I am building a Velocity and it happens that I purchased a zero time rebuilt 250-hp Lycoming IO-540-C4B5 engine. I have been told by a maintenance shop that the only difference between a C4B5 and a D4B5 is the setting of the fuel servo. The D4B5 is rated at 260 horsepower, and they claim they can adjust the servo to convert the C4B5 into a D4B5.
Lycoming
Is what I’m doing protecting my aircraft from corrosion during the winter?
The short running of the engine pumps heavier oil throughout the engine. Better corrosion protection is the theory. What is your opinion?
Ask Paul: My engine sounds like it has an exhaust leak
A reader has two questions for Paul McBride, the General Aviation News engines expert, about the Lycoming O-235-C1B engine in an amateur-built Wag-Areo Cub.
CubCrafters debuts new engine for Carbon Cub
The new engine is a fixed pitch version of the larger displacement 186-hp fuel injected constant speed prop CC340 engine first introduced by CubCrafters in 2017.
2022 dates for Lycoming Engine School released
The five-day school is offered 12 times in 2022.
Ask Paul: Adding insult to injury
If an engine conversion to 8.5:1 compression ratio pistons was not approved by Lycoming, the conversion to 9.5:1 in your engine is adding insult to injury.
Ask Paul: A reader tip may solve the problem
A reader’s solution for his engine troubles highlighted in a recent “Tips & tricks from our readers” post may hold the answer for this aviation maintenance pro and the engine problem that’s frustrating him.
Ask Paul: Is my engine burning too much oil?
My new engine is burning a quart of oil every four to five hours. Some “experts” are telling me I probably have glazed cylinders and others say just keep on flying it hard and the consumption will drop. Should I be concerned?
What’s causing the high level of aluminum in this engine’s oil?
What could cause such high levels of aluminum in the oil? Inactivity plays a big role, according to our engines expert Paul McBride.