SwimmingDragonfly96
Well Known Member
This is going to be a longer post, so anyone who reads this, I appreciate it.
I've been battling high CHTs likely due to poor baffle sealing but while I get that sorted, my A&P agreed to retard my timing to 23 on both my slick mags (engine is a lyc YO-360-A1A with about 300 hours hobbs on it). The mag retarding helped CHTs tremendously, albeit at a slight loss of power, but acceptable for me to be able to climb like I want to. The other day, after a very long taxi at the KMCC zoo of an airport trying to find the FBO, I started her back up and she wasn't purring like normal, but still running alright. I did my mag check at run up, about 150 drop on both sides, entered the runway, applied throttle smoothly as normal, and the engine stumbled around 1200-1500 RPM. It was hot outside and the engine was quite hot from the previous long taxi. KMCC has a long runway, so I decided to go for it anyways. Took off, did a 2 hour bay tour, returned, dropped off my passenger, and went back to KSQL. No issues in flight at all.
Fast forward to today, 3 days after the engine stumble, started her up for my commute from KSQL to KCRQ. Run-up uneventful, everything looked good, took off with no problems and went about my merry way. Nice tailwind, cruising 190kt and even passed 200 at one point. At some point, I glanced at my airspeed indicator and it looked like I had dropped about 10 knots without any power adjustments, I looked over at my JPI-700 and all my EGTs were suddenly about 100-150deg higher than they were before. I'm a newb, and couldn't diagnose on the fly, so I richened the mixture, got my EGTs where I wanted them, and continued my flight. My TAS didn't come back up, and my fuel flow was a full 1.5gph higher than normal. 20 minutes later, glanced down, and all my EGTs had reduced back by 100-150 degrees, I leaned the mixture, indicated airspeed came back up to where it was before, and fuel flow was where I would expect it right around 8.5 gph. After the commotion and my mind calmed down a bit, I realized one of my mags must have failed and then came back to life. The rest of the flight was uneventful.
Leading edge aviation at KCRQ is going to check out my plane and see what's up as I'll have it parked there for the next 10 days or so. Not sure how much diagnosing they'll do being that it's experimental, but if anyone else is around KCRQ and could come and help me out at some point if they don't get anywhere, I would much much appreciate it.
Thanks and sorry for long-winded post.
I've been battling high CHTs likely due to poor baffle sealing but while I get that sorted, my A&P agreed to retard my timing to 23 on both my slick mags (engine is a lyc YO-360-A1A with about 300 hours hobbs on it). The mag retarding helped CHTs tremendously, albeit at a slight loss of power, but acceptable for me to be able to climb like I want to. The other day, after a very long taxi at the KMCC zoo of an airport trying to find the FBO, I started her back up and she wasn't purring like normal, but still running alright. I did my mag check at run up, about 150 drop on both sides, entered the runway, applied throttle smoothly as normal, and the engine stumbled around 1200-1500 RPM. It was hot outside and the engine was quite hot from the previous long taxi. KMCC has a long runway, so I decided to go for it anyways. Took off, did a 2 hour bay tour, returned, dropped off my passenger, and went back to KSQL. No issues in flight at all.
Fast forward to today, 3 days after the engine stumble, started her up for my commute from KSQL to KCRQ. Run-up uneventful, everything looked good, took off with no problems and went about my merry way. Nice tailwind, cruising 190kt and even passed 200 at one point. At some point, I glanced at my airspeed indicator and it looked like I had dropped about 10 knots without any power adjustments, I looked over at my JPI-700 and all my EGTs were suddenly about 100-150deg higher than they were before. I'm a newb, and couldn't diagnose on the fly, so I richened the mixture, got my EGTs where I wanted them, and continued my flight. My TAS didn't come back up, and my fuel flow was a full 1.5gph higher than normal. 20 minutes later, glanced down, and all my EGTs had reduced back by 100-150 degrees, I leaned the mixture, indicated airspeed came back up to where it was before, and fuel flow was where I would expect it right around 8.5 gph. After the commotion and my mind calmed down a bit, I realized one of my mags must have failed and then came back to life. The rest of the flight was uneventful.
Leading edge aviation at KCRQ is going to check out my plane and see what's up as I'll have it parked there for the next 10 days or so. Not sure how much diagnosing they'll do being that it's experimental, but if anyone else is around KCRQ and could come and help me out at some point if they don't get anywhere, I would much much appreciate it.
Thanks and sorry for long-winded post.