Ford Repair: compression ratio, combustion chamber volume, air fuel mixture

Question
Hi Ken,
What is a compression ratio?  What do the numbers 9.2 to 1 mean?
Thank you,
Randy


Answer
Randy,

I am going to answer your question in the good faith that you are not asking me a homework question.

A compression ratio expresses how much air/fuel mixture will be compressed during the compression stroke. It is defined as the ratio of the volume in the cylinder above the piston when the piston is at BDC to the volume in the cylinder above the piston when the pistion is at TDC. 9.2:1 is the total piston displacement plus the combustion chamber volume divided by the combustion chamber volume.

Now that I have answered your homework question, I am going to ask that you do not write to me for answers of this nature again as I do not answer homework questions and will not do so again.


Ken