Help! P-mags makes my engine run rough!
 

Hi.

First the gooood news: on Saturday, another RV took to the skies in Norway, and this time it was the VERY FIRST -7 ever airborne in Norway!
(pics will be posted later)
What a GREAT plane!! I'm still grinning....!

The 2 hr flight went fairly well and the plane flew straight as an arrow!

The engine started to run rough approx 5-10 mins after liftoff and it gradually became worse.
It felt and sounded like the engine missed a compression or maybe misfired slightly every 2-4 secs.
The chase plane could see that the exhaust system was "moving" during the misfiring.

I turned off the power to the P-mags in turn and let them run on their own power. For the right P-mag, there was no improvment, but when I turned off the power to the left P-mag, the engine was running like silk again.

I didn't try to turn off the mags with the igntion key at all, since the problem was solved turing off the P-mag power.

After running with the left P-mag on it's own power for approx 5 minutes, I tried to turn the power back on. After 2-4 minutes, the engine gradually started to run rough again.
When back on pmg power, the engine was smooth again.

I tried this approx 5 times, and every time the result was the same.

It was a hot day, approx 90F on ground and I flew at 2-4000' with oiltemps around 200F all the time.
Power was steady at 25/2500 for the first hour, then varied during the second hour beetween 23/2300 and 25/2500 every 15 minutes according to the engine manual.

The high ground temps made me think that this maybe could be a P-mag cooling issue?

Other temps (EGT, CHT) was ok.
I can get hard data later if neeed. (I'm at work now)

I didn't lean at all for the first hour, but leaned ever so slightly for the next hour. No improvement on the engine roughness.

I'll also contact E-mag air about this ofcourse, but it's also very interesting to hear what you guys think?

Setup:
Extreem IO-360 from Eagle Engines with a M/T 2-blade prop. 8,5 compression.
Silwer Hawk injection.
Dual P-mags.

Sooooo.... any ideas gentemen...? And women...?

Two people I know have had similar problems with their P-Mags. Solution is to contact Emagair and get their upgrade.

Congratulations!!!!!!
 

Way to go!!!!

A friend had trouble with his P/mags for a while, the factory was very helpful for him.

It seems that the earlier units had the problems, and later iterations have been working well. How long have you had the unit????

As Vern suggested, contact the factory, have your invoice available, so you can tell them when you bought, and serial number.

Again, congratulations on the first flight:D

Cool the neck!
 

Alf, talking to Brad at Emag many of the problem units are overheating he told me. You say it was very hot also, and when you turned it off it would have cooled and then when back on run more normally. Just my thoughts.

Have you got the blast tube firmly aimed at the neck of the P-mag. It is important it is cooled at the neck with plenty of air.

Mine are running superbly well with 15 hrs so far, and also very hot weather on Sunday.

Good luck! Steve.


PS Congratulations on getting airborne, but dont stay up too long on one mag!

PPS I am a bit puzzled why turning external power off is helping. I thought they always defaulted to running on their own power if there was enough. I am puzzled about that. I would give Brad a call. He is really supportive.

Upgrade and cooling ok
 

Hi again.

Thanks for the inputs.

I bought the units in 2006 (113 series) and had them in for the latest upgrade just after S&F this year.

Both P-mags have blast tubes installed per plans, aimed at the neck (the round portion)

I've tried several times today to go to their website to get their e-mail adress (I'm still at work so I don't have their e-adr here), but when entering www.emagair.com the page says I need a password and a username to go to their website??
I've been to that website many times earlier, but I've never seen that? Anyone else experiencing this or is it just the internet connection from Norway maybe?

PS: It's possible I'm mistaken, but when turning the power off to the P-mag, (NOT the L or R mag switch on the ignition key, but the combined power/CB switch) and let the P-mag run on it's own power, (PMG) I thought the P-mag still was functioning as normal?
Or is it something I have completely misunderstood here...?

The whole first flight was done circling over the airport (8000' RWY) at 2-4000' by the way...

It's broken the same way for me as well. If the virus started in Norway, it spread far and fast. :D

Hope the Emag guys get their server fixed soon...

Same Problem
 

I am having the same problem with one of my p-mags, they are of the same vintage bought in 2006 but never used until now. Just got them back last week after a software update. The mags both have 0.80 hrs them, never made it into the air yet!
The problem seemed to start after 0.50 hours during a mag check at run up. One mag ran extremely rough hence the reason both were sent back for upgraded software. On Saturday I re-installed the mags and did a run-up and mag check, the same Mag is still running extremely rough. I then swapped the mags round to make sure it wasn't an installation problem and sure enough the problem followed the mag over to the other side. This confirms that the installation was correct and the problem lies with the mag.

I am also having problems getting on their web-site I get the same message as you. I think they have server problems as I have see this before.

Unfortunetly Brad is a Oshkosh this week so it'll be next week before I can talk to him.

I will keep you posted on how I get on.

You guys should call Brad on his cell phone at Oshkosh. I bet he will answer.

e-adr and phone # ?
 

Hi.

Does anyone have Brad's cellphone number and e- mail adress?

Thanks.

I will stop by the booth and ask him for a number and send it to you e-mail.