Sky2high@aol.com wrote:



In a message dated 1/9/2008 8:11:07 P.M. Central Standard Time,  walter@advancedpilot.com writes:

I cannot honestly give more details for two reasons, 1) I don't know them  all, and 2) This was an R&D run on a NA TCM engine set up like TCM wants  it set up with only the one difference of advancing the timing 2 degrees.  The resultant ICPs were 1130-1140psi and it was not at max power or at  max ICP mixture!  It could easily have been made worse--and it wasn't  even TC'd.


My point, Scott, is that we see folks diddling with timing changes who  have no hard ICP data--only what they *think* will be the result or some  *calculation* and we now know, from hard data, that that decision tree in this  instance could be flawed--with nasty results.  Some of the guys who who  have seen this data and were common choice builders of engines for the exp.  market will no longer build/warrant an engine on which the owner plans to use  EI.  I find that telling.


My current position on EIs is that the jury is still out on what's being  done by some folks who are doing so without hard ICP data--and as far as I can  tell, that's most of them.

Walter,
 
Fine.
 
A good example of your point is LASAR.  Whatever method they used  to arrive at their secret timing curve for a carbureted Lyc 360 in a C172  sure didn't work very well when installed and used on an injected 320 with a  higher CR.
 
Another example might be the EMAG/PMAG group.  When I first considered  their equipment they had very limited experience with any variety of  engines.  24 software changes indicates they may be getting much needed  experience.  Perhaps that is why they allow the user to alter the  timing.
 
The dual Light Speed Engineering Plasma III (sustained spark) has  worked quite effectively for me.  I do not know about any other  engine.  While I could "adjust" the timing, I have no interest in doing so  because I don't think I could improve anymore on the engine operation and I sure  could easily harm it or just make it worse...
 
Scott Krueger  AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Pilot  not TSO'd, Certificated score only > 70%.



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