I'm most interested in the temps 15 minutes after shut-down on a blistering hot day.
Why would you suspect that they're both dropping when the right PMag appears to be increasing in temp? Did you mistype the temps, or was it rising from heat soak? Also, why only the left side getting cooler?
...
Do you have any temp data from a shutdown with the oil door open?
Dominik
What is the issue with Pmag temps? Why different to old style mags?
Thanks.
Johan
Howdy
Sent in my pmags for repair/inspection recently and Brad was concerned that I had experienced high temps, apparently over 200F. My CHTs are fine, about 265 in cruise on a warm day. My oil temp tends to be high on a warm day, 216F the other day, but thats not above the acceptable range. I do have blast tubes to the neck of each pmag, which are 113 bodies with 114 boards.
Im considering replacing the corrugated vinyl blast tubes with some smooth-walled rubber ones to get a little better air flow in them and possibly increasing their size slightly - I think they are currently around 3/4 inch diameter.
Im also considering replacing my oil cooler for a more efficient model that will likely lower oil temps around 10 degrees. Oil coolers aint cheap. Do you suppose slightly cooler oil will make have any significant differance in my pmag temps?
I currently do not have any way of monitoring the pmag temps, but could get some of the color coded temp indcating labels I suppose. If I cant get the temps down I may have to bite the bullet and switch to a Lightspeed ignition.
Any suggestions/comments?
regards,
erich
Brad at emagair was concerned about the temps and suggested I install louvers on my cowl. WHAT?
erich
If you aren't careful, you guys just might make me go unearth my story (not quite yet).
How many have you had? All magnet related?
If you aren't careful, you guys just might make me go unearth my story (not quite yet).
HA!!! No, really, did he really say that? (I personally believe you . )
I'm intrigued with the ongoing saga here. If you aren't careful, you guys just might make me go unearth my story (not quite yet). Not that I haven't told it to anybody that will listen.
Yes, do tell! I'm about to order my engine and dual pmags is topping the list at present.
Add another interested party to wanting to hear it. I have been contemplating to replace my slick with PMAG. Still gather info.
My CHT's almost always go to 400 during climbout. Normally the oil temp is 190-200.
I have a 3/4" corrugated plastic tube blowing on the neck.
My temp dot/tattle tale label on the 114 Pmag has never turned black.
Hey Bill,
Any test results with the door open post shut down?
Curiously waiting!
Dan
OK, it was hot again today. Like 111F when I taxied out hot. What a great time to test the P-mags again for heat soaking.
Same setup as listed above, same test, only this time I waited longer. Each sample was taken at five minute intervals, after shutdown.
OAT upon landing: 105F
Temps immediately after exiting the runway: 186F & 192F (Left & Right)
At shutdown: 186F & 192F
5 Minutes after shutdown: 192F & 192F
10 Minutes after shutdown: 179F & 204F
(No idea why the left P-mag reported 179 and then jumped back up 192F.)
15 Minutes after shutdown: 192F & 204F
20 Minutes after shutdown: 186F & 204F
25 Minutes after shutdown: 192F & 199F
BTW, I've been sharing these numbers with Brad and Tom at Emag.
INTERESTING data set. It looks like with everything else being equal, max temperature (whatever the max is) will be around 15min after shutdown. A few more tests runs should verify/de-bunk this 15min idea but 3 runs with the same basic trend looks good.I was asked if I could do these tests with the oil filler door open.
Since I haven't seen 104*F temperatures this entire year and fall has hit us, I still pulled the number this evening, just to see the trends.
OAT upon landing: 63F
At shutdown: 154F & 161F
05 Minutes after shutdown: 167F & 179F
10 Minutes after shutdown: 174F & 186F
15 Minutes after shutdown: 174F & 192F
20 Minutes after shutdown: 167F & 186F
25 Minutes after shutdown: 167F & 179F
30 Minutes after shutdown: 167F & 179F
The only way this will mean anything is if I have a chance to run the same numbers on a similarly cool day with the oil filler door closed. However, you can see that the number rise and then fall after 15 minutes. I wonder if the steady state temperatures are a result of the engine block heat soaking the P-mags.
Bill; Do you have a way of recording your oil temp after shutdown? If so, it would be interesting to correlate this with the P-mag temps you have recorded.I wonder if the steady state temperatures are a result of the engine block heat soaking the P-mags.
Bill; Do you have a way of recording your oil temp after shutdown? If so, it would be interesting to correlate this with the P-mag temps you have recorded.
Duh! Why didn't I think of that.
Yes, the SkyView continues to update the temperatures. Let me see if I can grab the data and correlate it to the P-mag temperatures. It will be close but not exact.
Cool. We don't need exact numbers only the trend. It would be very interesting if the oil temps also showed the same 15min trend.Duh! Why didn't I think of that.
Yes, the SkyView continues to update the temperatures. Let me see if I can grab the data and correlate it to the P-mag temperatures. It will be close but not exact.
That is why I asked if you could record the temps "After Shutdown".Bummer, It looks like when I shut the plane down, I also powered down the SkyView. The log data doesn't exist, Oh well, I guess I'll have to do another flight.
FWIW:
At least with my airplane (Lycoming O360-A4M) there was no 15 Min peak of oil temp. I have no way of recording P-mag temps.
Oil door with spring does help!
http://www.cleavelandtool.com/Oil-Door-Hidden-Hinge/productinfo/RVHH1/#.XbFGSegzaUk
On all stops, I open the oil door. So due to thermal effect, the hot air is going out/ventilate the rear of the machine. For sure, the heat is coming from the engine