PlanetMinis Forums banner
1 - 5 of 5 Posts

·
Registered
Joined
·
8,362 Posts
Discussion Starter · #1 ·
Hey guys,

This will be helpfull for any of you guys that want to figure out your motor or a stroker motors DISPLACEMENT or "CC's"



BORE X BORE X .7854 X stroke = CC's





OK first we have to change ( millimeters ) to ( centimeters ) so lets take a true 88cc piston which is 52mm... and change it to centimeters by moving the decimal point to the left one spot... 52.0 mm to 5.2cm.



Now lets take a rod lenght of 49.5mm and change it to cm. so 4.95cm is what you would get... Now lets plug the numbers into the FORMULA..!



5.2cm X 5.2cm X .7854 X 4.95cm = 105.12421 round off to 105cc





I'd like to thank Milan at PRECISION CYCLES for bringing this subject up to my attention today and reminding me of my PHYSICS FORMULAS... SEE you learn something new everyday....OLDSCHOOL
 
G

·
also



Volume of a cylinder also = pie x radius squared x height.

Pie=3.14, radius squared = ½ your bore times itself, and height = stroke.



Stock crf450 motor has a bore of 96.0mm so it is 9.6cm and a stroke of 62.1mm that is 6.21cm. So it is 3.14 x (9.6cm / 2) x (9.6cm / 2) x 6.21cm = 449.27cc.



My bore and stroke kit for my crf450 increases bore to 98.0mm (9.8cm) and increases stroke by 7.4mm to a total of 69.5mm (6.95cm). So it is 3.14 x (9.8cm / 2) x (9.8cm / 2) x 6.95cm = 523.97cc.



Just thought I would tell everyone another way to do it.
 

·
Registered
Joined
·
8,362 Posts
Discussion Starter · #5 ·
Sorry Dez,

Didn't see it, But I ran something in Oct or Nov. on this thats why we need a HOW TO BOARD..!!!
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top