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Discussion Starter · #1 ·
If you have ever wondered how many CC's you have, HERE YOU GO!! i am really bored tonight and figured all of these out myself.



BORE x BORE x .7854 x STROKE = CC's



BORE & STROKE = DISPLACEMENT

39mm BORE & 41.4mm STROKE = 49cc

47mm BORE & 41.4mm STROKE = 72cc

48mm BORE & 41.4mm STROKE = 75cc

50mm BORE & 41.4mm STROKE = 81cc

51mm BORE & 41.4mm STROKE = 85cc

52mm BORE & 41.4mm STROKE = 88cc

54mm BORE & 41.4mm STROKE = 95cc

56mm BORE & 41.4mm STROKE = 102cc



39mm BORE & 49.5mm STROKE = 59cc

47mm BORE & 49.5mm STROKE = 86cc

48mm BORE & 49.5mm STROKE = 90cc

50mm BORE & 49.5mm STROKE = 97cc

51mm BORE & 49.5mm STROKE = 101cc

52mm BORE & 49.5mm STROKE = 105cc

54mm BORE & 49.5mm STROKE = 113cc

56mm BORE & 49.5mm STROKE = 122cc



39mm BORE & 51mm STROKE = 61cc

47mm BORE & 51mm STROKE = 88cc

48mm BORE & 51mm STROKE = 92cc

50mm BORE & 51mm STROKE = 100cc

51mm BORE & 51mm STROKE = 104cc

52mm BORE & 51mm STROKE = 108cc

54mm BORE & 51mm STROKE = 117cc

56mm BORE & 51mm STROKE = 126cc



39mm BORE & 52mm STROKE = 62cc

47mm BORE & 52mm STROKE = 90cc

48mm BORE & 52mm STROKE = 94cc

50mm BORE & 52mm STROKE = 102cc

51mm BORE & 52mm STROKE = 106cc

52mm BORE & 52mm STROKE = 110cc

54mm BORE & 52mm STROKE = 119cc

56mm BORE & 52mm STROKE = 128cc



39mm BORE & 54mm STROKE = 65cc

47mm BORE & 54mm STROKE = 94cc

48mm BORE & 54mm STROKE = 98cc

50mm BORE & 54mm STROKE = 106cc

51mm BORE & 54mm STROKE = 110cc

52mm BORE & 54mm STROKE = 115cc

54mm BORE & 54mm STROKE = 124cc

56mm BORE & 54mm STROKE = 133cc



39mm BORE & 56mm STROKE = 67cc

47mm BORE & 56mm STROKE = 97cc

48mm BORE & 56mm STROKE = 101cc

50mm BORE & 56mm STROKE = 110cc

51mm BORE & 56mm STROKE = 114cc

52mm BORE & 56mm STROKE = 119cc

54mm BORE & 56mm STROKE = 128cc

56mm BORE & 56mm STROKE = 138cc







I think that this should also be made a Sticky so that people can find it in the future without having to search.









EDIT: decided to redo the signs since people were having trouble reading it.
 

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wtf???



well when i add up 52mm and 54mm....i get 106cc



you might wanna correct your formula



so the whole

BORE + STROKE = CC's

is a completely wrong formula.



39 + 41.4 = 50?? i think your confusing more people than your helping.
 

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its not bore plus stroke = cc's, hes just saying if you put a 52 crank plus a 54 piston together it would equal 115cc's. There is a formula to it.



to find it it is BORE X BORE X .7854 X STROKE
 
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The volume of a cylinder is actually pie x (r)squared x (h). That would be 3.14 x half the bore x half the bore x stroke. Thats just the "mathmatical formula". Both ways work and come up with the same number (within reason).
 

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z88R said:
[quote name='mxracer728']its not bore plus stroke = cc's, hes just saying if you put a 52 crank plus a 54 piston together it would equal 115cc's. There is a formula to it.



to find it it is BORE X BORE X .7854 X STROKE


52 crank

54 bore

119cc's[/quote]o,ok. I didn't do the math, just looked at Pimpinracers math so I put that. looks like his math is a little wrong
 

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Discussion Starter · #9 ·
my math is fine, u read it wrong.
 

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I posted this Howto back on 02-05-04 under aftermarket upgrades. (a little late and a few dollars short)..........?







Much Later.................OLDSCHOOL
 

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yea well when you put in math signs and an equal it kinda throws people off.......it would have been much more helpful for people to understand if you included the actual formula like OLDSCHOOL did in his post. some people will actually look at what you put and then go add the size of their bore and stroke and think that is really their cc's.



all im sayin is that this needs to be edited with the formula added in...........that way people dont get the wrong idea. to say "BORE + STROKE = CC's" is horribly wrong.



"my math is fine, you read it wrong"

i read it as would anyone else. might wanna check your math.......its right there....."BORE + STROKE = CC's

39mm + 41.4mm = 49cc". the + sign and the = sign make it look like thats the formula you use to get cc's. not to mention its the heading to the table.
 

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Discussion Starter · #14 ·
can also do it by:



BORE x BORE x 0.7854 x STROKE



SOOOOO.........FOR AN 88cc BIKE

(convert millimeters to centimeters)



5.2 x 5.2 x 0.7854 x 4.14=

------------------------------

88





p.s. its actually 87.922074 which rounds up to 88.
 

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Discussion Starter · #17 ·
CHANGED SOME OF THE STUFF UP AND AM GONNA BRING IT BACK TO THE TOP FOR NEW MEMBERS THAN MIGHT BE CURIOUS AS TO EXACTLY WHAT THEY HAVE OR POSSIBLE COMBINATIONS.....
 

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Discussion Starter · #18 ·
oops sry bout the caps
 
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