Re: [FWDLK] Displacement calculations.

["Daniel Davids" <ddavids@xxxxxxxxxx>]

The volume of a cylinder is not simply PI X Bore X Stroke.
It is the area of a circle times height; or, PI x r(squared) x h

Using engine terminology, this becomes:

PI x (bore/2)**2 x stroke x no. of cylinders

For your measurements,

3.14159 x 3.63/2 x 3.63/2 x 3.80 x 8 = 314.6


Dan Davids
Seattle

----------
>From: "Rimington, Ken" <Ken_Rimington@xxxxxxx>
>To: L-FORWARDLOOK@xxxxxxxxxxxxx
>Subject: [FWDLK] Displacement calculations.
>Date: Fri, Aug 20, 1999, 12:23 PM
>

> I confused myself.  Sometimes that is not a difficult task.  I tried to
> calculate the approximate displacement of my engine to see what effect
> boring the block would have.
>
> I have a 1956 315 CID Poly Super Red Ram engine.
>
> The bore is 3.63 inches and the stroke is 3.80 inches as listed in the 1956
> Dodge service manual. Volume of a cylinder is PI X Bore X Stroke.  For my
> data that comes out to 346.28 cubic inches(8 cylinders). I need to add the
> volume of the combustion chamber in the heads and the head space of the
> pistons.  This is much larger than 315 CID.
>
> How did this engine get rated at 315 CID?
>