AT­MO­SPHERIC PRES­SURE

Real Classic - - Letters -

I have noted, on a cou­ple of oc­ca­sions, cor­re­spon­dents re­fer­ring to com­pres­sion ra­tio, a men­tion of at­mos­pheres / at­mo­spheric pres­sure. This is in­cor­rect. Com­pres­sion ra­tio is cal­cu­lated by di­vid­ing cylin­der vol­ume (in­clud­ing the com­bus­tion space), with pis­ton at BDC, by the vol­ume of the com­bus­tion space alone, mea­sured with the pis­ton then at TDC.

Hope this helps.

Stephen Schofield, mem­ber 4698

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