SR20
Flight Crew Commercial; Flight Crew Flight Instructor
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Departure Airport
Aircraft
On engine start and run up; no abnormalities observed. Once in cruise flight; engine began to shake badly; power indications seemed normal; CHT & EGT temperatures showed normal. PIC contacted approach and returned to [departure airport].
The reporter indicated that Maintenance found a broken valve in one of the engine cylinders.
A SR20 flight instructor reported a severe engine vibration in cruise that resulted in a return to the departure airport. It was later discovered that a cylinder valve was broken.