I am told that there is hardly any RPM drop switching from one to other EI during engine runup. There is a significant RPM drop with regular magnetos.
Wondering, what is the explanation?
Johan
So if you have two of the same engines, one fitted with dual standard magnetos and the other with dual EI, both engines with timing fixed at 25 degrees BTDC, will the EI still have much less RPM drop than the engine with magnetos?
The drop is based upon timing, so in this example they should be the same.
If that is true, then is the difference in RPM drop solely due to the "heat" or "energy" of the spark? I am keen to understand how the spark energy affects the rate of combustion.
Assuming that both sparks have enough energy to light the mixture, they will have the same combustion rate. It is true that some mixtures are harder to light and additional spark energy can overcome that relative to a weaker spark that would not light the mixture.
(It would seem that once the mixture is lit the rate of burn should be the same). Is there less increase in EGT switching from one to the other EI compared to switching between the magnetos?
How do fine wire aviation spark plugs compare to massive electrode aviation spark plugs if both are lit by a magneto?
I am asking out of ignorance hoping for better understanding.
Thanks.
Johan
So if you have two of the same engines, one fitted with dual standard magnetos and the other with dual EI, both engines with timing fixed at 25 degrees BTDC, will the EI still have much less RPM drop than the engine with magnetos?
If that is true, then is the difference in RPM drop solely due to the "heat" or "energy" of the spark? I am keen to understand how the spark energy affects the rate of combustion. (It would seem that once the mixture is lit the rate of burn should be the same). Is there less increase in EGT switching from one to the other EI compared to switching between the magnetos?
How do fine wire aviation spark plugs compare to massive electrode aviation spark plugs if both are lit by a magneto?
I am asking out of ignorance hoping for better understanding.
Thanks.
Johan
I only see a 30-50 rpm decrease on each of my slick mags and this has been the case for all 500+ hours I have on them, so I?m not sure that it?s always true that electronic ignitions will have lower drops. Perhaps it?s more a function of how clean the plugs are which may or may not always be a function of the type of ignition?