What do "engine numbers" mean?.....

[jjguitar]

When someone says an engine is a "302", a "340", and so on, what is this number referring to?

[enginerd]

That number is the cid or cubic inch displacement. Standard measures volume with cubic inches. Metric measures volume with literes. If an engine is a 302, that engine displaces 302 cubic inches. The distance between the bottom most point of the piston travel to the top most point of travel is the displacement. 302 cid = 5.0 liters.

[ivymike1031]

just being anal:

The distance between the bottom most point of the piston travel to the top most point of travel is the displacement.

That's the stroke; the displacement is stroke multiplied by (pi*(cylinder bore)^2)/4, or in simpler terms, (stroke)*(bore area).

[jjguitar]

lol, thanks!

[enginerd]

Originally posted by ivymike1031
just being anal:



That's the stroke; the displacement is stroke multiplied by (pi*(cylinder bore)^2)/4, or in simpler terms, (stroke)*(bore area).

Yeah, yeah you got me there.:o