to find an engines displacement as in cubic inches or liters is the bore and stroke x, then x by cylinders?

Question

to find out how big a cars engine is do i muliply the bore and stroke then multiply this number by the number of cylinders or what. explain please and give an example or 2 if you could. thank you.

Answer 1

Nope,
You need the area of the circle,
(Pi R^2)x the height of the cylinder
to get volume so:
its 1/2 bore squared
x Pi (use 3.14)
x Stroke
x No. of cylinders.

Answer 2

Hi,
Cylinder Volume = pie x radius-squared x height

So in terms of motorcycles you're usually given the bore and the stroke in mm (millimeters), using the above formula

pie = 3.142
radius-squared = half the bore x half the bore
height = stroke

eg a Honda 125 where bore 58mm and stroke 47.2

pie = 3.142
radius-squared = 29 x 29
height = 47.2

this gives us

Volume = 3.142 x 841 x 47.2

= 124722.3184 (this is mm cubed)

To convert this in CC divide by 1000

this gives us 124.7223184 or approx 125cc

This example is for a single cylinder so multi cylinder bikes just multiply this answer by the number of cylinder in the engine.

Hope this helps.
Eric.

Answer 3

It's half bore squared eg 90/2=45 --- 45X45=2025
Times pi 3.142 --- 6362.55
Times the stroke say 70mm --- 445378.5
Divided by 1000 --- 445.3785
This is the capacity of one cylinder in cc, so multiply it by the no. of cylinders and there you are.

Answer 4

.7854xborexborexstrokexnumber of cylinders

Answer 5

stepson is a diesel mechanic he said yes thats how you work it out