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05-21-2015, 06:54 AM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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pmag power question
I am experiencing a slight power loss with the 1 pmag/1 slick mag combo.
Have checked timing on the slick and the pmag. Slick is at 25 degrees BTC and pmag set at TDC. I was able to see 150 ktas with two slick mags, now I am only able to get 146 ktas after testing for a couple of hours. I am running full power. I checked rpm drop in flight and got an 80 drop on the slick and a 50 drop on the pmag. Trying to understand the timing advance with the pmag but not sure if that is my problem. What other tests or factors should I be thinking about?
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05-21-2015, 06:58 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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Are you running the "A" or "B" advance curve on the Pmag? How is the MP tube attached?
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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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05-21-2015, 07:05 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Toobuilder
Are you running the "A" or "B" advance curve on the Pmag? How is the MP tube attached?
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The "A" curve is what you should be running and requires a jumper between pins 2 and 3.
Also confirm that all your plug wires are seated properly.
Did you check the plug gaps before installing them?
Do you have a restrictor in the MAP line to smooth out the pulses?
__________________
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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05-21-2015, 08:09 AM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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pmag
Have checked that plug wires are firm and seated properly.
Plugs were gapped at .030 prior to installation.
Manifold pressure is taken from number 2 cylinder primer port. The only place that was possible to get a fitting. I had a primer line on that port and just used same tube line but cut, for the mp
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05-21-2015, 08:12 AM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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pmag
Using A curve
No restrictor on MP
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05-21-2015, 09:29 AM
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Join Date: Oct 2012
Location: Corona , Ca
Posts: 138
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Map restrictor
MADE A MISTAKE ON SIZE PULSATION-DAPANING SNUBBER. ORFICE ."004"
I believe I have a spare 1/8 male/ female restrictor ".020" from McMaster Carr. Will be at airport shortly to check. Sells for about $9 Will ship for $8. If interested text me at 714-501-1310
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RVTOY
RV7A flying
Kitfox 7 completed 2009. Lost in 2010 KJOA Flood. New Airworthiness cert. 6/8/2018
Always an upgrade in progress.
Donated to keep forum alive.
Last edited by RVTOY : 05-21-2015 at 02:01 PM.
Reason: Mistake in information
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05-21-2015, 10:50 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by rwarre
Using A curve
No restrictor on MP
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It is possible that your timing is bouncing around with the MAP. Any chance you can put a restrictor in and report back?
The fitting mentioned above, a lawnmower fuel filter, or a drilled rivet should work.
__________________
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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05-24-2015, 04:02 PM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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fixed
I installed a rivet with a .025 hold drilled in it. Seems to have fixed the problem. The power is back to more than with two slick mags. Now I just have to get used to flying with EI.
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05-24-2015, 06:22 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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That's good news!
At your next condition inspection, I recommend you open the plug gaps up to .032. (The range is .030 to .035.)
The larger the gap, the easier it can ignite leaner mixtures.
__________________
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
Last edited by N941WR : 06-07-2015 at 06:44 AM.
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05-24-2015, 07:29 PM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,034
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Quote:
Originally Posted by N941WR
The fitting mentioned above, a lawnmower fuel filter, or a drilled rivet should work.
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How do you install a lawnmower fuel filter to do the damping? Aren't they one way devices or does it matter?
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Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
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