This is a discussion on How do I calculate CC's ? within the Yamaha YFM660R Raptor (20012005) forums, part of the Performance /Technical category; What is the formula for figuring out my displacement? My motor is bored out .020 over in case anyone already knows....


LinkBack  Thread Tools  Display Modes 
12062001, 08:54 PM  #4 
Senior Member

Quote:
On 20011205 22:04, ultim8warrior wrote:
What is the formula for figuring out my displacement? My motor is bored out .020 over in case anyone already knows. B = BORE cm S = STROKE cm N = NUMBER OF CYLINDERS 
12072001, 01:47 AM  #5 
Senior Member

cc's stands for cubic centimeters, couldnt you just fill it with water then peasure how much water? I dont think its a great idea to fill you engine with water thoe, maby use gas.
__________________
`95 honda 400cc 4x4 `06 tw200 `86 bw200 Loud pipes close trails. 
12072001, 02:12 AM  #6 
Senior Member

hmm, interesting formula, but its unique, thats why I use logic, and it always works, thats why I say:
 *pi(r)^2* <formula for area of a circle times stroke, will give you area of the cylinder, times number of cylinders of course. Its easy to remember, so you never have to look it up! Just remember the area of a circle and your fine! 
12072001, 05:22 PM  #7 
Senior Member

Quote:
 *pi(r)^2* <formula for area of a circle
r = 1/2 bore pi = 4 x .7854 We know the bore and stroke, so we don't need to measure the radius. Remove the logic and it's Engine cc's for Dummies. ;) 
12072001, 11:40 PM  #8 
Senior Member

I tried badercarma's suggestion and I almost got smashed by my own 4wheeler. HOLY CRAP that thing was hard to flip over to get the water out back out.
__________________
92 warrior, Wiseco +.040, ALBA pipe, K&N, 36MM round slide carb,Ti valve springs, Maier plastic, 14 tooth sprocket, Bandits, Douglas .190's, Fly alum. bars, DG bumpers and nerf bars,oil cooler by Mascman 04 KFX 400 
12082001, 01:31 AM  #9 
Senior Member

They actually do that suggestion in some sancioning bodies of drag racing to confirm that you have the displacement you say you do. You dont turn the quad over of course, you just leave the plug out and crank it over... I'm not sure what they use to fill it with, though.

02112002, 05:05 PM  #11 
Member

another "less scientific way" is to take the number of lugnuts on your bike divided by the number of links on your chain. mltipy this by the length of your swingarm and then add to the combined number of inches of travel your front shocks offer. subtract this number from your date of birth and add your current age. you now have your answer. wasn't that easy??!! :)20 :)20 :)20 :)20 :)20 :)20 thanks for the info there. obviously, yours is more informative than mine.

02112002, 07:02 PM  #12 
Primo Member

pi * radius^2 * bore
All the measurements must be in CM if you want CCs a raptor is 100mm bore and 84mm stroke so change it to cm:10cm bore and 8.4 cm stroke radius = 1/2 the bore, or 5 cm 3.1415 * 5^2 * 8.4= 3.1415 * 25 * 8.4 = 659.715cc Now .020" over = 0.5080mm so the equation is: 100.508mm bore 84mm stroke convert to cm 10.0508cm bore 8.4cm stroke plug into the above formula 3.1415 * 5.0254^2 * 8.4= 3.1415 * 25.255 * 8.4 = 666.444 So on a raptor the displacement change is 666.444  659.715 = 6.729ccs larger that's just a little over 1% larger than stock.. damn.. and I just noticed you have a warrior.. not raptor 83 bore x 64.5mm stroke same numbers apply 348.97 cc stock 353.26 bored .020 over difference of 4.29ccs <font size=1>[ This Message was edited by: RaptorBrad2 on 20020211 18:05 ]</font> 
02122002, 11:40 AM  #14 
Senior Member

pi*(r*r)*stroke divide by 1000, r is the radius of your piston
__________________
Raptor 660R (686cc) w trinityport, 102mm high comp piston, webcam race profile can w/valve springs, Big Gun exhaust,proflow k&n no lid, durablue eliminator, full skids, beadlock & racing rims GYTR grafix, ELKA suspension, you name it it's on there 
Search tags for this page 
how to compute motorcycle cc,yamaha quad 2400cm what size is it in cc,how to determine cc of an rhino engine,yamaha raptor 2005 how to find out ccs,how to calculate what size my yamaha warrior atv is?,how to compute cc motorcycle,formula for figuring out bored over,atv cc size is 400 bored .30 over,how many cc is a 2005 banshee,what cc would my yamaha banshee be after boring the cylinders 20 over,how can i tell how many cc my yamaha fourwheeler is,how to figure the bore of a kawasaki triple
Click on a term to search our sites for related topics.

Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Legal cc's for racing  johnnymaddog  Yamaha YFZ450/450R (2004Present)  7  08112004 08:55 AM 
bore>cc's  YamahaWarrior_350  Yamaha YFM350 Raptor/Warrior ('87Present)  16  04072004 09:10 AM 
cc's  bigair450  Yamaha YFZ450/450R (2004Present)  3  03272004 06:23 AM 
Will Yamaha up the cc's on the Yfz?  5150HARVEE  Yamaha YFZ450/450R (2004Present)  20  02072004 10:03 PM 
how to get more cc's on warrior...  warrior90  Yamaha YFM350 Raptor/Warrior ('87Present)  3  01162002 05:00 PM 