Posted for John Huft <aflyer@lazy8.net>:

 Well, Walter, if you look at my entire post...
 
 
 "On my normally aspirated engine, the LSE does not advance timing at all for
the case of full power (i.e. 2700 rpm and > 26 in. Hg. manifold pressure). So,
I would not think the advance curve comes into play in a full power run on the
dyno. I doubt that the stronger spark causes a power loss."
 
 
 You see, I just said that there was no timing change at > 26" MAP, so, then,
a stronger spark is not going to cause a power loss.
 
 Obviously, if you change the timing, you change everything.
 
 In my airplane, I have the digital display readout of the actual timing
advance provided by the LSE. So, I can watch what it is doing at different
power settings. With ram air at low altitudes, I have seen 31" MAP, and from
there down to at least 26, the timing remains at baseline (for my engine, 20
degrees BTDC), even at high RPM. I can't say what it would do at 40" MAP, that
is a question for Klaus.
 
 John
 
 p.s. Yeah, I did some dumb things during my high school hot-rodding days, but
then, I still do :o)