Heat Soaked P-Mags

MikeyDale · #1 09-24-2021, 05:55 PM

I'm a little worried! I bought and installed dual P-mags last week. I read about the importance of having blast tubes on the mags and I do. The documentation warns about letting the mags reach 200 deg F. They even have a small sticker on top of the mag that turns black when you get them over 200 deg. I test flew the mags a few days ago for a short flight in the cool morning and they did great! I noted the little dot didn't turn black indicating over 200 deg. All is good. Then today I go up for about an hour and a half doing touch and goes and kinda wringing them out. It was 84deg this afternoon which is pretty cool for West Texas. I come in and pull the plane in the hanger and pop open the oil door and all is good. The little sticker is still white. The I got curious and got my infrared heat thermometer and checked the temp of the mag. It was about 190 but I noticed it was climbing! I could feel a lot of heat coming out of the oil door and I have an open anti-splat cowl flap. The temp topped out at 216 degrees before it started cooling off! And, you guessed it, the little tattle tail dot was black!........My question is, I know there are a lot of RV's out there using these P-mags, how do you keep them from overheating when you shut down the engine?

pa38112 · #2 09-24-2021, 07:17 PM

I just don't worry about it. I think the bigger issue is running them when they are over 200F. There is no way you are going to stop them from hitting 200F after shut down.

ty1295 · #3 09-24-2021, 07:59 PM

2 years, 300 hours and not a single problem with dual p mags. Have not checked my dots.

erich weaver · #4 09-24-2021, 08:13 PM

Yup. It’s the same deal for everyone with pmags, at least in warm or hot weather.
Erich

rv6n6r · #5 09-25-2021, 01:15 PM

Good to know I'm not the only one. I have about 800 hrs on my right emag, so far so good even though it has gone above 200 degrees. I did ditch the dots and got some 3 point temperature strips from McMaster-Carr. Mainly it tells me that I can go a while without hitting 200 or 210 but eventually I do. Really it just tells me the same thing with a little more detail, no help on how to keep it from happening. Oh well.