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12-27-2015, 12:03 PM
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Join Date: May 2006
Location: Sammamish, WA
Posts: 652
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P-mag and basic Van's instrumentation...
I'm replacing one of my slick mags with a p-mag. I have basic Van's CHT and EGT gauge on #3 cylinder. I lean to rough and richen a little. Will I still be able to lean to rough with a p-mag? I'm not planning on upgrading my instrumentation.
Should I be rethinking my p-mag decision some given my instrumentation.
What do you think? Does anyone else run p-mags with basic instrumentation?
Thanks,
Michael-
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Michael Burbidge
Sammamish, WA
RV-14A Empennage
RV-9A Flying?340 hours!
Last Donation: December 2019
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12-27-2015, 12:14 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,208
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I ran a Pmag for some time in my RV-6 which has J-3 instrumentation. You should be fine.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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12-27-2015, 02:43 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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The only difference that you might see is that it takes a lot more leaning to get to "rough".
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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12-27-2015, 04:18 PM
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Join Date: Jul 2007
Location: Warwickshire UK
Posts: 703
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My set-up is similar to yours. No problem and I concur you can lean quite a bit more before it goes rough.
In fact the cylinder on the EGT gauge goes a fair bit lean of peak. No idea about the other cylinders of course!  |
12-27-2015, 06:55 PM
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Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 992
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pmags lean
I have two Pmags with carb 0320. It will lean to about 1350 F with 150F spread. Of course, YMMV due to EGT position/calibration.
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Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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12-28-2015, 09:32 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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Larry, I'm guessing that 1350 is well on the other side of the hill? The -8 starts to stumble around 1350 as well, but that is WAY (125) past peak with this airplane.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
Last edited by Toobuilder : 12-28-2015 at 09:35 AM.
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12-28-2015, 10:49 AM
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Join Date: May 2006
Location: Sammamish, WA
Posts: 652
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Thanks
Thanks for the responses. Sounds like I'll be good with my basic instrumentation.
My slicks are coming up on their 500 hour inspection, so I'm going to replace them one at a time over the next few months, with p-mags.
Michael-
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Michael Burbidge
Sammamish, WA
RV-14A Empennage
RV-9A Flying?340 hours!
Last Donation: December 2019
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12-28-2015, 01:31 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Make sure to install them exactly per the instructions (including grounding them to separate case bolts) and to put each P-mag on independent pullable breakers.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-28-2015, 03:55 PM
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Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 992
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Bill R question
Why pullable breaker? I have my Pmags on separate 5 amp fuses per B$C schematics.
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Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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12-28-2015, 04:04 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Larry DeCamp
Why pullable breaker? I have my Pmags on separate 5 amp fuses per B$C schematics.
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If wired per the Emag recommendation, you can drop power to them to test their internal generators. I had one go bad at 500 hours and the ignition never skipped a beat. The only way I knew it was to pull the power during my preflight.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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