{HEAD ~ An engine} 14 wherein {TAIL ~ said timing means} is adjustable to vary the compression ratio up to 40:1 
wherein
{ HEAD ~ An engine } 14 wherein { TAIL ~ said timing means } is adjustable to vary the compression ratio up to 40:1
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH