Well I have been using this motor in an Oriental full fuz model.
Has about 20 flights on it after running in on test bench,it runs
nice but has one problem,it bogs down rich after the recovery
to normal upright flight from the three outside loops,same again
in the last inside loop of the clover,its like fuel is pooling up in the motor
then tries to drown the plug the rest of the pattern is fine,Sig R/C glow
plug with idle bar,fuel is 11.5 % klotz,11.5% castor,3% nitro& remainder
methanol,11 x 5 Brodak smooth finish prop,have tried a number of hot plugs
same result release RPM about 9,100,uses 90cc of fuel for 6min 30 sec flight.
Still able to complete the pattern just a little worried about it stopping in the
climb out from the clover.
Randy any suggestions?
Thanks

Well I have been using this motor in an Oriental full fuz model.
Has about 20 flights on it after running in on test bench,it runs
nice but has one problem,it bogs down rich after the recovery
to normal upright flight from the three outside loops,same again
in the last inside loop of the clover,its like fuel is pooling up in the motor
then tries to drown the plug the rest of the pattern is fine,Sig R/C glow
plug with idle bar,fuel is 11.5 % klotz,11.5% castor,3% nitro& remainder
methanol,11 x 5 Brodak smooth finish prop,have tried a number of hot plugs
same result release RPM about 9,100,uses 90cc of fuel for 6min 30 sec flight.
Still able to complete the pattern just a little worried about it stopping in the
climb out from the clover.
Randy any suggestions?
Thanks

Hi Paul

What muffler setup are you running, and are you using pressure?
What type tank are you using and is it metal plastic uniflow etc?

Sounds like it could be not quiet broken in yet too, Tight motors will do that when coming out of a leaner setting when they need a little more break in time. To test that try holding the plane on the ground with a solid 4 cycle setting, turn the nose up and let it go into a 2 cycle for about 10 to 15 seconds then quickly put the nose back level, see if the motor stumbles. If so more time and a lower pitch prop with less load will help.
Also  I would use either a  T Bolt RC long , Glow devil 300 Long, Enya 3#  , T Bolt Big Bore  as very good plugs for that engine

let us know how it goes

Regards
Randy

Paul,

I have no experience with this engine, but I know these Enya Engines are r/c converts to c/l and seems to me that Enya timing targets best torque above 10500rpms. May be Randy can clarify the best RPM range to work with this engine.

With my SS30 and SS50 I didn't get spectacular performance with a 5 to 6 pitch props but when using 3.75 to 4.5 pitch..then it was Wow!

Based on my experience with other Enya engines, I guesstimate that a 7.5mm venturi and a 11.75x4 prop should pretty close to the sweet spot. Also I'd try one and two head shims to see how it would go.

The stock muffler on the SS30 which is the same as on the 40XZ worked pretty well and it is pretty light. Later I bore out the exhaust exit and smooth out the inside of the muffler. I didn't measure any performance improvement but I guess it made a difference, if anything it is running as good as before with less weight.

This is just my personal opinion for you to think about it and see if it is worth trying.

Martin

Hi Paul,


It seems the engine is telling us it needs to work in higher rpms to make the air/fuel mix flow faster inside the crank.

I believe a 40 size engine to be to small to work in 4-4-4 with an Oriental. I'd go for a 2-2-2 type run with it.


The APC 10.5x4.5 works well with in my Enya SS30, I'd expect the 40XZ to need the load of a 11.25x4 prop, at least.

In your shoes, I'd try to get the Engine set up (venturi size and head shims) to launch around 105000 rpms. I would start with an APC  11.5x4 prop or a CF prop 11.5~11.75 letting the light wood props for trying last.

Martin

Hi Seteve,

I am very familiar with both Oriental. The Enya 40XZ should be strong enough even for the Oriental Plus. What I meant is that running the 40 in the 4-4-4 mode it may not run strong enough. I could be wrong, but I believe this engine will develop a lot more torque in 2-2-2

Martin