The O - 240 was a new engine design generally similar in overall dimensions to the Continental O - 200 , but with a higher 8.5:1 compression ratio , designed run on 100/130 avgas .
The O - 240 was a new engine design derived from the six cylinder Continental O - 360 and introduced in 1971 . 
 It is generally similar in overall dimensions to the Continental O - 200 , but with a higher 8.5:1 compression ratio , designed run on 100/130 avgas .