Wow impressed with your teaching skills ....i am a fleet mechanic ...do have a couple good helpers ....the good ones just love when i explain them how it all works ...they others are like Good Enough it runs ....
0:51- what was that sound, while rotating the prop? Also just had a random question; how do you know if you have a bent or spalled cam? I’ve looked at the lobes on mine, and they looked fine. For some reason, when I rotate the crank, the cam gear makes that same sound that’s in this video. I am in the process of over hauling a Lycoming IO-360 A1A. I timed it to the #1 cylinder, and was rotating the crank, and the cam gear kind of makes a loud tick/click sound, close to like the one in this video. I have a video of it, on my channel if you want to check it out. Any ideas what it could be? Thanks.
Very basic answer: That is an impulse coupling, basically a spring loaded coupling between mag and engine. When it snaps it essentially is making the mag faster in order to produce enough current to produce a spark. Used for starting the engine. When running counterweights basically take the coupling out of the picture.
The impulse coupling delays the spark and increases spark energy at low rotational speeds, which facilitates engine start. Each engine cylinder has 2 spark plugs, upper and lower. All the upper plugs are fired by one magneto, all the lowers by the other magneto. So a single impulse coupling is all you need to get a strong late spark on all 4 cylinders, so the other magneto doesn't need one and can thus be simpler.
That would be early, but I think you have it backwards. Spark fires before TDC not after so if you’re firing at 24 degrees before TDC that would be 1 degree later then 25 degrees so it would be firing late.
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you're a good teacher. I used to have one teacher like you and that are the way things never forgotten. Good video!
Thank you for this video. I have learned so much here than the HCC Aeronautics College.
Wow impressed with your teaching skills ....i am a fleet mechanic ...do have a couple good helpers ....the good ones just love when i explain them how it all works ...they others are like Good Enough it runs ....
Just found this golden video.
Thank you.
Great teaching skills♥️
Love from sri lanka 🇱🇰
I love this A&P teacher, he's so good!!
Excellent video and real-world instruction
Exactly what I was looking for!
This is the best vídeo for learn about magneto.
Excellent video. Thank you
Watching this at 3am 😅
Wish I can gain his knowledge increase my chances of getting my a&p good teacher
Part of my P/p Pratical Exam. Time a MAG from installation to run-up to test for MAG/RPM drop.
Which state?
took it in Frankfurt ,Germany@@kawika8437
0:51- what was that sound, while rotating the prop?
Also just had a random question; how do you know if you have a bent or spalled cam? I’ve looked at the lobes on mine, and they looked fine. For some reason, when I rotate the crank, the cam gear makes that same sound that’s in this video. I am in the process of over hauling a Lycoming IO-360 A1A. I timed it to the #1 cylinder, and was rotating the crank, and the cam gear kind of makes a loud tick/click sound, close to like the one in this video. I have a video of it, on my channel if you want to check it out. Any ideas what it could be? Thanks.
Very basic answer: That is an impulse coupling, basically a spring loaded coupling between mag and engine. When it snaps it essentially is making the mag faster in order to produce enough current to produce a spark. Used for starting the engine. When running counterweights basically take the coupling out of the picture.
good job
Perfect!
Why only one magneto have impuls coupling?
The impulse coupling delays the spark and increases spark energy at low rotational speeds, which facilitates engine start. Each engine cylinder has 2 spark plugs, upper and lower. All the upper plugs are fired by one magneto, all the lowers by the other magneto. So a single impulse coupling is all you need to get a strong late spark on all 4 cylinders, so the other magneto doesn't need one and can thus be simpler.
Make sure mag switches are off,and leads disconnected,,, otherwise you may have a bad day!
Speak spanish? One question?
Hablo Español y soy mechanico. Díme.
If it's supposed to fire at 25° after TDC and is firing at 24°, isn't that early not after, right?
That would be early, but I think you have it backwards. Spark fires before TDC not after so if you’re firing at 24 degrees before TDC that would be 1 degree later then 25 degrees so it would be firing late.