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From: George Braly <gwbraly@gami.com>
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Subject: RE: [LML] PRISM vs FADEC [again] was: leaning during climb
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Rob writes:

>>also PRISM does not do mixture, so it offers protection (retards
timming) as you find best power or economy but will not find it for you. <<

Well.... not exactly.

Here is the issue.  Compared to the traditional continuous flow port
injection systems - - NOBODY - - has been able to point to any performance
enhancement for any internal combustion engine operated with pulsed
sequential port injection in an application where the engine operates for
extended periods of time at constant power with the RPM at or above 2000
RPM.

Does that sound like an airplane engine?   

If you can think of any performance advantage, please speak up!

So... why do it?   Just for the engineering challenge?  Just to add 10 lbs
of wiring and a couple of 50 pin connectors?  Just to add a half dozen new
failure modes and  thousands of lines of software code to be certified?  And
re-certified every time you make a change in the "map" of the F/A ratios ?

PRISM - - CAN do it. In fact, PRISM can do it much better than it is
presently done in the automotive world.

All the hooks are there in the hardware and the software to run it...    but
**WHY** ? ?

Regards,  George