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## CALCULATING DISPLACEMENT

I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 12/23/12 10:55 PM

If you weren't sleeping in Geometry class in High School,then you might remember that the volume of a cylinder is calculated by multiplying pi (3.1417) times the radius of the diameter squared times the length of the cylinder.
If you have a bore of 4.0 inches, then the radius is half of the diameter,or one half of 4, which is 2. With a given stroke of 3.75 inches, we can calculate the volume of this cylinder as 3.1417 X 2 X 2 X 3.75 = 47.1255 cubic inches. So now we have one cylinder at 47.1255 times 8 cylinders, that creates 377ci.
Now we can create a shortcut for this, by combining one of the earlier steps.If we substitute 0.7854 for the pi times the radius squared, we can compute
displacement by multiplying BORE X BORE X STROKE X 0.7854 X number of cylinders.
This is the short formula for computing displacement. For Example, with a bore of 4.155 and a stroke of 3.75, we will have; 4.155 X 4.155 X 3.75 X0.7854 X 8= 406.77ci.
Bob

I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 12/28/12 04:46 PM

Precisely Olde Chap....
skyeking