|
|
Ken Welter wrote:
Lehanover@aol.com wrote:
In a message dated 6/15/2007 9:35:51 A.M. Eastern Daylight Time, echristley@nc.rr.com writes:
One EDIS would be set to control the leading
plugs with a wasted spark, and the second would control the
trailing. It promises to be a very robust setup with multiple redundancies.
Don't forget that the trailing sparks must be distributed. Never fired at the same time.
Because there will be an apex seal between the two spark plugs, and destroy the engine.
Leading plugs in the lost spark situation, is no problem.
Lynn E. Hanover
That's why two EDIS ignitions are needed...running from separate vr sensors. The trailings sensor can even be offset by 5 or 6 degrees to give the trailing spark delay.
Do you know that you can dry fire the leading plugs but you cannot dry fire the trailing they must be only fired on the compression stroke.
Ken Welter
Dry fire <=> wasted spark....right? Again, that's why a second vr sensor and EDIS controller is required. This scheme adds the complication of a second EDIS, but the second one is independant of the first. Both will run at 10 degrees of advance if the computer fails. Adjust the vr sensor to give another 15 degrees, and the engine should fire at the right time even with the controlling computer on the fritz. If the computer and one of the controllers died, the remaining controller would continue to provide power...nearly full power if the trailing controller, and just partial if the leading. I could see myself switching to the standard spam-can's "left-right-both" switch to test the modules.
The computer provides a signal that modifies the advance for idle and high revs, but I've paid attention to Lynn. He's stated several times that the rotary will run fine with a static advance of 25 degrees. So loosing the computer would not mean losing ignition.
|
|