Our RV-14A with a Thunderbolt 390 Lycoming delivered by the factory late 2018 has been running well for 400 hours and almost 3 years.
It has a Slick MAG on the Left installed by Lycoming and a PMAG on the Right.
Recently we noticed that the Slick MAG drops more that 200 RPMs when we do the Run Up at 1,800 RPMs.
We have tried the following actions, but have not been successful at eliminating the >200 RPMs drop on the Slick MAG:
- Inspected Plugs: clean, spark, gap all OK
- Checked Timing at specified 20 Degrees OK
- Sent Slick MAG for inspection, no issues noted.
Had the 500 hour service performed.
- Installed the Slick MAG back and Timed it at the specified 20 Degrees
- Ran Up at 1,800 RPMs, >200 RPMs drop on the Slick MAG continue
When we cut the PMAG on cruise at 2400 RPMs
, 24 Inches MP at 4,500 Feet, the RPMs only drop 10 RPMs.
If anybody has solved a similar problem or have suggestions or additional actions to solve, we will appreciate your thoughts.
Thank You!
It has a Slick MAG on the Left installed by Lycoming and a PMAG on the Right.
Recently we noticed that the Slick MAG drops more that 200 RPMs when we do the Run Up at 1,800 RPMs.
We have tried the following actions, but have not been successful at eliminating the >200 RPMs drop on the Slick MAG:
- Inspected Plugs: clean, spark, gap all OK
- Checked Timing at specified 20 Degrees OK
- Sent Slick MAG for inspection, no issues noted.
Had the 500 hour service performed.
- Installed the Slick MAG back and Timed it at the specified 20 Degrees
- Ran Up at 1,800 RPMs, >200 RPMs drop on the Slick MAG continue
When we cut the PMAG on cruise at 2400 RPMs
, 24 Inches MP at 4,500 Feet, the RPMs only drop 10 RPMs.
If anybody has solved a similar problem or have suggestions or additional actions to solve, we will appreciate your thoughts.
Thank You!