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In 1977, two of us, both MechEngrs, very familiar with an O-300D powered 172H over the almost dark woods of N Wisconsin, about 2/3 full of pure AvGas, climbing for a several thousand feet on BOTH, in unusually smooth air. The engine stumbled briefly, and quit firing for at least 10 long...

To the OP - Your only "problem" is that you probably sounded like a more experienced pilot on your radio transmissions.....:)

No body has mentioned barf?

My rough estimate is about 1.4 gallons of water, but I wasn't a ChemE. Probably more important is the dew point of exhaust combustion gasses is about 180 degF.

I think theoretically there is also a considerable NEGATIVE voltage spike generated on any devices including a solid state regulator, that are not seeing the battery as a ballast. For example, if alternator is generating a substantial current when the battery somehow disconnected including via...

Warning tho - it is not an easy first-time-with-a-soldering-iron installation!

I installed a Headsets Inc ANR kit in my DC H10-40 about 25 years ago & got very impressive results. They operate on a completely different principle being an analog bucking circuit instead of a digital recursive algorithm bucking circuit (I know enough of the technology to only be dangerous)...

If this is a 4 cyl engine with a front mounted alternator, the whole assembly is exposed to a 2/rev vibration around the vertical axis thru the engine CG due to the dynamics of any opposed engine with 4 cylinders. That's probably what fatigued the connection off. The wire has probably been...

The Cessna flaps are an excellent example of brilliant engineering.

(starting breaker?). Does it start OK when the tank pressure is near zero? You may just have a wimpy power service source. If so, you need to either relieve the starting back pressure, or get a smaller compressor that doesn't load the power line so much.

Wow! That got quite a response! Now what's everyone's opinion on torque wrench types (beam/dial vs click type). Remember Continental says to apply torque for 5 seconds. I don't see how that can be done with a clicker type, yet many swear by them.

The number that seems sorta accepted for motorcycles is 75% of the spec'd torque if you use antisieze. Presume that would be on the threads and under the lug nut thrust surfaces too. I'm surprised it isn't spec'd more often as the preload/torque relationship should be much more consistent with...

I think there is a "time since last run" effect that would have a major effect on cam damage potential on cold start. IOW if it was just run yesterday maybe you could get by with a 10 degF start without preheat, but if it had been two weeks, that cam would be awfully dry - and dry for a while...

Park facing downwind, with styrofoam plugs in the cowl air intakes if you have them. Assuming two plugs, tie them together with a short rope so the prop will rip them out if you forget to remove them! DAMHIK!

To the OP - Your old engine sounds ideal as is for a homebuilt. An engine at TBO can probably withstand a lot more overheating etc abuse than a brand new one.

From wikipedia - Tribology is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear. Tribology is highly interdisciplinary, drawing on many academic fields, including physics, chemistry...

As a MechEngr I have a hard time accepting they rotate in normal service, but I also know rotation has been proven and accepted by radioactive tracer analysis. I'm forced to accept rotation.:(

I must have a chart posting problem \ The data shows dissolved water solubility of various hydrocarbons vs temperature, and how the solubility goes down with cold temperatures. The snow described above could be seen in a large fruit jar of sampled FBO gasoline that had been chilled. A very...

This may be your source of small but not trivial amounts of water. I had an engine failure on a 172H on a bitterly cold day that was traceable to a tiny amount of "snow" in the gascolator screen which starved the engine for takeoff fuel flow after getting maybe 200 ft of altitude. The data is...

Conversation at Oshkosh with someone selling a beautiful polished C-170 - "Yeah Dad's getting to old to fly." - Q - "Still Drives?" -- A- "No." - Q- "What went first? Driving or flying?" --- A - "Hmmmm ---- Driving." My conclusion - Flying is not a reflexes thing as much as a judgement...