dirtybird

My Feedback: (5)

Have you tried the OS gas-glow [lug on your engine?

jspauld2

We have not tested that at Horizon since the OS GGT has been released.. Early on in the 10cc development, we did experiment with running gas on a glow plug. Ultimately, we decided the benefits did not outweigh the reliability of spark ignition. I have not seen one of the OS GGTs run, but it is an intriguing concept.

Jimmy

the pope

Thanks Jimmy , you do realize Im from Australia ? I dont know how that affects horizons support in that is it world wide or just a USA thing ? I did get the engine when they 1st became available ( and I mean the very day ) . I guess I do need to start running it . Its been sitting in an ugly stik as I didnt want to press another plane into action until I retire another . Is there a time frame that the problem will show itself if its going to ? cheers the pope

jspauld2

I did know that, but forgot the issue with servicing Australia. We will make every effort to support the engine regardless of your location. If you run into any issues, please just contact me directly and I will try to get it all straightened out. It will become apparent fairly quickly if you will have a problem.

Thanks!
Jimmy

the pope

Thanks Jimmy . Cheers

AirmanBob

My Feedback: (14)

Well, I'm very happy so far with my Evo 10cc gen2 with the pumped carb. I'm running 20:1 Stihl Ultra HP synthetic oil and now a 11x6 prop.

I've run about 6 tanks of fuel through it, one tank on the ground, the rest in the air. I'm using a 6 ounce tank because that's what fits.

My OS46 did a good job in this plane but the Evo does a great job. The plane (a Phoenix Dolphin) is way faster and I love the sound. It sounds like a baby Harley...

My OS made a oily mess out of the plane. The Evo puts out a little black soot that is easily wiped off.

I had to go 1 click in on the high needle and a little less on the low side. I will be trying a 12x6 on it later when it has been broken in.

Did I mention the sound..... I love it!

Bob

AirmanBob

My Feedback: (14)

Yeah... what Bob said !!!!!

AirmanBob

My Feedback: (14)

Well, I switched to a 12x6 Master Airscrew K6 series and the engine seems to like that a lot better. I had to open the high speed needle about 3 clicks and the idle about 2 clicks and it runs great.

I'm really enjoying all the extra power and fuel economy. And my plane stays so much cleaner now. Also, it starts up so easily, and no more glow plugs to burn out.

Highly recommended.

Bob

I think it was a great investment.

ashby

Oops double entry

ashby

I have two Evo 10's with the original carbs on them. Both are fitted to planes that require them to be fitted inverted and while they have been running Ok I have always considered the pump carb as a better way to go.
I bought two carbs from Horizon and when they arrived immediately took one of my motors out of the plane and fitted the new carb. Whole operation took less than an hour and I was happy with the final product. Fitted the motor to my test stand and fired the motor up, worked like a charm and ran up and down the rpm with no hitches. Very pleased with the mod. 
Then fitted it back into the plane and took the plane down to the field for a test flight. Unfortunately nothing happened, could not get the motor to start no matter what I tried. After much frustration I packed up and decided to investigate on my workbench where I have sufficient tools. 
I always check electrics first as that is a common problem. Using the Rxcel tester I determined that the sensor worked, the CDI was fine but when I checked for a spark no luck. Changed plugs and still no spark so changed CDI units from the other motor and all was good, nice spark and that allowed me to try again. Still no luck with the starting. Starter was actually getting warm with the workout. Took the plug out and no fuel! So put the plug back in and rigged a means to cover and uncover the carb air inlet with out getting my hands too close to the prop. This time with the air inlet closed the engine fired up but only ran for a few seconds. This was a good indication of not enough fuel getting through. So checked the low end needle adjustment and found it was wound in tight, tried to wind it back out but it just spun freely as though it was sheered off. Wondering if there was a bit of binding on the throttle body and as I tested my throttle limits I wound the unit in? Either way it was not working. So grabbed the other carb that was destined for my second motor and fitted that, checked the low end needle and it was a lot further out, so hopefully it was in the right factory setting. Once everything was connected I put the starter on and within seconds had a happily running engine that ran up and down through the rpms beautifully  
Now I have a carb that is stuffed and wonder if Horizon will fix or replace for me? Looks like I will also be needing a new CDI unit as well.
Looking forward to flying this Sunday though should be a lot of fun.

ahicks

My Feedback: (2)

You didn't mention one way or the other, so I have to wonder, did you install a pulse port on the crank case somewhere when you went with the new style carbs?

ashby

Yes placed it in the same location that they have it on the new engines. quite a bit of meat there to drill and tap into, so it was easy. Just have to make sure it is a small nipple and it is centred other wise it will interfere with the surrounding projections of the engine, fins etc.
I also checked for wear as per your post Earl and found this engine to be fine.

ahicks

My Feedback: (2)

Have you had this new carb apart to see what happened to allow the idle needle to spin freely? If I remember right, there's a couple of O-rings on it to keep it snug wherever you leave it. If those are missing or messed up, I could see it turning pretty easily. -Al

ashby

No Al I have just put it on the bench and deciding on the best course. I guess it is possible to rebuild the offending part using the pieces from the old venturi carb but I have asked Horizon if they will help on this.

ahicks

My Feedback: (2)

Don't blame you for asking about help, but I was thinking about robbing parts from the original carb. From what I've seen, the parts from both in that area are interchangeable. For the time it might take to swap them out, that would be my plan....

ashby

I will have a look tonight and play around a bit. it is a worthy plan as it will allow me to put my other plane back together and get it on the field.

ashby

So I started taking the carb apart to find out what went wrong. Easy stuff first with the removal of the throttle arm and then undoing the over size bolt which is holding down the pump cover and releases the barrel. When I pulled the barrel out the needle stayed in the carb! Curious as I am I pulled the needle out and the spring that helps keep the barrel tight. Nothing wrong with the needle it is a very simple design and the two o rings were in good condition. So I placed the needle back into the barrel and screwed it back in. The threads caught nicely and everything went back together like new. Now I am really curious as to why it dropped out of the thread before stopping? How can I gently wind in the needle until it stops and then wind out the required 5 turns? This will be interesting and will need further investigation, no doubt there is a simple explanation and I look forward to finding out what it is

ahicks

My Feedback: (2)

You're holding the barrel/throttle just cracked open with that piece of wire when setting the 5 3/8 turns out?

Regarding that 5 3/8 turn setting, my broken in engines both do well at something just under 5 turns, so that's where I started setting mine after having one apart for some reason. Also, I was working with somebody on another forum, and apparently there's a revision in the instruction manual now being supplied, for a new suggested setting of 4 1/4 turns (vs. the original 5 3/8). Just food for thought. -Al

ashby

How I read that is the turns on the low speed are sufficient to open the gap slightly when the throttle is in closed position. That actually makes a lot of sense.
Now to find out why my cdi is not giving a spark, suspect the spark plug lead.

ahicks

My Feedback: (2)

If you've nosed it over on a less than graceful landing, that'l do it for sure!

ashby

Nosing over is probably a polite description for the event that pushed me to fitting pumped carbs

Joystick TX

I finally got around to checking the actual voltage range for the EVO RCEXL engine ignition.

Based on my testing it looks like it will work from 4.3 Volts to 8.4 Volts.

I didn't test for operation over the high end of the voltage range for obvious reasons, but I did want to test the low end.

While it is possible to use the EVO ignition module with a 4.8 Volt Nicad, or NiMH battery pack, it will be a problem if an IBEC is used with it, since that will drop the voltage by at least 0.6 Volts. Most meters used to check the pack will show OK down to 4.6 Volts, that will not be good for the ignition since it will be at only 4 Volts, 4.6 minus the IBEC drop of 0.6, and the ignition module will not fire.


All this is based on a limited sample, so there may be a couple of hundred millivolts error.

ahicks

My Feedback: (2)

ashby
That'll do it! The metal boot on this engine, as well as the one on it's bigger cousins (the CM-6 boot) are pretty exposed in an inverted install, and do not take kindly to that kind of thing at all. If the engine starts showing hard to start symptoms after an incident like that, just change it.

smr2ley

I just purchased on ebay (US) a great condition secondhand 10GX2, great that is except the US seller obviously couldn't get it to run when HE had bought it, I found the carb must have been taken apart and the front metal cover was fitted the wrong way around so the pump wouldn't work, easy fixed. The low speed needle was just about falling out so I followed the instruction book to set the low and high speed needles exactly to spec, as they were all over the place from the previous guy. (Don't some people mess around!)
I have recently bought a new O.S.GGT15 which is the gas engine with a GLOWPLUG, and I had a spare G5 plug which screwed directly into the 10GX2, it fired up first time and it runs great, without any adjustments whatsoever. I have saved over 2/3 the new cost by buying this non-running engine. And this is how I intend to use it. NO IGNITION SYSTEM, so saving the extra weight and no fiddling about with extra wiring. Very pleased with it, going initially in an Acrowot Mk2 to replace the previous K&B 65 sportster, that engine really hauls but is pretty thirsty.

DCGayhart

My Feedback: (22)

WOW, I'll have to try that. Would not have expected the 10GX to run on glow. How is the performance compared to ignition?