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04-04-2015, 07:48 PM
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Join Date: May 2005
Location: Lincoln, NE
Posts: 73
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GRT EIS 4000 tach source
I'm preparing to install a GRT EIS 4000 for my Lycoming O-360 (slick mags). For the tach, the instructions suggest installing a toggle switch to allow you to select a mag for a tach reading.
Is this there a better way to do this without a toggle switch?
Doug
RV-7
Firewall Forward
Last edited by doug_rv7 : 04-04-2015 at 08:00 PM.
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04-04-2015, 09:27 PM
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Join Date: Aug 2009
Location: Southern California
Posts: 877
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Upgrade It
Quote:
Originally Posted by doug_rv7
I'm preparing to install a GRT EIS 4000 for my Lycoming O-360 (slick mags). For the tach, the instructions suggest installing a toggle switch to allow you to select a mag for a tach reading.
Is this there a better way to do this without a toggle switch?
Doug
RV-7
Firewall Forward
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Send it to GRT and get it upgraded to the latest revision. The newer versions of the EIS have inputs for P-lead signals from both mags which makes for a much cleaner set up than having to use a toggle switch to switch between the active mags during run up.
Skylor
RV-8 |
04-04-2015, 09:57 PM
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Join Date: Feb 2005
Location: Bay Pines, FL (based @ KCLW)
Posts: 1,955
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I've been using the toggle switch for 9 years. Not a big deal.
IMHO 
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Danny "RoadRunner" Landry
Morphed RV7(formally 7A), N20DL, PnP Pilot
1190+ hours
2019 Donation Paid
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04-05-2015, 06:28 AM
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Join Date: May 2005
Posts: 502
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Toggle Switch is no biggie
Like Dan, I've been using mine for 6 years. It becomes second nature during the run up.
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Carl Raichle
Lutz, FL
RV-9A N194CR
RV-14A Under construction
Based at KZPH
AA4SR
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04-05-2015, 06:34 AM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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And I have the upgraded version, it too works quite well.
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RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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04-05-2015, 07:44 AM
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Join Date: Jan 2005
Location: Ruston, Louisiana
Posts: 878
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No switch
I don't even have a switch!
Right mag shows Zero during mag check.
I can tell what I need to know by feel and sound.
Not trying to sound smart, it's just not an issue.
Mark
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Mark Burns
Ruston, Louisiana
RV-7A N781CM 1,650+ hrs
FFI FL-24
A&P
Last edited by Mark Burns : 04-05-2015 at 02:54 PM.
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04-05-2015, 09:56 AM
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Join Date: Feb 2005
Location: Leawood, KS
Posts: 275
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Hall effect sensor
You can add a hall effect sensor from Aircraft Spruce. It plugs into the vent hole on one of the mags. It senses the magnet spinning in the mag so it doesn't care if the mag switch is on or off. I ran this on my engine when I had one mag and one Lightspeed
Andy
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Andy Cobb
RV-7A
MO00 & KLXT
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04-05-2015, 11:58 AM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 999
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Another choice, Vans sells a transducer to drive their brand of tach, bolts to accessory cover.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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04-06-2015, 05:57 AM
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Join Date: May 2005
Location: Lincoln, NE
Posts: 73
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Great, thank you all for the feedback.
Doug
RV-7
Firewall Forward
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04-06-2015, 07:43 PM
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Join Date: Dec 2005
Location: Sydney, Australia
Posts: 427
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Initially I used Vans transducer, it should have worked nicely but was problematic from the start, failing within the first few hours; I think because the tacho drive 'pin' supplied was just a bit too long. Somehow this damaged the sender and eventually pushed the back cover off the transducer. I also had some problems with the appropriate pulse per revolution ratio to use - so either I damaged the transducer from the outset or the signal did not play well with my early version EIS. Reverting to the tacho single p-lead sensing worked perfectly except of course during the mag check.
I did have GRT upgrade the unit primarily to resolve a configuration issue. This turned out to be a major refresh in hardware and software at a very modest cost. The dual p-lead sensing was a welcome bonus.
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Doug Gray
RV-6 completed, flying since July 2010
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