Page 1 of 4
How Many CC’s
Posted: Mon Jan 22, 2018 1:00 am
by Lamaddict
Suzuki 185 (64mm) piston and a 115x60 crank. What would the CC’s be?
Re: How Many CC’s
Posted: Mon Jan 22, 2018 1:37 am
by Darrell Taylor
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
Re: How Many CC’s
Posted: Mon Jan 22, 2018 6:25 am
by garry inglis
We're does the 0.785 come from why not 1mm
Re: How Many CC’s
Posted: Mon Jan 22, 2018 9:09 am
by Scooterdude
Use one of the on line calculators : 193cc
Re: How Many CC’s
Posted: Mon Jan 22, 2018 1:14 pm
by Shaunbond
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.
Re: How Many CC’s
Posted: Mon Jan 22, 2018 2:44 pm
by garry inglis
thanks shaunbond
Re: How Many CC’s
Posted: Tue Jan 23, 2018 8:57 am
by Chris in Margate
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.
Re: How Many CC’s
Posted: Tue Jan 23, 2018 9:15 am
by Scooterdude
Bit beyond me all this pi stuff, but I like Darrell’s explanation which I have memorised for future reference.
Re: How Many CC’s
Posted: Thu Jan 25, 2018 4:52 pm
by eden
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.
Re: How Many CC’s
Posted: Thu Jan 25, 2018 8:10 pm
by Shaunbond
That's because 0.785 has been rounded down its actually 0.78539816339
