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Ignition control in a dual alternator dual bus system

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klehman(at)albedo.net
Guest

Posted: Mon Mar 03, 2008 10:23 am Post subject: Ignition control in a dual alternator dual bus system

I think you've misinterpreted something. I can't believe there are any 

electronic ignitions that advance so far as to reduce power and 

efficiency at any power setting when one or two of them is installed. If 

that were true then having two electronic ignitions would be worse than 

one. By all accounts one EI and one mag gives most of the benefit 

available from EI and is a winning combination.

Ken



 >snip

 > The problem with one mag vs.

 	  Quote: 	
		   one electronic is you give up horsepower and fuel efficiency when the

 timing is different.  The unit that has the most advance will fire first

 thus starting the combustion cycle early as it compares to the other.

 In most cases the mag will be the first to fire at lower power setting

 thus eliminating a retarded timing giving you better idle and starting.

 At takeoff power the electronic system will in most cases advance beyond

 the mag causing you the loss of power gained from the mag system during

 that period.

 

 Something to think about,

 

 Mike

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willslau(at)comcast.net
Guest

Posted: Mon Mar 03, 2008 4:06 pm Post subject: Ignition control in a dual alternator dual bus system

Electronic ignition systems will not cause a loss of power at takeoff power

settings, as they advance the timing at lower manifold pressure cruise

conditions, just like the vacuum advance mechanism did in automobile

distributors of days gone by. Fixed magneto timing is set for the worst case

situation - WOT. The engine will run much more efficiently with the timing

advancing incrementally as the manifold pressure (and thus BMEP) declines.



William



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