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MGL digital tach on an M-14

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waltmurphy

Joined: 01 Dec 2007
Posts: 18

Posted: Wed Apr 03, 2013 5:47 am Post subject: MGL digital tach on an M-14

Does anyone have any experience in installing an MGL digital 

tach/manifold press gauge in an aircraft with an M-14?

The installer added resistors and trimmed the instrument but it's still 

not correct...close but maybe 150 RPM off compared to a strobe tach on 

the prop.

Any info on the correct resistor or ?? Would be most helpful



thanks,

Walt Murphy

Reno

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rmhou(at)yahoo.com
Guest

Posted: Wed Apr 03, 2013 7:38 am Post subject: MGL digital tach on an M-14

No experience with MGL, but my GRT EIS connected to mag switch on a Huosai works great. Strobe each on your prop measures prop rpm. Digital tach connected to mags measures engine rpm. You need to account for gear reduction to verify both measurements.

                                                                                                                                                                                           From:                                                          Walt Murphy <waltmurphy(at)charter.net>;                            

                                                              To:                                                           <yak-list(at)matronics.com>;                                                                                                     

                                                              Subject:                                                          MGL digital tach on an M-14                            

                                                              Sent:                                                          Wed, Apr 3, 2013 1:44:39 PM                            

                         

                             

                                                                                                                                                                                                                           

                 

             

  [quote][b]

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gill.g(at)gpimail.com
Guest

Posted: Wed Apr 03, 2013 9:18 am Post subject: MGL digital tach on an M-14

I use their tach  and it is accurate.  It could be that it needs to be

programmed for the correct pulse count.  The guys at MGL are always very

helpful.



Gill



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wlannon(at)shaw.ca
Guest

Posted: Wed Apr 03, 2013 7:05 pm Post subject: MGL digital tach on an M-14

Walt;



As Robin has noted you need to take the gear ratio into account when 

comparing engine to prop RPM.



For the M14P the gear ratio is 0.658.  For the Huosai it is 0.787.    At 

2900 engine RPM the M14 prop is turning at 1908 RPM.  At 2350 engine RPM the 

Huosai prop is turning at 1850 RPM.

Hope that helps.



Walt

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Apr 04, 2013 5:11 am Post subject: Re: MGL digital tach on an M-14

I have an MGL tach on a Housai. The correct pulse setting is important and there are settings to fine tune it. Quite honestly I never use it. (hobbs use only) I use the analog gauge and can read that better. Does MGL make one that looks at both Mags now? if not, don't bother with it.

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N13472(at)aol.com
Guest

Posted: Thu Apr 04, 2013 9:36 am Post subject: MGL digital tach on an M-14

The  resistor is for setting the signal level into the tach so as to not over or

under drive the pulse detector circuit. If the tach is reading Rpm at all the resistor

should have no effect on the accuracy of the reading.

Tom Elliott

CJ-6A NX63727

777 Quartz Ave

PMB 7004

Sandy Valley NV

89019

Cell 541-297-5497

N13472(at)AOL.COM





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