Hi All,
I have a stock thunderbolt IO-540 supplied through Vans in my RV10 that I built 3 years ago. Engine time is 107 hours now.
I think I had a problem on break in. It was hot and at high altitude. Despite full rich, the engine got close to 400F at first flight, but then temps settled down quickly afterwards. Changed to AD oil after 10 hours.
Temps are now around 320F to 380F in cruise, 5 and 6 are the hottest cylinders. Oil consumption is about 1 quart every 6 hours. I keep the oil level around 6 to 7 quarts. Any more and it chucks it out sooner. Not getting any smoke or oil on the belly. Plugs were clean and not fowled at the last check.
My local mechanic said it sounded ok, but probably that break in was not completed, so to change back to mineral oil for the next 50 hours, and then see what happens.
I have been reading a lot of similar cases on the forum where this is glazing. Will the re-run for 50 hours on mineral oil achieve anything? or is the solution to re-hone, re-ring, and then do the break in again.
What should I do to confirm if this is the case, and if re-hone and re-ring is necessary, what parts and tools will I need to order to do the work, as I dont think anyone locally has the parts or tools.
Thanks and regards
Amer
I have a stock thunderbolt IO-540 supplied through Vans in my RV10 that I built 3 years ago. Engine time is 107 hours now.
I think I had a problem on break in. It was hot and at high altitude. Despite full rich, the engine got close to 400F at first flight, but then temps settled down quickly afterwards. Changed to AD oil after 10 hours.
Temps are now around 320F to 380F in cruise, 5 and 6 are the hottest cylinders. Oil consumption is about 1 quart every 6 hours. I keep the oil level around 6 to 7 quarts. Any more and it chucks it out sooner. Not getting any smoke or oil on the belly. Plugs were clean and not fowled at the last check.
My local mechanic said it sounded ok, but probably that break in was not completed, so to change back to mineral oil for the next 50 hours, and then see what happens.
I have been reading a lot of similar cases on the forum where this is glazing. Will the re-run for 50 hours on mineral oil achieve anything? or is the solution to re-hone, re-ring, and then do the break in again.
What should I do to confirm if this is the case, and if re-hone and re-ring is necessary, what parts and tools will I need to order to do the work, as I dont think anyone locally has the parts or tools.
Thanks and regards
Amer