EA-81 Pulses per second?

[Derek Anderson]

Any assistance on this would be appreciated.
I have a reconditioned EA-81 engine in my ultralight and am setting up the
digital instrument package (Strathomaster). In the instrument setup it has
pulses per ten for the engine revolutions (the wire goes to the coil), does
anyone know what this should be. I have contacted the supplier who does not
know and I have fiddled around with different settings but don't seem to get
any sense out of the thing. I currently have it set at 10:25 or that would
be 2.5 pulses to 1 revolutions (I think) I then get revolutions of 1,200
minimum and only as high as 3,400. If I reduce the ratio I get 800 to 3,000
and so forth. I know this is not a Sob group but know many of you have them.
Thanks in advance. Derek.au

[[email protected]]

Do you have a 2 or a 4 cycle engine and how many cylinders?

A 4 cycle engine normally fires each cylinder every other crankshaft
revolution however the ones that have one coil firing two plugs fires
every revolution. All 2 stroke engines fire each cylinder every
crankshaft revolution.
If you have a distributor where a single coil fires several plugs then
you get c/2 coil firings per revolution for a 4 cycle engine where c
is the number of cylinders.


On Sun, 4 Jan 2004 07:54:01 +1000, "Derek Anderson"
> wrote:

>Any assistance on this would be appreciated.
>I have a reconditioned EA-81 engine in my ultralight and am setting up the
>digital instrument package (Strathomaster). In the instrument setup it has
>pulses per ten for the engine revolutions (the wire goes to the coil), does
>anyone know what this should be. I have contacted the supplier who does not
>know and I have fiddled around with different settings but don't seem to get
>any sense out of the thing. I currently have it set at 10:25 or that would
>be 2.5 pulses to 1 revolutions (I think) I then get revolutions of 1,200
>minimum and only as high as 3,400. If I reduce the ratio I get 800 to 3,000
>and so forth. I know this is not a Sob group but know many of you have them.
>Thanks in advance. Derek.au
>
>