Posted by Indiana Ken on August 12, 2015 at 08:16:03 from (67.163.32.18):
In Reply to: Compression Ratio posted by Moondoggie on August 12, 2015 at 07:28:59:
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Compression ratio (CR) is defined as; the volume at bottom dead center (BDC) divided by the volume at top dead center (TDC). CR is based on volumes and does not translate directly to pressure, since compression does not begin until the valves are closed. For this reason, refer to the manual for the engine cranking compression pressure in PSI.
Note: At BDC the total volume is the cylinder volume ((3.14 x bore x bore / 4) x stroke), or swept volume (Vs) + the combustion chamber volume or clearance volume (Vc).
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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