How Many CC’s

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Lamaddict
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Mon Jan 22, 2018 1:00 am

Suzuki 185 (64mm) piston and a 115x60 crank. What would the CC’s be?

Darrell Taylor
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Mon Jan 22, 2018 1:37 am

a basic acu method of calculating cubic capacity is bore x bore x stroke x 0.785

so 64 x 64 x 60 x 0.785 = 192.92 cc
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garry inglis
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Mon Jan 22, 2018 6:25 am

We're does the 0.785 come from why not 1mm

Scooterdude
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Mon Jan 22, 2018 9:09 am

Use one of the on line calculators : 193cc

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Shaunbond
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Mon Jan 22, 2018 1:14 pm

garry inglis wrote:
Mon Jan 22, 2018 6:25 am
We're does the 0.785 come from why not 1mm
The first 3 figures only calculate the square capacity. The 78.5% is the percentage which converts it to a cylinder.
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garry inglis
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Mon Jan 22, 2018 2:44 pm

thanks shaunbond

Chris in Margate
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Tue Jan 23, 2018 8:57 am

0.785 has been used because it's Pi ÷ 4

Calculation for volume is PI x R x R x H

PI is 22/7. Divide by 4 instead of dividing the diameter of the piston by 2 twice.

Scooterdude
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Tue Jan 23, 2018 9:15 am

Bit beyond me all this pi stuff, but I like Darrell’s explanation which I have memorised for future reference.

eden
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Thu Jan 25, 2018 4:52 pm

Darrell Taylor wrote:
Mon Jan 22, 2018 1:37 am
a basic acu method of calculating cubic capacity is bore x bore x stroke x 0.785

so 64 x 64 x 60 x 0.785 = 192.92 cc
that's wrong!


use this
https://lambretta-images.com/tuningh/po ... alculator/ :)
or this
https://www.scooterhelp.com/tuning/defs.ccs.html
or this
https://www.icalculator.info/mathematic ... lator.html
or this
http://www.revetec.com/Calculators/Engi ... ator-2.htm

They all give the same result, 193.01943395806632 which most like mine round up to 193.02.

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Shaunbond
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Thu Jan 25, 2018 8:10 pm

That's because 0.785 has been rounded down its actually 0.78539816339 😁😁
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