The primary supplier if the EI's in use in the experimental market is Klaus Sauvier and he refuses to provide anyone any data on the timing curves used in the LSE ignitions.  Without that, nobody can do a thorough analysis of them because they have no manufacturer's baseline to work with.  It's that lack of data that gives pause to the Ada guys recommending something they can't put on their test stand with hard data points. 

Skip,

 

We, the members of the LML, have the opportunity to fill in the timing data for the LSE.  I have some for the way I fly, but not all the points over a more complete power range.  Interestingly, we can calculate the Electroair numbers by referring to the CAFE article on EIs that identified the parameters and resulting timing function.

 

We could indeed form a spreadsheet for O, IO and Turbo engines from 320 to 360 to 550 at different power levels based on RPM and MAP, for single and dual LSE systems. Consider that the base timing is set to 20 degrees BTDC for CRs greater than or equal to 8.7 and 25 degrees for CRs lower than that (I believe the curve is the same otherwise).  The LSE site indicates other curves are available for Turbo engines.  Additionally, we could note the change in timing if only one of a dual LSE system is operating (partial failure mode).  Could I see the hands of those operating LSE ignitions with the display module?  Note also that the curves are "hard wired" for I read somewhere that LSE is not using any "computer" processing.

 

Perhaps when the weather is better, LSE Lancair users could gather at some central location and collect the data over a weekend, putting to rest the lack of information about the timing.

 

For now and for my engine, an IO 320 with a 9:1 CR Iridium auto plugs and mag gear timing sensors, I have verified that the timing agrees with a base of 20 DBTDC.  At various RPM, I will see a difference of .5 to 1.2 degrees between the two ignitions.  I usually report the earlier timing - the first to fire.  I don't know how accurate the LSE display is because of the difference between it and the VM EPI 800 engine monitor with respect to MAP and RPM with the LSE display being pretty jumpy.  Only the timing data comes from the LSE display.

 

For starters, here are some data points I stumbled on that were recorded last May, before secret airframe airspeed mods and over a rather narrow power range (I hope the text spacing holds up):

LSE DATA (5-15-05

 

Baro     Alt        Temp    IAS       TAS      MAP     RPM     CHT      EGT      Cyl       GPH Timing

30.00    5500     15C      165       182       23         2390                                         8.9        26.5

 

            6500                 178       197       25         2510     380       1300     4          10.6      25.0

                                                                                    370       1300     2

                                                                                    360       1280     3

                                                                                    370       1270     1

29.72    4600     14C      170       184       23.5      2350     360       1270     4          8.9        26.2
                                                                                    350       1270     3

                                                                                    350       1270     2

                                                                                    360       1250     1

 

29.72    3500     14C      162       170       21.2      2450                                         8.0        28.0

 

29.98    4500     13C      183       195       25         2510     370       1290     4          10.8      24.5

                                                                                    360       1280     3

                                                                                    350       1300     2

                                                                                    360       1280     1

 

29.96    9500     14C      168       198       22.1      2510     390       1290     4          9.2        27.0

                                                                                    370       1270     3

                                                                                    370       1290     2

                                                                                    370       1260     1

 

30.08    6500     15C      178       198       25         2500     370       1300     4          10.6      24.5

                                                                                    360       1290     3

                                                                                    360       1300     2

                                                                                    370       1270     1

 

30.08    8400     13C      170       195       23.1      2510                                                     26.5

 

Sorry about the missing numbers, writing is such a pain - I hope somebody out there automatically records engine data.