Crazy RPM [RESOLVED]

[mcr01passion]

I just finished to install the EMS on my Dyn'Aero MCR 01 VLA with a Rotax 912 (called Lafayette Sportster in USA), but during the engine test, I noticed a crazy RPM.
It seems to be ok till 3500 RPM, but just above it goes suuddenly to very high RPM, like 8000 RPM. In fact, the engine is running normaly, but the SkyView indication is wrong.

I searched several days what I made wrong, without success.

Do you have any idea?

 

[jakej]

Re: Crazy RPM

I'd try adding a 30K oHm resistor in series to the RPM signal wire, see how that goes as it can't 'hurt' but you may have to increase this value, up to 100K in 10K increments, to stabilise the RPM.

HTH

Jake J

 

[mcr01passion]

Re: Crazy RPM

I'd try adding a 30K oHm resistor in series to the RPM signal wire, see how that goes as it can't 'hurt' but you may have to increase this value, up to 100K in 10K increments, to stabilise the RPM.

HTH

Jake J

Ok, it won't hurt... I will try that. Thank you Jake. I will keep you advised...

 

[mcr01passion]

Re: Crazy RPM

I didn't get time to do it yet, but any comment from Dynon Support?

 

[dynonsupport]

Re: Crazy RPM

The resistor isn't typically needed on a 912, but it's standard procedure on a magnegoed setup. In short, it won't hurt things, as the previous poster suggested.

 

[mcr01passion]

Re: Crazy RPM

OK.... I tried the 30K ohms resistance and it works perfectly.

Thank you all...

 

[jakej]

Re: Crazy RPM

OK.... I tried the 30K ohms resistance and it works perfectly.

Thank you all...

There you go

Jake J