Pietenpol-List: No RPM drop on mag check??
Posted: Mon Sep 14, 2009 11:26 pm
Original Posted By: "Gene Rambo"
Hi all,I finally found a really great guy to go toolin' around with to burn off the 10 hours the insurance company is requiring.- We spent a fantastic 1.2 hours in N8031 last night.- Temps were perfect, wind was calm, and I even nearly greased my first landing in a Piet!- What a great night.Anyway, when I was doing the run-up I observed no RPM drop when checking the mags.- Whoa!- Something's a-miss.- "Off" works as advertised, so I don't think the mags are hot.Googling suggests the following:1. Open p-leads causing hot mags.2. Mag timing advanced beyond the specified setting3. Defective ignition switch4. Open in the grounding circuit of the feed through the capacitors (Bendix S-1200 series mags)5. Open magneto capacitors.I've got Eisemann mags, so I don't know if the Bendix specific warnings are applicable.Since it's affecting both mags, I'm leaning toward defective ignition switch.Anyone else have any other suggestions?Thanks,Dan-- Dan YocumFermilab- 630.840.6509yocum@fnal.gov, http://fermigrid.fnal.govFermilab.- Just zeros and ones.le, List Admin.=0A=0A=0A ________________________________________________________________________________
Hi all,I finally found a really great guy to go toolin' around with to burn off the 10 hours the insurance company is requiring.- We spent a fantastic 1.2 hours in N8031 last night.- Temps were perfect, wind was calm, and I even nearly greased my first landing in a Piet!- What a great night.Anyway, when I was doing the run-up I observed no RPM drop when checking the mags.- Whoa!- Something's a-miss.- "Off" works as advertised, so I don't think the mags are hot.Googling suggests the following:1. Open p-leads causing hot mags.2. Mag timing advanced beyond the specified setting3. Defective ignition switch4. Open in the grounding circuit of the feed through the capacitors (Bendix S-1200 series mags)5. Open magneto capacitors.I've got Eisemann mags, so I don't know if the Bendix specific warnings are applicable.Since it's affecting both mags, I'm leaning toward defective ignition switch.Anyone else have any other suggestions?Thanks,Dan-- Dan YocumFermilab- 630.840.6509yocum@fnal.gov, http://fermigrid.fnal.govFermilab.- Just zeros and ones.le, List Admin.=0A=0A=0A ________________________________________________________________________________