ramrahq Posted April 23, 2010 Share Posted April 23, 2010 Hi. First of all great forum guys, just came across it when browsing around the web. My problem though is with my SP470 with 2200 motor. When I do my magneto checks the first one is fine drops about 50rpm but when n switch the second one off the rpm gauge goes to zero. The engine still runs fine and the rpm doesnt drop at all just the gauge. Can the gauge be wired incorectly. Thanks Link to comment Share on other sites More sharing options...
Tomo Posted April 23, 2010 Share Posted April 23, 2010 Has the problem just started? or has it been there since RPM gauge installation? Have you installed anything new lately? Ie, radio, new switch, new coil, mag's etc... To me, what's is happening is when you switch the Mag off, you open circuit (turn the signal off) to the RPM, thus Zero RPM, but for that to happen, it's wired up wrong. Have you touched it recently? Link to comment Share on other sites More sharing options...
hfrensch Posted April 24, 2010 Share Posted April 24, 2010 Jabiru took the RPM signal of one coil for the tacho on one of their models some time ago, I am sure thats your problem not a major problem as you should hear the engine run rough during mag check. Can be changed by adding a pick up and plates to flywheel and reset the tacho. Cheers Helmut. Link to comment Share on other sites More sharing options...
ramrahq Posted April 24, 2010 Author Share Posted April 24, 2010 Thanks for the replys. I recently baught the plane but didnt notice this when I test flew it. They added a transponder with the last service, this might be where things went wrong. Link to comment Share on other sites More sharing options...
Guest 4aplat Posted April 26, 2010 Share Posted April 26, 2010 Hi.First of all great forum guys, just came across it when browsing around the web. My problem though is with my SP470 with 2200 motor. When I do my magneto checks the first one is fine drops about 50rpm but when n switch the second one off the rpm gauge goes to zero. The engine still runs fine and the rpm doesnt drop at all just the gauge. Can the gauge be wired incorectly. Thanks Hi it depends of the gauge and the sender If the info come from the magnetic sender on the flywhell you're not supposed to go to zero (this kind of sender is independent from the magneto) If the info comes from the alternator --> same thing If the info comes from the magneto (ex mgl gauge) you will have to make a modification on your wirering loom Michel (there is the schematic somewhere in my forum) Link to comment Share on other sites More sharing options...
ramrahq Posted April 28, 2010 Author Share Posted April 28, 2010 Hi Michael. Thanks for your reply. Any idea of where I can find the scematic? Link to comment Share on other sites More sharing options...
Guest 4aplat Posted April 28, 2010 Share Posted April 28, 2010 http://jabiru-owner.com/images/pdf/magneto.jpg B1 and B2 are the 2 magnetos CT is the gauges in the middle the 2 switches Link to comment Share on other sites More sharing options...
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