V1VRV2

I’ve got a cylinder from an IO-550G I’d like to have overhauled. What shop does everyone recommend and what’s the going price?

Well beyond ring flush. Pulled the cylinder and found 1 and 2 compression rings were considerably worn, oil control ring was frozen. Piston had scoring. Cylinder was scored and glazed. Exhaust valve seal was leaking oil. #3 cylinder had the hottest CHT in cruise and 2nd highest EGT. I’ll post pics of the carnage. All other cylinder compressions were in the 70’s. #3 was 60. Master orifice was 45. So the compression was still well within limits. No oil contamination on the spark plugs in cylinder #3. It was good to get to the bottom of this. Takeaway… always be observant and be vigilant of trending data. I think I’m going to switch the injector from the coldest cylinder to the # 3 which was the hottest.

OK! Number 3 cylinder compression was 60. Ther rest were in the 70’s. The leakdown showed air pressurizing the crankcase from #3 blowing oil out the breather. Replacing #3 cylinder with new including piston, rings etc.

UPDATE…. I’ve had the engine looked at by 3 mechanics. 2 compression/leak down checks. No one can find anything wrong. To note…. I have been still flying the plane and the oil loss is down to 1 quart every 4 hours instead of 1 quartevery hour. Compressions were 60 - 70. Master office was 45. So not brand new engine compressions but more than acceptable. Brian Kendrick is doing my annual so we will get to the bottom of it in October. My guess is a valve guide. Very strange! Thanks for everyone’s input. I will update after the annual.

Pulled the bottom plugs today. No oil contamination. Exhaust is clean. No oil. The only source of the oil on the belly has to be coming from the breather. Why would the crankcase be pressurizing?

Thanks for the replies. I have a mechanic coming out to look at it next week. The oil has 3.8 hrs on it and looks much darker than it should for that little time in use. We are starting to believe it’s a broken oil control ring. I will report back once I know.

I started losing oil at an alarming rate. IO550G in an Ovation. About 870 hrs. I changed my oil the other day and added 8 quarts ran the motor and did a leak check. Then topped it off with an additional quart. Showed 8 on the dipstick. Flew for 3.8 hrs. Rechecked oil 2 days after landing and I was 3 quarts low. Showing 5 on the dipstick. Previous to the oil change I did a compression check. All cylinders were 60-70. The exhaust pipes are not oily. Top plugs were inspected and five of the plugs were clean. and one was a little bit oil fouled. But not bad. I didn’t pull the bottom plugs. Engine run up and mag check is normal. No unusual loss of RPM. Belly is clean on the pax side. Dirty on the pilot side. Pilot side is where the crank case breather is located. I’m having a hard time believing this oil is being burned in the cylinders. Any ideas? Valve guide?

Am I the only one that hated it? Terrible! Save some cash and watch the real thing on YouTube. Growlers Ball! I can watch it over and over again. Amazing camera work!

Suicide… that’s where my money is going.

Made the news tonight! I was flying out of CXO and taxi’d past some cool looking water bombers. Was watching the news back at the hotel and saw this report on the water bombers training at CXO. Photobombed the news clip! All the way at the end! https://www.fox26houston.com/news/montana-aerial-firefighting-company-comes-to-conroe-for-training

I disagree with your thinking. Climb is based on airspeed not attitude. Attitude is secondary to airspeed. If you’re flight director is getting corrupted airspeed then so are you. TOGA is a generic cue. Not specific to aircraft model.

Yes… vertical nav mode. Sorry for the confusion!

Revisiting this topic… I am setting up my GFC500 flight director for IFR departure by setting the VNAV to IAS mode at 105kts which is VY in the Ovation. On climb out the FD gives me pitch commands to maintain 105 kts. PERFECT! For LNAV mode I am am bugging the runway heading and departing in heading mode. Depending on ATC I’m either getting vectors which allows me to stay in heading mode or I’m proceeding on course in which case I engage NAV mode. GFC500 has been flawless! About 100hrs of flight time now and I am loving this thing!

Not gone. It applies to 121 and 135 operators in AK and it’s 15% of MGTOW.

I have an O2 cruise at 65% power burning 12.5 gph and a TAS of 164 kts at 8,000’. Descent fuel burn I leave the same because i usually don’t pull the power back fort decent. Are you freighter trash as well? Freight Dawgs Anonymous… order of the sleepless nights!