Will the Diesel be Dead?

Learjet wrote:

Did you see the simile face...I knew it wouldn't be long before I got someone to correct me.

Technically, you were correct as you said "compression" not "compression ratio".

Compression ratio is very specific related to the volume in the cylinder as the piston goes from bottom to top.

Compression is more generic. If you look at how much the air is compressed relative to atmospheric pressure...yes, a turbo engine does have variable compression.