Q: I have a Mattituck TMX O-360 in my Glastar. During a longer climb phase, my CHTs differ up to 100°F between Cylinder No. 1 and No. 4. Leveling off and reducing to cruise power (65%) at top of climb, CHTs stabilize all within max 30°F. What could be the reason for this difference (airstream entering […]
Ask Paul
Ask Paul: Cylinders and safety
Q: I have come across your name looking for answers to the following: We had to rebuild a Lycoming 0-540-J3C5D with normal wide deck cylinders instead of the thin wide deck cylinders nine years ago and 800 flying hours. This engine just came in for a cam shaft change. Our question is can we continue the rest of the engine’s life […]
What engine is best for my Long-EZ?
As far as which engine is the most reliable high horsepower Lycoming engine for your plane, it’s a little difficult to name just one.
How to get the best technical help for your engine…and beyond
I trust by this time everyone is enjoying the summer weather and getting the opportunity to do as much flying as possible. I thought this might be a good time to focus on a subject that everyone should keep in mind when it comes to seeking technical assistance on their aircraft engine. However, what I’m […]
Is there a gentle way to determine the condition of this engine?
Q: Last year our club bought a PA-25 tow plane. It has a Lycoming O-540 G1A5 260-hp engine. We bought it with 100 hours after overhaul and flew it 95 hours, so total 195 hours after overhaul. Now the annual inspection revealed a massive contamination of the oil filter with shiny non-magnetic particles. Also some soft sealant particles (rubber or silicone) are […]
What is the proper procedure to break in my engine?
Q: What is the proper procedure to break in an IO-540-AB1A5 that I own on a 1998 C182S? We pulled and replaced the compression and oil control rings on cylinders 2 and 4. The rest of the cylinders were untouched. Where can I find Lycoming recommendations for a replacement of rings like we are about […]
Is this converted engine reliable?
Q: We recently bored a Lycoming 290-D2 engine to accept 320 cylinders (low compression) with 8.5:1 pistons. The engine has all new bearings and valves, and everything has been magnafluxed, balanced, etc. We retained a very good 290 D2 crankshaft. From experience, would you say it could make a reliable engine? Gilles St Pierre, AVIATION BSL (Canada) A: […]
Can I use these cylinders?
Q: I have several wide deck cylinders (for a Lycoming) 360 but the deck is a little bit thinner than normal and the deck looks like it is milled or radiused around the attach nuts area on the deck. I’m not sure where I got them from, but are they early style wide deck? Can I mix […]
Should we always rebuild at 2,000 hours?
If I did my math correctly, this engine has been operated approximately 38 hours, on average per year, during the 47 calendar years of its life.