Ant CB
Member
Hi all,
I've got an AEIO-360-A1A fixed pitch with 10:1 CR pistons. I've noticed that there is vibration/roughness which is directly proportional to manifold pressure. For example, at 2400RPM in the cruise at half throttle it's a lot less than 2400RPM climbing at full throttle.
At 2000RPM run-up there is an even mag drop of about 125-150RPM.
I've checked and replaced intake gaskets, installed new injector nozzles, had the servo flowed, installed new plugs and today was going to install a new ignition harness when I found oil in the harness cap at the mag end.
I told my engineer and he said the mags might be playing up. I pulled them both off to have them inspected and I found one is a 4271 and one is 4370. The 4271 was made in 1990 and the 4370 was made in 2000. The younger one looks okay to the untrained eye but the older one has some pretty good black buildup on the contacts where the harness attaches. I can't vouch for either's time in service but I'm pretty certain the younger was brand new when installed and has around 450hours on the. The older one, I've no idea.
Has anyone else has similar symptoms with bad mags?
So now I'm thinking, I can:
1. Exchange one Slick and get a p-mag for the other side.
2. Exchange both and have two new Slicks
3. Send them in for service ( I was quoted 6 hours labour per mag plus parts) and see if they can be recovered.
BTW, if I send my old one in for a core exchange, how much of it do they want or do I send the whole thing in? Gears as well?
Lots of questions I know...
I've got an AEIO-360-A1A fixed pitch with 10:1 CR pistons. I've noticed that there is vibration/roughness which is directly proportional to manifold pressure. For example, at 2400RPM in the cruise at half throttle it's a lot less than 2400RPM climbing at full throttle.
At 2000RPM run-up there is an even mag drop of about 125-150RPM.
I've checked and replaced intake gaskets, installed new injector nozzles, had the servo flowed, installed new plugs and today was going to install a new ignition harness when I found oil in the harness cap at the mag end.
I told my engineer and he said the mags might be playing up. I pulled them both off to have them inspected and I found one is a 4271 and one is 4370. The 4271 was made in 1990 and the 4370 was made in 2000. The younger one looks okay to the untrained eye but the older one has some pretty good black buildup on the contacts where the harness attaches. I can't vouch for either's time in service but I'm pretty certain the younger was brand new when installed and has around 450hours on the. The older one, I've no idea.
Has anyone else has similar symptoms with bad mags?
So now I'm thinking, I can:
1. Exchange one Slick and get a p-mag for the other side.
2. Exchange both and have two new Slicks
3. Send them in for service ( I was quoted 6 hours labour per mag plus parts) and see if they can be recovered.
BTW, if I send my old one in for a core exchange, how much of it do they want or do I send the whole thing in? Gears as well?
Lots of questions I know...
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