 cubic inches

    convert that to cubic centimeters
    1 cubic inch = 16.387064 cubic centimeters

    apply that formula to the above product (11.8957280573236)

    1 cubic inch x 16.387064 = 16.387064 cubic centimeters
    11.8957280573236 cubic inches x 16.387064 = 194.9360381379971 cubic centimeters

    do your rounding...
    194.9360381379971 ͌ 195cc

    round 195cc and you get a stock yamaha blaster 200! (blaster 195 doesnt sound catchy lol so they rounded 195 up to 200 and also so it fits into the 200cc class)

    now thats stock and that 195cc puts out ͌ 20hp

    round 195cc to 200cc as yamaha did
    now divide 200cc by 20hp
    200cc / 20hp = 10cc
    thats ͌ 1hp every 10cc
    so the displacement to power ratio is 10:1

    ok so now lets do that equasion with a 60mm crankshaft rather than a 57mm

    convert that to inches
    60mm crank shaft = 2.364 inch crank shaft
    now the bore size is constant so we can leave that the same as before.

    bore x stroke = cubic inches
    2.598 inches x 2.364 inches = 12.531863247554806 cubic inches

    convert the 12.531863247554806 cubic inches to cubic centimeters by applying the formula i have provided above in blue.


    12.531863247554806 x 16.387064 = 205.360445076928449429584 cubic centimeters

    once again do your rounding

    205.360445076928449429584 = 205cc

    displacement to hp ratio is 10:1
    so with +10cc you get aproximatly 1hp more from that crank.

    in combination with a bored cylinder and a big bore kit and a milled head there is no ending to how much horse power you can put into this thing.

    posibilities are endless, so is math.

    but if you look at the whole picture 20hp is awfuly low, yet keeps you satisfied, now 21hp will make it that much more satisfying!


    please correct me if i am wrong with any of my calculations after all i did not use a calculator!=))



    i hope i helped




    cmon guys throw me sum rep this math took me an hour and a half to do!I:I
  6. Mootsman

    Mootsman New Member

    Joined:
    Dec 30, 2007
    Messages:
    98
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    Architect
    Location:
    Memphis, TN
    Since when does a stock blaster produce 20 hp?
  7. suprex

    suprex New Member

    Joined:
    Dec 3, 2007
    Messages:
    370
    Likes Received:
    1
    Trophy Points:
    18
    Occupation:
    journeyman electrician
    Location:
    Nashville, TN
    ya... 16hp is stock.
  8. authority454

    authority454 Guest

    i don't mean to correct you, but i was looking at that, and it didnt make sense. "2.598 inches x 2.244 inches = 11.8957280573236 cubic inches" inch x inch = inch squared not cubed. so i thought about it, and if bore times stroke equals displacement, then bore would have to mean cross section. in that case, stock bore, 66mm would be 6.6 cm. then area of that, which would be a circle is pi x 3.3 x 3.3 (radius squared) x 5.7 (stock stroke in cm.) and that equals 195.008 CCs. with a +3mm stoker then, it would be pi x 3.3 x 3.3 x 6.0 which equals 205.272 CCs.

    if 195 CCs produce 16 hp, which is stock then 205 CCs should produce 16.8 hp. rounded up it's 17, or +1.

    again, i didn't mean to correct you, but in that one equation, there was a missing inch and i stared at it until it drove me nuts and i had to find it. all the numbers match up though. im surprised that a stroker only adds 1 hp.
  9. BaBarossa

    BaBarossa New Member

    Joined:
    Aug 12, 2007
    Messages:
    90
    Likes Received:
    1
    Trophy Points:
    0
    Occupation:
    Electical Discharge Machining (EDM), Toolmaker
    Location:
    Germany, near Ulm
    I'll get my +3mm Vito's crank this week and built it in my Dt200R Motor with my 68mm Woessner piston, so I'll reach 218 ccm. I'll tell you the rear wheel power during the next few weeksI:I.
  10. wolf1

    wolf1 New Member

    Joined:
    Jan 19, 2008
    Messages:
    268
    Likes Received:
    3
    Trophy Points:
    0
    Occupation:
    Wolf Performance atv and dirtbike repair and mods
    Location:
    Ringgold Georgia
    be prepared to trench the case so the rod pin will pass.

    and you may need to cut out the cyilinder skirt as well on some +3 or +4 cranks.
    although vito's only offers as high as +3

    hot rods offers a +4
  11. blasterboy91

    blasterboy91 New Member

    Joined:
    Feb 19, 2008
    Messages:
    2,258
    Likes Received:
    7
    Trophy Points:
    0
    Occupation:
    maxin and relaxin
    Location:
    ARIZONA
    no crusty4365 is right.its about 20 cuz i have seen plenty of stock dyno test and they all say about 20hp
  12. flyers42091

    flyers42091 New Member

    Joined:
    Aug 24, 2007
    Messages:
    1,382
    Likes Received:
    5
    Trophy Points:
    0
    Occupation:
    Reinheart Order Selector
    Location:
    vermont
    Yamaha claims they only make 16 to the wheels, but ive never seen a dyno for one so i duno.
  13. crusty4365

    crusty4365 New Member

    Joined:
    Sep 2, 2007
    Messages:
    621
    Likes Received:
    3
    Trophy Points:
    0
    Occupation:
    pizza boy/ deli nigger
    Location:
    montgomery NY
    sorry if my math was off a little.... buttttt i doo beleive that its 18? to 20? hp stock, but hey you get the point none the less the +3 stroker should add about 1hp and 10cc.

Share This Page