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Old 05-16-2018, 12:38 PM
cropdusterdave cropdusterdave is offline
Join Date: Mar 2005
Location: Fargo, ND
Posts: 143
Default Skyview RPM setup question

Hey folks,

I've been working on getting my RV-7 dialed in and am having a small setup issue with RPM. The indication is way off on the low end. Displaying only about 1700 RPM static at WOT. When I check mag drop...the rt mag only drops 50 or so. However, the lt mag indicates a drop of like 500 rpm...which it is in reality not doing. Thinking I was going to have to mess with resistors, but I started to go through the book and I may have missed one thing. My pulse/revolution settings are off I believe. pins 32 and 34 have a value of 1.5 and 33 and 35 have a value of 3.0. I believe these are supposed to both be set to either 1 or 2. It is my understanding that the lycomings put out two pulses per revolution.....but only the positive is used for rpm? So 1? If it sounds like i'm's because i'm clueless.

Setup is a Lyco O-320 with two magnetos. Any advice on the settings?
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Old 05-16-2018, 01:17 PM
Raymo's Avatar
Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,849

You should have a resistor installed on each P-lead to the EMS and use 2 pulses per revolution for a 4 banger. The Dynon will use the first RPM sensed from mag that comes online. When doing a mag check, it will use the last mag it senses.

EDIT: You should be using pins 32 and 33 for mag RPM, per the install manual.
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Last edited by Raymo : 05-16-2018 at 01:26 PM.
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Old 05-16-2018, 03:12 PM
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Jesse Jesse is offline
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,646

What Raymo said. You should have a 30k or higher resistor in-line with the wire going to the p-lead.


Set both at 2 PPR and use the pins recommended and you should be good to go.
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Old 05-16-2018, 09:30 PM
cropdusterdave cropdusterdave is offline
Join Date: Mar 2005
Location: Fargo, ND
Posts: 143

Thanks for the help. Hopefully this is a quick and easy fix!
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