# What does CC refer to when describing an engine?

I have been learning about various older cars on Wikipedia. I've always wondered what the "cc" refers to in the engine description. For example:

• 1964–1969 Porsche 911: 1991 cc
• 1965-1969 Porsche 912: 1582 cc
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1 cc = 1 cubic centimeters (volume of displacement) 1000 cc = 1 L, so a 2 Liter car ~ 2,000 cc

Some American cars are listed in ci or cid (cubic inches of displacement). 1L = 61.02 cid, so the Ford '5.0L engine' is their 302 cid engine.

See this wikipedia article on Engine Displacement units of measure for more details.

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Cubic centimetre

It's the amount of displacement of the engine

One complete cycle of a four-cylinder, four-stroke engine. The volume displaced is marked in orange.

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Do you mean "displacement"? So if I understand correctly, it's the same thing as when they say a "2.0 Liter engine" only in this case for the Porsche 911 it's 1.991 Liter engine? – Andrew Dec 29 '13 at 7:23
Exactly. You will find it used with smaller displacement engines (something less than a liter displacement) or older engine descriptions. With newer engine descriptions they tend to just round the numbers, so "1991cc" becomes "2l" or "2.0l". – Pᴀᴜʟsᴛᴇʀ2 Dec 29 '13 at 11:58
@Andrew Yes Displacement lol. It was late when I wrote that. :) – Move More Comments Link To Top Dec 29 '13 at 17:47
This may be out of topic but if I understand correctly the figure, by altering the route of the cylinders you can change (increase or decrease) the volume displaced. Is this correct? – Vaggelis_Z Dec 31 '13 at 11:41
@Vaggelis_Z No, displacement is simply the volume of air pumped through the engine in one complete cycle. – Move More Comments Link To Top Dec 31 '13 at 17:52