"They will find you"

The right oil temp, inop and new equipment, and oily turbos are on tap for this episode.

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Full episode notes below:

Grace’s engine runs rough above about 2,000 rpm. She currently

has a single probe monitor, and is waiting to install a more comprehensive

engine monitor. She’s worried about running too cold, given that her oil temp is relatively low, even in the Pennsylvania summer. It’s not too low in her 180-horsepower Sundowner, Paul said. She’s unsure what’s too cool and how to check to see if there’s too much moisture in the oil, which would indicate it’s not running hot enough to burn off the moisture. Mike said that an oil analysis is the best way to tell, and so far hers have been consistently good.

 

Boris is looking deep into the regs and is wondering about equipment failures. He has a friend with a Piper Seminole and the manifold pressure gauge was inop. The gauge isn’t listed in the type certificate, minimum equipment list, etc. The current Part 23 doesn’t specifically require a

manifold pressure gauge with a controllable pitch propeller. However, 91.113(d) says that the equipment must be operational as originally certified, and Part 23 at the time required a manifold pressure gauge for an engine with a controllable pitch propeller.

 

Mark is wondering how turbos impact oil. Mike had written that the ratio of displacement to oil capacity is an indicator of how long you can go between changes. An IO-550 with a small sump calls for more frequent oil