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post #1 of (permalink) Old 05-24-2000, 09:52 AM
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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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post #3 of (permalink) Old 05-24-2000, 07:03 PM
Pete
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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.

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post #4 of (permalink) Old 05-25-2000, 12:10 PM
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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
post #5 of (permalink) Old 05-25-2000, 02:33 PM
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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...



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post #6 of (permalink) Old 05-25-2000, 08:16 PM
Pete
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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.

post #7 of (permalink) Old 05-26-2000, 09:19 AM
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Re: What is the Formula for CC\'s

Well then I guess I stand corrected.

AirBorn!!

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