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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?
Mike Hillger
Garden City, Texas
First Flight
Dues Paid
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Old 09-24-2021, 07:17 PM
pa38112 pa38112 is offline
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 1,043

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.
2004 RV6A Flying
2002 RV6A Flying
1978 PA38-112
2008 Wag-Aero Cub C-85
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Old 09-24-2021, 07:59 PM
ty1295 ty1295 is offline
Join Date: Aug 2011
Location: Jeffersonville, IN
Posts: 520

2 years, 300 hours and not a single problem with dual p mags. Have not checked my dots.
Jeff Scott
RV9A First Flight 9/30/19
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Old 09-24-2021, 08:13 PM
erich weaver's Avatar
erich weaver erich weaver is offline
Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,803

Yup. Itís the same deal for everyone with pmags, at least in warm or hot weather.
Santa Ynez, CA
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Old 09-25-2021, 01:15 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
Join Date: May 2007
Location: Gearhart Oregon
Posts: 503

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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Randall Henderson
RV-6 / O-360 / CS, 1600+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000, Craftsmanship award AWO 2000
Airport committee chair & AOPA ASNV for Seaside, OR Municipal (56S),
Last Donated January 2022
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