Martin....I've got over 100 flights on mine in a T Rex, SV11...pipe lenght is 17.25, majik 3 blade 12.5 x 3.8, 6.0 mm venturia with bruline filter, 5 % sig fuel, launch rpm 8900.It's been flown at the KOI, huntersville,Cole contests and not many could tell it was an ENYA...thought it was a PA because I swap back and forth quite often.Right now it's in a P40 profile with pipe...Jimmy

The 6.0 is a factory part...got 4 sizes from ENYA and some head gaskets about a year ago with the motors.Using 6.5 ounces to do the pattern with the SV11.Pipe is a randy quiet pipe.   Jimmy

My 61 CX RE (muffled with Randy's header and tube muffler) came with a 7.5mm venturi which I used when running in but I swapped it out for the 8mm from my 60-IIIB for flying in an SV-11. If I'd known about it at the time I would also have ordered the optional high compression head button, which I believe is standard on the RC version, because I use FAI fuel. The head button on mine has a small dimple near the glow plug which I can only assume indicates the low compression head.

Hi Jimmy,

Sorry that I missed seeing you and the plane at Huntersville!  Sounds like the Enya and pipe set up is a good one. 

What differences do you see between the Enya and the PA .61?

Bill

I started testing the 61CX RE with  SV-11 ARF. I have no experience running  pipe engine and hope some of you pipe expert can help me a bit here.

I am using initially this setup
B.E. #7 Pipe at 18.5"
Enya 3 Plug
Venturi: .315 (8.0mm)  with Bruline green element
Prop:  Bolly 13x4.5 repitched to 4" at station 8 and 3.8" @ 13
Fuel Byron Traditional 10% Nitro 20% Oil
Lines:  69' C2C
Launch at around 10k rpms
5.1s laps

I  fill the 6.0Oz Tank up and get about 5.0 ~ 5.5 minutes running.

Engine run most in 2 when maneuvering and goes to 4 in level flight.  It is charging a bit when maneuvering so I believe I need to move the pipe further.

In the H8 it is not running perfectly symmetric, slightly rich on the inside and slight leaner on the outside.  What are the possible fixes to make a more even run? I thought with a pipe this would not happen at all.

Which way it goes towards a 4-4-4 run?

- smaller or larger venturi
- more or less head compression ratio
- longer or shorter pipe 
- Colder or Hotter Plug   

I notice that when I change the Enya 3 Plug to an Enya 4 Plug the 4S was more present and a deeper sound.

What would do in my shoes, focus in obtaining 2-2-2 or 4-4-4 type run?

Martin

I started testing the 61CX RE with  SV-11 ARF. I have no experience running  pipe engine and hope some of you pipe expert can help me a bit here.

I am using initially this setup
B.E. #7 Pipe at 18.5"
Enya 3 Plug
Venturi: .315 (8.0mm)  with Bruline green element
Prop:  Bolly 13x4.5 repitched to 4" at station 8 and 3.8" @ 13
Fuel Byron Traditional 10% Nitro 20% Oil
Lines:  69' C2C
Launch at around 10k rpms
5.1s laps

I  fill the 6.0Oz Tank up and get about 5.0 ~ 5.5 minutes running.

Engine run most in 2 when maneuvering and goes to 4 in level flight.  It is charging a bit when maneuvering so I believe I need to move the pipe further.

In the H8 it is not running perfectly symmetric, slightly rich on the inside and slight leaner on the outside.  What are the possible fixes to make a more even run? I thought with a pipe this would not happen at all.

Which way it goes towards a 4-4-4 run?

- smaller or larger venturi
- more or less head compression ratio
- longer or shorter pipe 
- Colder or Hotter Plug   

I notice that when I change the Enya 3 Plug to an Enya 4 Plug the 4S was more present and a deeper sound.

What would do in my shoes, focus in obtaining 2-2-2 or 4-4-4 type run?

Martin

   No idea on the last one. Do you know the exhaust duration of the engine?

    Brett

""Engine run most in 2 when maneuvering and goes to 4 in level flight.  It is charging a bit when maneuvering so I believe I need to move the pipe further.""

No I would try this first, the 18.5 to 19 inch is the right range but you should either drop nitro to 7.5 or 5% and run it as is or  run 10 to 15% nitro but back the needle out to a deeper 4 cycle where it will just beep 2 cycle in the tops of the manouvers, If the plane is too slow put the prop pitch back where it was before you  depitched it
Use the #4 in the hot summer months and the #3 all the rest of the year

Regards
Randy

I tried a mixture of 5% nitro and 25% Oil, but it didn't make much difference except the engine sounded differently. Tried a few plugs no difference also.

Move the pipe to 19", hard to notice any change. It still charges when maneuvering no matter if I launch richer (5.4s laps) or leaner (4.9s laps), it goes faster on the outside loop of the H8 and slower on the inside. But the weird thing is that it gets richer after the 3 outside loops, and if I start with 5.1s laps  it goes richer to 5.3s laps after the outside loops.

I intially setup the tank height lower then the NVA, about 1/8 and to fix the asymmetric during H8 I shimmed with another 1/8 piece, but no change it did exactly the same thing.

I just thought tonight that perhaps ONE of the sources of my problems could be fuel foaming. I used a hard L shape C.Fiber piece that bolts on the engine mount to secure the tank, will look into that when I have a chance and try a different fuel tank.  BTW, my fuel system was check and tripled check for leaks.

I noticed that this Enya 61CXRL with pipe is vibrating quite a bit more then my Enya 61CX SE with muffler and using the exact same prop. Does pipe increase engine vibration?

Will try to replicate Jim's setup when I have a chance.

Any suggestions is appreciated.

Martin

Hi Pete,

thank you for your reply. Well as matter of fact I have tried a smaller prop already. I just noticed that I miss to write "3Blades" on my setup,  I am using a Bolly 13x4.5 3 Blades prop repitched to 3.8 at the tips. When I tried the APC 13x4 the engine charged a lot more, with the Bolly the engine behave a lot better, but still  far from keeping the air speed as good as my other engines. I thought a tune pipe would govern the rpms no matter what engine, but  that aint happening here so far.

Martin

HI Martin,

A couple of drops per gallon of Armor All WILL kill the fuel foaming.  Don't use more than a couple drops as more will cause deposits on the plug coil.  With just two or three drops in a gallon, you can shake the gallon real hard and there is no foam.

Never had , or even seen, the Enya 61CXRL yet, so I hope you get the problems squared away.

Big Bear

I was able to reduce a lot of the foaming problem  padding the fuel tank but it still hunting me.

What's the scoop with Armor All? I read some where that they changed the formula sometime ago and the new stuff is not as good as the old one.

Martin

Easy enough to test: Put some fuel in a clear container, shake, note foam content. Same Container, same fuel, add one drop Armor all, repeat test and note foam content-there may not be any. If I use it (very seldom) but 2 drops per gallon usually does the trick. 

I got the engine running quite well now. The foaming problem was almost eliminated padding the tank with Styrofoam and foam all around it.

I chosen to setup it up in in 2-2-2, and this is where I am now

Venturi: Stock 7.5mm
Tank Height:  Shimmed 0.5" from NVA
Pipe: 19.0" to 19.5"
Prop: Brian Eather 13x3.75 3 blade repitched to 4
Launch RPM: 9700rpms
Laps:  5.4s
Lines: 69' C2C
Fuel : Byron 4T YS 20/20 Mixed to bring formula around  10% Nitro 10% Sinth  14% Castor
Fuel Consumption: around 5.5Oz

Engine run a solid 2-2-2 and that slow motion feeling is happening. Last contest it was pretty windy and engine worked very well holding up the speed.

Martin

Just to make things clear,  the tank is shimmed so the uniflow end is about .5" from NVA. Looking the model upright the uniflow is .5" below the NVA.

Martin

Good to hear about your success with the Enya.   I expect to be making 1st flights this weekend with my arc SV-11/Enya61RE.   My tank is set up with uniflow at same height as NVA, and only 1/8 adjustment up or down.  If mine is same as yours I would have to open tank and move u-flow tube.   

Use a bubbe Jett tank? (http://www.jettengineering.com/)

Would definitely stop the fuel foam issue dead in its tracks but don't know how applicable they in CL stunt.

Hi Chris,

Thanks for the idea,  gotta try one of those some time.

Martin

From the Armor All web site

"Armor AllŪ Original Shine Protectant contains water-based silicone emulsions, surfactants, and ultraviolet light inhibitors, humectants, dispersants and gloss enhancers."

The only problem with the Bubble-Jett tanks is that you can't use Uniflow. It'd definitely stop any foaming though .

Hi Brian,
            the loss of any uniflow set up is kind of irrelevant since the pressure on the bubble should be fairly constant and since there is no variable empty tank space, there can be no head variation either.

I would worry more about a definite cut off point from that crinkled wine skin when its deflated. I can imagine veins of fuel spidering away from the pickup and giving quite a lean and surging run towards the end!

Hi Martin,
The exhaust opens at 73 BBDC, transfers at 62, boost at 59, crank opens at 40 ABDC and closes at 55 ATDC. Compression is 8.5:1 with the low compression head as fitted to the CL version. Effective area of the standard 7.5mm venturi (mine actually measured 7.46mm) is 13.87 sq. mm (.021 sq. inch) and with the 8mm venturi I use it's 18.27 sq. mm (.028 sq. inch).

For interest's sake, the squish clearance is .78mm (.0307") but machining .6mm of the head button sealing area would give a squish clearance of .007" and compression of 10.55:1 which should be better suited to the zero nitro fuel I use. Something for me to play with later on .

Correct Martin, I'm used to thinking of timings just by the opening point BBDC, for one thing it's immediately obvious what the blowdown period is.

I also find very strange that I end up with so much offset from uniflow to NVA. Laps inverted and level are the same, as matter of fact,  the Level x Inverted lap times did not change as I moved the tank down.

Martin

Update on the Enya 61re:
I had made about 10 flights with an ES Designs pipe, set at 18.75.  Did not have anything close to a good run.  Hard charging out of corners and no regulation on down lines.  Was going to switch to an Aero pipe, but decided to try it with just a muffler first.  Made the first flights on the muffler today.   Got a good 4-2-4 stunt run on the muffler, and decent power for the 62oz SV-11.  Setup was the same as I was using with the pipe, see post further up in this thread.

After checking my notes I see that I had re-pitched the 13" Majik prop to 4.9.  Only 5 flights so far with the muffler, but its looking like it will take me somewhere between 5.5 - 6.0 ounces with the 10% fuel.   I think I was launching something like 9400.  Should get it dialed in next time out and be able to report more accurate numbers.  I'm starting to like this engine.  Only minor issue is it requires a wet prime to get it going.  Pulling prop thru with finger on venturi doesnt seem to work, but giving it a wet shot with primer syringe does the trick. 

That's starting to sound really good. Mine is the SE, hope the RE version becomes available again soon.