Is this right??

[Fastbird93]

I'm talking with a buddy of mine, and having never knows the formula for figuring out an engine displacement, I came to this conclusion:

Bore Circumference X Stroke X 8 = Displacement

I.E.

(4.030 Bore) 2.015 x 2.015 x 3.14 = 12.7491065 Bore Circumference.

12.7491065 x 3.48 x 8 = 354.93512496 of 355

Did I go about this correctly???

[Injuneer]

Your calc's are OK, but you are not talking about "bore circumfrence"... you are talking about (and calculating) bore area.

And the results will be affected by how accurate you make "pi"...

pi = 3.14159265359........

Diameter / 2 = radius = 4.03 / 2 = 2.015

Radius squared X pi = area = 2.015^2 * 3.14259 = 12.75558

bore area x stroke = 12.7555 X 3.48 = 44.389

8 cylinders = 8 X cylinder volume = 44.389 X 8 = 355.114

[Fastbird93]

Yeah, it's been a LONG time since I thought about circular calculations. I had the right formula though, just wasn't using Pi to the degree you were.

Thanks for the correction though on the area/circumference of a circle. I had the right formula for the area but was calling it the circumference. Now if I could only remember the formula for the circumference....

*Edit* 2(Pi)R!!! Bam!

[Injuneer]

Your approach was fine... just called it the wrong thing.

Circumference is the distance around the outside of the circle... e.g. the distance your car travels in one rotation of the tire.

Circumference = Diameter X pi