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#1
 
 
What is the Formula for CC\'s
Does anyone know the Formula to calculate cc's of a motor? I got the formula to calculate CID 3.1415 x (borex2) x stroke x # of cylenders. Don't know how to convert Cubic Inch to Cubic Centemeters either. I am trying to figure the exact CC's of my banshee which is bored over 1.75mm the stock bore is 64.0 mm and stock stroke is 54.0 mm woodsracer 99 cross country banshee 99 dodge quad cab 4x4 
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#2
 
 
Re: What is the Formula for CC\'s
Woods, I found the best page for this, it allows ya to figure out displacment and compression. Here is the hyperlink, http://ask.com/main/metaAnswer.asp?MetaEngine=AltaVista&logQID=03305C8 79631D411831600A0C9FC3DED&qCategory=movy&qSource=0 &frames=yes&site_name=Jeeves&scope=web&r=x&MetaTop ic=Calculating Cubic Centimeters & Compression Ratio&MetaURL=http://www.ben.esu6.k12.ne.us/sblock/ccfrm.html&EngineOrdinal=2&ItemOrdinal=1&ask=How to calculate Cubic Centimeters metasearch&origin=0&MetaList=http://www.ben.esu6.k12.ne.us/sblock/ccfrm.html&x=17&y=8 Just put in your information and it gives you the answers. 
#3
 
 
Re: What is the Formula for CC\'s
The formula I use is Bore squared times .7854 times stroke times # of cylinders. As for conversion, 1cu inch=16.387cc, 1cc=.06102 cu inch. 
 

#4
 
 
Re: What is the Formula for CC\'s
dude I used your formula and it dont calculate to anything close to what I have I have 366.63 cc's on a banshee but, I want the formula to fugure this out myself for example my measurements and your formula are as fallows Bore squared x .7854 x stroke x # of cylenders 65.75x2 = 131.5 x .7854 x 54.00 x 2 = 11154.2508 did I do the formula wronge or what??? woodsracer 99 cross country banshee 99 dodge quad cab 4x4 
#5
 
 
Re: What is the Formula for CC\'s
OK, here is how this works... Bore squared x .7854 x stroke x # of cylinders (65.75*65.75)*0.7854*54.00*2=366695.98 (4323.0625)*54.00*2= (233445.37)*2= 366695.98 However, this is not completely accurate because you will need to know ur head volume. I am assuming the .7854 is the average head volume, but will not give accurate numbers... 
#6
 
 
Re: What is the Formula for CC\'s
Airborn, Head volume is not used in calculation of displacement, only for compression ratio. The actual formula for area of a circle is pi R squared (3.14 x radius squared). I use the equivalent formula bore squared x .7854 so I don't have to divide bore by 2 to get the radius. Either of the above formulas will give you the cross sectional area of the cylinder. Then multiply by stroke x # of cylinders to get displacement. Then for compression ratio, use the formula (displacement head volume)/head volume. 
#7
 
 
Re: What is the Formula for CC\'s
Well then I guess I stand corrected. AirBorn!! 
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