Just wondering what the formula that is used to determine cubic inches of a motor?

 

http://www.idavette.net/tech/inch_lit.htm
heres a calculator if that helps

 

um, if you knew the bore and stroke of the engine in inches, then I suppose you could do a little math and get it. just find the surface area of the piston and multiply it by the height that the piston travels...by all means, correct me if I'm wrong

 

Nope your right.. simple geometry

 

Bore X Bore X Stroke X 0.7854 X #of cylinders = Total displacement

So a 6.0L would be 4.00 X 4.00 X 3.62 = 57.92 CI X 0.7854 =

45.490368 X 8 cyls = 363.922944 CI

 

Isn't it approx 60 ci/liter? Good if you don't care about being exact.

 

pi(r)^2 (L) (# of cyl.'s)

r= 1/2 of bore
L=stroke
pi=3.14 of course

 

If you don't know bore and stroke.To get you very close use this.

liters x61.02 = cubic inches

 

There is no way to start with a litre value and be exact because it is already rounded off. A 6.0L is actualy a 5.963605283328L, times that by 61.02 and it does come very close 363.89CI vs 363.92 CI.

 

If you read my post I said CLOSE, not anything about exact. There are a lot of people that don't know the bore and stroke on their motor or were to find it out. Most do know the liters on their motor. So this is a easy and fast way to get close to ci.