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  #11  
Old 03-03-2017, 05:50 AM
vic syracuse vic syracuse is offline
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Originally Posted by bob888 View Post
Thanks all. Second question for those with one electronic ignition and one mag...how much rpm drop is acceptable when the ei is cut out for a mag check? I'm seeing 150 rpm drop from 1700 rpm when I switch off the ei.

It will vary depending upon the mixture. Max allowed is 175 RPM, so 150 is OK and close to normal. Sometimes leaning will lessen the drop. The key is that the engine is still running smooth, which assures you that all of the cylinders are firing.

Vic
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Last edited by vic syracuse : 03-03-2017 at 06:32 AM. Reason: spelling
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  #12  
Old 03-03-2017, 05:57 AM
GregMac GregMac is offline
 
Join Date: Aug 2012
Location: Albany Western Australia
Posts: 54
Default Ignition question

I've got the same retard mag on the left like you Bob, with Lightspeed right. No Slick Start. I've started the IO540 for the first 12 mths (100 odd hours) with both left and right ignitions on. Have the same individual switchs, and have had absolutely no issues regarding kickbacks. I recently contacted Champion (Slick makers) their advice to me was that there was vertually no chance of the UNBOOSTED retard mag firering until the engine had reached started RPM, and then it would fire at the normal 25*. So because the unboosted mag was not contributing and the electronic was effectively doing all the starting then I should consider starting only with the electronic on, I've now adopted that routine and it's working well. Your RPM drops are consistent with what I'm seeing. Cheers from Western Australia
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  #13  
Old 03-05-2017, 06:13 AM
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Jesse Jesse is offline
 
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Originally Posted by vic syracuse View Post
It will vary depending upon the mixture. Max allowed is 175 RPM, so 150 is OK and close to normal. Sometimes leaning will lessen the drop. The key is that the engine is still running smooth, which assures you that all of the cylinders are firing.

Vic
...and if you can see all EGT's, if they all increase, all plugs are firing.
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