AGK Question (Magneto Failure)
Thread Starter
Joined: Jun 2005
Posts: 5
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From: Adelaide
AGK Question (Magneto Failure)
I'm currently studying CPL AGK and have come across a question that has stumped me and alot of other pilots I have asked. The question is:
"If you have a magneto failure will this cause the engine to run hotter or cooler"
Naturally I assumed that if there is only one spark in the cylinder now, it will cause some fuel to not be burnt which can then evapourate and cool the engine, however the asnwer is hotter. Some people have answered hotter but are unable to give a descent explanation as to why. If someone could give me a more detailed explanation as too why this is the case that would be much appreciated!
Thanks
Lachy
"If you have a magneto failure will this cause the engine to run hotter or cooler"
Naturally I assumed that if there is only one spark in the cylinder now, it will cause some fuel to not be burnt which can then evapourate and cool the engine, however the asnwer is hotter. Some people have answered hotter but are unable to give a descent explanation as to why. If someone could give me a more detailed explanation as too why this is the case that would be much appreciated!
Thanks
Lachy
Joined: Dec 2004
Posts: 42
Likes: 0
From: EGNH
Interesting that the answer is hotter, as a fouled plug will cause the affected cylinder to run cooler. Using this example, a total magneto loss will cause the engine to loose power and run cooler due to incomplete combustion. The same reason the RPM drops when carrying out a mag check.
This is As I See It
however, I have been proven wrong before, but in that instance my Dad Knew the answer
This is As I See It
however, I have been proven wrong before, but in that instance my Dad Knew the answer
Joined: Nov 2005
Posts: 15
Likes: 0
From: netherlands
hello,
check this link
http://www.cafefoundation.org/aprs/ignition1.pdf
scroll down to page 4 Dual ignition operation
this explains a bit more
regards Vincent
check this link
http://www.cafefoundation.org/aprs/ignition1.pdf
scroll down to page 4 Dual ignition operation
this explains a bit more
regards Vincent
Joined: Jan 2001
Posts: 545
Likes: 1
From: Dunstable, Beds UK
As I see it - yes thats the question CHT or EGT
Most light aircraft have CHT as basic and EGT is often an add on.
Given the reason that the article gives is that the fuel is burning in the exhaust then it is possible that the CHT will decrease as less combustion is taking place in the cylinder.
Anyway if you are taking exams then you only need the answer that the exam is looking for
Most light aircraft have CHT as basic and EGT is often an add on.
Given the reason that the article gives is that the fuel is burning in the exhaust then it is possible that the CHT will decrease as less combustion is taking place in the cylinder.
Anyway if you are taking exams then you only need the answer that the exam is looking for
