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Old Mar 03, 2013, 01:34 AM
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Istanbul, Turkey
Joined Aug 2004
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Boostoman, another way to use NGH engine flawless with original carb is the way I describe before in this thread.Remove the regulator needle and leave the pump function only,put a return line with a T just before the carb inlet and run.Maybe you will need to cut a little the LSN also from the tip.(about 0,5 mm.)
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Old Mar 03, 2013, 06:23 AM
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Pleasant Valley Modelport
Joined Sep 2006
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Did you guys know you can easily make a cog or V belt reduction drive and use a much larger prop ? Probably need to be wood. And now an electric plastic MIGHT (I say) work. Maybe a 1.3 or so looks good as an estimate. I have found that an odd number makes less prop resonation vibration.

That way the engine can be mounted upright and maybe even not have to make cutouts for engine clearance.
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Old Mar 07, 2013, 08:47 AM
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I have experience with 3 of these NHG 9 engines and what I have found fully agree with that explained by many users here:

1.- Pump/regultor very sensitive to vibrations and produce air bubbles when mounted to engine rear. By the way, the pump/regulator mount breaks after some time also due to vibration.

2.- You get engine idle with carburetor barrel mid opened and a lot of fuel is trought the carb air inlet on idle an mid ranges.

3.- Tune up is quite critical, mainly for HSN rather than for LSN although if you close too much the LSN engine, simply, will not be able of reving up. HSN varies between 1 and 1,5 turns from closed depending the engine and is quite difficult to get an acceptable level top speed and at the same time that engine does not cut when nose up.

4.- Also 2 of the exhaust got its mounting thread easily damaged just giving little -but very little- force at the mounting screws. This can be easily solved running a tap though the thread and using longer M3 screws.

On the other hand, what I have not read is about they are nearly "2 speed engines" : idle and full throttle, being almost impossible to get a noticeable mid range. Do you have the same feeling regarding this engine?.

Any way (manually or from a transmitter) I have tried, any throttle curve I may program engines tend to rev up slowly at first moment but then they go to full throttle suddenly. Do you have also noticed this?.

Best Regards,


Jesus Cardin
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Old Mar 07, 2013, 08:57 AM
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I'll have to check my NGH 9cc engines out again at the flying field, I don't remember anything much about the mid-range throttling now. I'll have to check it out again.
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Old Mar 07, 2013, 09:49 AM
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Thanks Earl.

Jesus Cardin
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Old Mar 08, 2013, 12:35 AM
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Hervey Bay, Queensland, Australia
Joined Mar 2008
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I am thinking the carburettor for the Evolution 10 cc sparkie would be a good retro-fit to the NGH 9 cc. Has anyone tried it?

The Evolution carbs are sold as spare parts by Horizon Hobby. Cost is pretty steep.

http://www.horizonhobby.com/products...ne-EVOE10GX#t4
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Old Mar 08, 2013, 12:38 AM
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Oman, Masqat
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fiery,

I have both engines with me (evo and NGH) I will see if i will be able to fit the Evo carb on the NGH and let you know
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Old Mar 08, 2013, 12:52 AM
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Israel, Ramat HaSharon
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Quote:
Originally Posted by Boostoman View Post
fiery,

I have both engines with me (evo and NGH) I will see if i will be able to fit the Evo carb on the NGH and let you know
I own neither, BM.

But the NGH is equipped with an external pump for fuel delivery, while the Evo uses a muffler pressurized fuel system...

I am not sure whether or not the Evo carburettor can run properly with fully pressurized fuel delivery.
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Old Mar 08, 2013, 01:07 AM
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The Netherlands
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Quote:
Originally Posted by DarZeelon View Post
I own neither, BM.

But the NGH is equipped with an external pump for fuel delivery, while the Evo uses a muffler pressurized fuel system...

I am not sure whether or not the Evo carburettor can run properly with fully pressurized fuel delivery.
You are making a thinking error here: that fuel pump is only partly a pump. It is mainly a pressure regulator with atmospheric pressure as reference.
It does NOT deliver fuel to the carb at a certain, noticeably elevated pressure, it only makes sure that the fuel pressure at the needles is as constant relative to atmospheric pressure as possible.

If the Evo does have tank-pressure (I don't know, I do not own even one of them either) than the Evo carb is obviously capable of running a pressurized fuel delivery, where the NGH needs a regulated pressure (which is a completely different animal) only.

Brgds, Bert
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Old Mar 08, 2013, 04:47 AM
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Quote:
Originally Posted by DarZeelon View Post
I own neither, BM.

But the NGH is equipped with an external pump for fuel delivery, while the Evo uses a muffler pressurized fuel system...

I am not sure whether or not the Evo carburettor can run properly with fully pressurized fuel delivery.
Post: 1464

Quote:
Originally Posted by Brutus1967 View Post
You are making a thinking error here: that fuel pump is only partly a pump. It is mainly a pressure regulator with atmospheric pressure as reference.
It does NOT deliver fuel to the carb at a certain, noticeably elevated pressure, it only makes sure that the fuel pressure at the needles is as constant relative to atmospheric pressure as possible.

If the Evo does have tank-pressure (I don't know, I do not own even one of them either) than the Evo carb is obviously capable of running a pressurized fuel delivery, where the NGH needs a regulated pressure (which is a completely different animal) only.

Brgds, Bert

Both your knowledge about IC engine carbureting related fuel delivery systems for model engines is very limited and there is no way to expand these knowledge, at least not by reading forums or magazines.

To understand all principles you actually have to be educated, being designer and builder of these systems yourself. The manufacturers do not explain you the working principle in detail of course, why should they! It's much better for them to write HOW to use them, limitations of their system will be misunderstood and interpreted anyway .

In the engine reviews and magazine sometimes people are experienced machinists or auteur, but no specialists of carburettors. So these publiced articles are all tales without calculation examples and detailed functional descriptions. Good enough related to the knowledge of the average Joe, to sell the magazines.

The products actually are based on the knowledge and preference of the engineers of the manufacturer, that's why we see the variants of which, when we read the commercial explanations, are all the best, Variants of the systems in reality are much more than you will understand and still part of the secret world of model engines, even now we arrived in the era of electric propulsion!

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Old Mar 08, 2013, 11:03 PM
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Istanbul, Turkey
Joined Aug 2004
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It is obvious that if an Evo carb to mount then no NGH reg/pump unit should be used.Only muffler pressure+ Evo carb+NGH 9 engine.
The sole problem is (Sorry again and again) GT9 carb has not proper suction graph to make regulator work according to engine needs.Also LSN profile is not helping,contrarily worsening the situation.
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Old Mar 13, 2013, 05:41 AM
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Brazil, São Paulo, Holambra
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Hello flyers.

Somebody tryed use a Evolution 10GX carb on this motor?? Is it possible get a good adjustment with this carb on the NGH 9?

Regards

Andre Lima - Brazil
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Old Mar 26, 2013, 04:27 PM
SBP
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United States, PA, Waynesboro
Joined Aug 2011
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A little help

Ok , it's time to get this engine running. I've had it all winter but never got around to getting it going. This will be my first gasser and I can't find info on the ignition wiring. Battery wire, plug wire, rpm signal output and one more. Battery and plug wires pretty straight foreward. RPM signal output I assume goes to the sensor on the front of the engine. What is the function of the last wire? I retire in 2 months and the only thing that will effect flying time is weather. I need to be ready. I like the electrics but I've always wanted to try a gasser.
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Old Mar 26, 2013, 06:42 PM
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United States, HI, Kailua
Joined Dec 2011
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The wire marked RPM is for a tachometer. The other wire goes to the pickup on the front of the engine.
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Old Mar 26, 2013, 07:26 PM
SBP
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United States, PA, Waynesboro
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Thanks, I really appreciate the reply. I'll see if she will start tomorrow.
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