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Finding Displacement

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Old Jan 8, 2002 | 01:47 PM
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Finding Displacement

Correct me if I'm wrong, but can't engine displacement be found by using bore and stroke measurements. I always figured that to find the displacement of a V8 engine you could find the volume of one cylinder by using the bore and stroke then multiplying it by eight. When I do this I get close numbers for some engines, like a 302 or 400, but if I calculate the numbers for a 460 I get 421. Am I missing something? For a 460 I used a 4.36" bore with a 3.85" stroke.
 
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Old Jan 8, 2002 | 01:48 PM
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Finding Displacement

By the way, I multiply the bore and stroke by pi.
 
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Old Jan 8, 2002 | 03:42 PM
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Finding Displacement

displacement is (pi)*(r^2)*(stroke)*#of cylinders
so the radius of a stock 460 bore would be 4.36/2 or 2.18"
2.18 * 2.18 = 4.75
4.75*3.14=14.92 sq. in.
14.92*3.85=57.44
57.44*8=456.5 cu. in.
There it is.
Craig
 
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Old Jan 9, 2002 | 10:57 AM
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Finding Displacement

NHRA rule book gives the following formula for an 8 cylinder

bore x bore x stroke x .7854 x 8 = total cubes
 
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Old Jan 9, 2002 | 11:03 AM
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Finding Displacement

 
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