EFIS/EMS Use with Auto Conversions?

[Chris in Marshfield]

Good evening,

Is the EMS designed more for use with traditional aircraft engines, or are there accommodations for monitoring liquid-cooled engines as well, i.e. Subaru, Mazda, Rotax, etc.? And if auto conversions are applicable, and EFI is in use, is fuel flow measurable through injector duty cycle, or is the flow meter the preferred method?

I appreciate your input.

Best regards,
Chris

[TrutrakTech]

Good evening,

Is the EMS designed more for use with traditional aircraft engines, or are there accommodations for monitoring liquid-cooled engines as well, i.e. Subaru, Mazda, Rotax, etc.? And if auto conversions are applicable, and EFI is in use, is fuel flow measurable through injector duty cycle, or is the flow meter the preferred method?

I appreciate your input.

Best regards,
Chris

Our EMS systems are factory installed equipment on several LSAs using Rotax engines so that's not a problem. At this time we do not have an input for an engine coolant temperature sensor.

For fuel flow, we'd have to use the Floscan transducer. There is no provision for measuring IDC. Thanks!

[michel elkoubi]

Using only one flow transducer you do not control the return flow( that was also my concern on the specific thread I write) so how can we sure to read the exact flow?
this exact flow is the difference between "in" fuel and "out" fuel from the engine!!! How can we check this ? on the Rotax the return from carbs is low but in injection car engine this flow is consequent !

[TrutrakTech]

Using only one flow transducer you do not control the return flow( that was also my concern on the specific thread I write) so how can we sure to read the exact flow?
this exact flow is the difference between "in" fuel and "out" fuel from the engine!!! How can we check this ? on the Rotax the return from carbs is low but in injection car engine this flow is consequent !

You'll want to place the transducer between the pressure regulator and the engine, you should be reading the actual fuel consumption of the engine. The pressure drop through the transducer is negligible. This would negate the need for a two transducer system and also negate the need for subtracting the return flow from the inbound flow.

[michel elkoubi]

thanks for a so quick answer!!
Oups no way!!!!!! the pressure regulator is directly fitted in the injector manifold there is no possibility to reach this flow (exceped if the engine manufacturer do this alteration)
In France one builder is using same engine but in a different plane and using a "Dynon" ems So if they do it !!! we will be able to do it also !!!!!!Trutrack being the best one !!!!!

[Chris in Marshfield]

Using only one flow transducer you do not control the return flow( that was also my concern on the specific thread I write) so how can we sure to read the exact flow?
this exact flow is the difference between "in" fuel and "out" fuel from the engine!!! How can we check this ? on the Rotax the return from carbs is low but in injection car engine this flow is consequent !

If you don't mind measuring fuel flow with a device outside of the EMS, Matronics has a fuel flow measurement device that utilizes a return flow transducer to calculate the difference.

http://www.matronics.com/

It's a nice, clean-looking device.

Best regards,
Chris

[Chris in Marshfield]

Our EMS systems are factory installed equipment on several LSAs using Rotax engines so that's not a problem. At this time we do not have an input for an engine coolant temperature sensor.

For fuel flow, we'd have to use the Floscan transducer. There is no provision for measuring IDC. Thanks!

Thanks for the insight, Lucas. The more I look at your EFIS/EMS, the more I like it. Am I correct to assume that there is no air data system? It's all attitude and GPS derived? Or do I need to take another look at the documentation? :rolleyes:

Thanks and best regards,
Chris

[Chris in Marshfield]

Oops... Guess I should have done some more research before I asked that question. Of course there's air data. Says so right in the manual ;)

Thanks and best regards,
Chris

[TrutrakTech]

thanks for a so quick answer!!
Oups no way!!!!!! the pressure regulator is directly fitted in the injector manifold there is no possibility to reach this flow (exceped if the engine manufacturer do this alteration)
In France one builder is using same engine but in a different plane and using a "Dynon" ems So if they do it !!! we will be able to do it also !!!!!!Trutrack being the best one !!!!!

Dynon uses the same fuel flow transducer that we do, so the setup for their EMS will be basically the same for ours. Check the placement of the transducer on that aircraft.