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04-08-2012, 09:17 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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pmag timing .....
Today seemed like a good day to time my pmags. Per instrx I entered set up mode, after placing prop at tdc. My right pmag showed a solid red light, blew in tube twice now green......but my left pmag instead of a solid red it is blinking yellow while in set up mode..tried blowing in tube but won't turn green. Any ideas?
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Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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04-08-2012, 09:35 AM
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Join Date: Sep 2007
Location: WA
Posts: 988
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wiggle the prop...
move the prop slightly to see if the color changes... there is detailed discussion by Bill R on the forum.
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Stephen
RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop
with more hours flying than building... 2,430 on the hobbs!
ORCA Flight
Race 771
margarita!
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04-08-2012, 09:45 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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I moved the prop a little still blinking yellow. I read about that in the emag instrx. It spoke on this possibly happening after blowing in the tube. But in my case as soon as I went in set up mode the light was yellow blinking....never got a red led on the left as I did on the right.
__________________
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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04-08-2012, 09:49 AM
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Join Date: Sep 2007
Location: WA
Posts: 988
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try to time it by itself?
how about timing it by itself?
__________________
Stephen
RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop
with more hours flying than building... 2,430 on the hobbs!
ORCA Flight
Race 771
margarita!
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04-08-2012, 09:53 AM
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Join Date: Feb 2005
Posts: 426
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Maybe..
Maybe your p lead ground is not making a good connection. if I recall, set up mode is power ON with that P lead grounded.
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John Adams
Seattle
RV7 600+hrs
Paid 12/2014
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04-08-2012, 09:58 AM
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Join Date: Feb 2005
Posts: 426
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Ignition switch
Did you rewire your ignition switch so it will start on both P mags? Not sure if this would have the effect you see but maybe you made an error in setting up the ignition switch.
__________________
John Adams
Seattle
RV7 600+hrs
Paid 12/2014
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04-08-2012, 10:03 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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Tried Stephens first suggestion again and rotated the prop a qtr turn then the yellow light turned solid red..then I put the prop back and tdc blew in the hose...all good now. Thanks...
__________________
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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04-09-2012, 08:37 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by miyu1975
Tried Stephens first suggestion again and rotated the prop a qtr turn then the yellow light turned solid red..then I put the prop back and tdc blew in the hose...all good now. Thanks...
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My P-mag vacuum advance hoses come together in a Tee and when I set the timing, I blow in the Tee so they both get timed at the same time. If you are worried about them being slightly different, loosen one and turn it a "smidge" (technical term).
If you back the prop up and then turn it back, make sure it has taken up all the gear slop.
I have seen some people turn the prop past TDC and then just back it up to TDC, this is bad form. If you ?back up? the prop, turn it well past TDC and then bring it back to TDC slowly, stopping exactly at TDC. There is enough play in the gear train that you could be off a degree or two.
While developing the EICommander we discovered that there is a LOT of slop in our gear trains. Thus the minimum timing divergence we display is two degrees.
__________________
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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