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  #1  
Old 09-24-2021, 05:55 PM
MikeyDale's Avatar
MikeyDale MikeyDale is offline
 
Join Date: Aug 2012
Location: Garden City Texas
Posts: 929
Default Heat Soaked P-Mags

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?
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  #2  
Old 09-24-2021, 07:17 PM
pa38112 pa38112 is offline
 
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Location: Clarksboro, NJ
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Default

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.
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  #3  
Old 09-24-2021, 07:59 PM
ty1295 ty1295 is offline
 
Join Date: Aug 2011
Location: Jeffersonville, IN
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2 years, 300 hours and not a single problem with dual p mags. Have not checked my dots.
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  #4  
Old 09-24-2021, 08:13 PM
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erich weaver erich weaver is offline
 
Join Date: Aug 2006
Location: santa barbara, CA
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Yup. Itís the same deal for everyone with pmags, at least in warm or hot weather.
Erich
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  #5  
Old 09-25-2021, 01:15 PM
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rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
Posts: 503
Default

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.
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