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It is complicated - combustion chambers count
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Posted by jdemaris on March 27, 2006 at 07:18:23 from (69.67.229.132):
In Reply to: cubic inches? posted by Jim Johnson on March 26, 2006 at 21:39:24:
To be technical, it is not just the bore and stroke times the number of cylinders, but that gets you close. The combustion chambers are supposed to be added.
Cubin inch displacement includes the entire combustion chamber, so the area in the cylinder head - if one exists, is also supposed to be factored in. Diesels often have it in the piston head instead. With some companies, sometimes they choose to do it, and sometimes not. Also factored in is the top piston-ring height, the piston skirt clearance and the head gasket thickness.
One example is a 396 cubic inch Chevy engine. It is eight cylinders, bore 4.09" X 3.76" stroke. Chevy called it a 396 but rated the actual cubic inches as 402. The 4.09" bore is halved = thus 2.045", then squared = 4.182", then multiplied times PI (3.14), so 3.14 X 4.182" = 13.131 square inches - the area of the bore. Take the 13.131 X the stroke of 3.76" and the volume of one cylinder is 49.37 cubic inches. Multiply times the number of cylinders - 8, and it equals 394.9 cubic inches. Chevy lists it as 402 cubic inches, assuming they've added in the combustion chamber volumes and other stuff.
There are lots of calculators on the Net or as computer programs, but they require data on headgasket thickness, combustion chamber volumes, etc. in addition to bore and stroke.
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