Dear All,

I have purchased this new Enya engine through Alberto Parra in Las Palmas (cheap and easy way to purchase this Engine in Europe) and bench tested and flight tested this motor.

On the bench I used the stock muffler with the internal baffle. I ran several tanks with an Eather 2-blade 11.5x5 UC carbon prop which is my standard prop with my ST-51's. In direct comparison with the ST-51 this Enya turned this prop at 9,800 rpm vs. 9,500 rpm with the ST-51. This was in fast 4-cycle mode as I would set on the ground before launching the plane. Thus, the Enya seems to be a little stronger than my ST-51. Both had 7.5mm venturies and expansion type mufflers with a short silicon deflector and 5% Nitro all synthetic fuel.

In my plane the Enya behaved much differently. With stock muffler and same prop the flying speed was too slow although the engine ran in fast 4-cycle. I removed the internal baffle from the stock muffler but it didn't improve the situation. I was disappointed first.

I then installed another muffler made from simple aluminium tube with 1" internal diameter and 5"length. Due to the stupid mounting holes dimensions no standard mufflers fit and I had to machine a muffler myself. The exhaust tube is 9mm internal diameter. I connected a short silicon deflector.
I also put on an Eather 13x5 UC 2-blade prop and set 8,600 rpm on ground in slow 2-cycle.

Once in the air the engine ran very nice in fast 4 cycle and switches into 2-cycle in the overheads. Because the engine is fairly new and I used all synthetic fuel the motor had problems going immediately back into 4-cycle in diving manouvres. I hope this improves with run time. If not I will try half castor, half synthetic to cool the engine better.
I tested the stock muffler without baffle again but the power was lost again although muffler volume and exhaust diameter seemed to be fairly the same. Ergo: I cannot recommend the stock muffler, not even without baffle. Not only is it heavy but also very loud.

It seems that compared with an ST-51 the Enya is much louder. Many ABC or AAC engines are louder than ringed engines. I remarked the same with my side exhausted RO-Jett BSE 61 or Henk de Jongs Eli Rozenberg AAC 61 engine or Uwe Degner PA-61 on expansion muffler.

To conclude: The muffler seems to be critical with the Enya 61 CXS. It is not this user friendly in this respect as the ST-51 but has lots more torque although the stroke of both engines is the same. This surprised me but since I was looking for an engine capable of swinging a bigger prop I think I have found it.

The Enya uses about 5 ounces of fuel for the pattern which is one ounce more than my ST-51's. As I said, the engine still heats up in outside manouvres and not immediately comes back but I think I can improve this with castor in the fuel and/or more run time.

I am still not this convinced that I would buy immediately another Enya 61 CSX Pro but the performance is very promising. It starts easily with flipping the prop backwards against top dead center. What I remarked while choking is that it draws lots of air through either the front bearing or from elsewhere. When closing the venturi and choking you can hear that it draws air from some way (perhaps though the depressurization boring from front bearing to venturi). Once in the air I haven't remarked any problems. The front bearing doesn't leak fuel, the engine stays dry.

The mounting holes are eays to modify to allow putting this engien in planes for the ST-51. The engines weighs one ounce more but this can be accepted.

Christoph Holtermann (Germany)

Prueba Avanzada por Christoph Holtermann (Alemania)

Advanced Engine test by Christoph Holtermann (Germany)

Prueba Avanzada por Yves Fernandez (Francia)

Advanced Engine test by Yves Fernandez (France)