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NGH 9cc

Old 12-13-2011, 12:47 PM
  #51  
Turk1
 
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Default RE: NGH 9cc

Sure but simultaneously Michael is designing a special glow carb system to improve Chinese glow carb weakness.I guess some similiarity.
Old 12-13-2011, 02:42 PM
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Default RE: NGH 9cc

A needle braring on the big end of the rod is necessary because most fliers don't want to use enough oil in the fuel...Large converted 2 strokes can get by on 10%, smaller ones need the same amount as a small glow engine...Then there will be complaints about oil on the fuselage, just like glow engine...Can't have it both ways.....
If the needle bearing was not necessary Tom at BME would not go to the trouble of pushing the crank pin out and replacing it with a harder one....
Old 01-03-2012, 10:47 PM
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Default RE: NGH 9cc

A needle bearing conrod on a 9 cc engine is possible, but not economically feasible on an engine designed to a $165- retail price point.

There is nothing difficult about running 5% (20:1) oil mix .. it's only 50 millitres per litre.
Old 01-03-2012, 11:13 PM
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Default RE: NGH 9cc

The pump is larger than the carb...A Cline regulator does the same thing but is pricey....
So how come the video doesn/t show the pressure fitting for the pump in the rear cover ?
Old 01-04-2012, 02:28 AM
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Default RE: NGH 9cc


ORIGINAL: Antique

A needle braring on the big end of the rod is necessary because most fliers don't want to use enough oil in the fuel...Large converted 2 strokes can get by on 10%, smaller ones need the same amount as a small glow engine...Then there will be complaints about oil on the fuselage, just like glow engine...Can't have it both ways.....
If the needle bearing was not necessary Tom at BME would not go to the trouble of pushing the crank pin out and replacing it with a harder one....

Like Saito small gas engines ? The FG36 (36cc) does not have needle bearings on the con-rod.
Like oldies spark plug small engines ?

On a 4 Stroke engine the amount of fuel (with oil) is smaller than a 2S engine and oil-fuel flow mix does not goes directly to crankcase (and con-rod) as 2S does.
Lubricity of gas(petrol) is much more than methanol.
I've count the needles on a small needle bearing availables today (caged), and the contact surface with the crankshaft pin is so small and can cause more troubles than a plain bushing.
Only my experience.

Best regards
Old 01-04-2012, 02:31 AM
  #56  
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Default RE: NGH 9cc


ORIGINAL: Antique

...

So how come the video doesn/t show the pressure fitting for the pump in the rear cover ?
....
Because this video was taken on a prototype, before the gas supply system was available.
Find the last one with this device installed and you can see the pressure fitting in the rear cover.

Best regards
Old 01-04-2012, 03:37 AM
  #57  
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Default RE: NGH 9cc


ORIGINAL: mpascual
Like Saito small gas engines ? The FG36 (36cc) does not have needle bearings on the con-rod.
Like oldies spark plug small engines ?

On a 4 Stroke engine the amount of fuel (with oil) is smaller than a 2S engine and oil-fuel flow mix does not goes directly to crankcase (and con-rod) as 2S does.
Lubricity of gas(petrol) is much more than methanol.
I've count the needles on a small needle bearing availables today (caged), and the contact surface with the crankshaft pin is so small and can cause more troubles than a plain bushing.
Only my experience.

Best regards
Whilst I do applaud Michaels attempts to creat something attractive to part of the market by making it a little diufferent to the myriad of other offerings fom his countrymen, He has not done to well so far in making his offerings anywhere near to decent for regular flight over an extended number of flying days.

A couple of things about your post

Comparing anything of Michaels creation to a Saito is quite an insult to Saito

The "Oldy" engines to which you refer also ran high oil QTY in their fuel.
I never realised the NGH 9cc was a 4 stroke - why even compare it to one? On a 4 stroke, the heat input is also for half the revolutions of a 2 stroke.
Michaels creations to date have a long history of early crankpin / bushing failures - that is called the proof in the pudding.

Old 01-04-2012, 03:52 AM
  #58  
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Default RE: NGH 9cc

It would seem that the reputation takes quite a hit if all other considerations are ignored except profit, and a quick return on investment. I bear no personal ill will powards Mr. Chow but do hold him accountable for selling an untested product that has proven to be defective. It will take a long time to earn back lost trust. There's an old saying that applies here:" Fool me once, shame on you. Fool me twice, shame on me!" It is very difficult to fool me twice.
Old 01-04-2012, 07:57 AM
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Default RE: NGH 9cc

"Oldy" spark engines use 3 parts gas and 1 part 70 weight oil...Just like all old 2 stroke outboard motors, 1/2 pint oll to 1 gallon gas....No roller bearings needed with that much oil...
big converted gassers like ST 3000s can get by with 10 % oil and no roller bearings...
One of the best old time glow fuels was sold by Duke Fox, 18% castor...21.6 OUNCES in a gallon...
Old 01-04-2012, 12:55 PM
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Default RE: NGH 9cc

ORIGINAL: aussiesteve


ORIGINAL: mpascual
Like Saito small gas engines ? The FG36 (36cc) does not have needle bearings on the con-rod.
Like oldies spark plug small engines ?

On a 4 Stroke engine the amount of fuel (with oil) is smaller than a 2S engine and oil-fuel flow mix does not goes directly to crankcase (and con-rod) as 2S does.
Lubricity of gas(petrol) is much more than methanol.
I've count the needles on a small needle bearing availables today (caged), and the contact surface with the crankshaft pin is so small and can cause more troubles than a plain bushing.
Only my experience.

Best regards
Whilst I do applaud Michaels attempts to creat something attractive to part of the market by making it a little diufferent to the myriad of other offerings fom his countrymen, He has not done to well so far in making his offerings anywhere near to decent for regular flight over an extended number of flying days.

A couple of things about your post

Comparing anything of Michaels creation to a Saito is quite an insult to Saito
Who has compared engines ? I've oly said Saito engines does not mount needle bearings, only plain bushing on the crankshaft side , and nothing on wrist pin side on some gas engines

The ''Oldy'' engines to which you refer also ran high oil QTY in their fuel.
And people using this kind of engines keep manufaturers instructions about recommended fuel/oil ratio. Do the same on NGH engines.

I never realised the NGH 9cc was a 4 stroke - why even compare it to one? On a 4 stroke, the heat input is also for half the revolutions of a 2 stroke.
Are you sure? I know the difference between a 4s and a 2S. Only was a reference to compare with engines with less lubrication and higher running temp than a 2Stroke

Michaels creations to date have a long history of early crankpin / bushing failures - that is called the proof in the pudding.
Maybe you're saying Saito gas engines does not have crankpin/bushing failures? We can talk about crank pin bushing/needle bearings failures on MANY engines brands. What's the first ?

Regards
Old 01-18-2012, 05:56 PM
  #61  
michaelchow
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Default RE: NGH 9cc

it seems the "key" Fuel-delivery-system work well.

http://s1207.photobucket.com/albums/bb472/Wolly22/?action=view&current=PT-19.mp4

Old 01-18-2012, 06:15 PM
  #62  
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Default RE: NGH 9cc

Please do not load this video on photobucket. It works better and belongs on YouTube. Thanks Capt,n
Old 01-19-2012, 05:10 AM
  #63  
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Default RE: NGH 9cc


ORIGINAL: captinjohn

Please do not load this video on photobucket. It works better and belongs on YouTube. Thanks Capt,n
it was firstly on youtube but the owner deleted it... http://www.youtube.com/watch?feature...&v=COn79YnsOiQ
Old 01-19-2012, 11:49 AM
  #64  
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Default RE: NGH 9cc

Just got my '9 today. 4 days from Himodel to San Diego. Paid $200 total. Chose DHL express. Hope to get broke in this weekend.

There are some very interesting videos from aguy called Surats on Youtube running this engine. Seems to run slightly better using muffler pressure instead of the pump.....Especially the throttle response. Must be some pressure lag in the pump but I did notice he was using some very long fuel lines. The manual has a supplement sheet that is pretty specific on pump placement and fuel line length. Anyway, should be fun.

Later,
Mike
Old 01-23-2012, 09:21 PM
  #65  
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Default RE: NGH 9cc

Hi,

This weight on the site Himodel (full 545g, 1.20 lbs) is correct?

Regards
Old 01-26-2012, 04:04 AM
  #66  
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Default RE: NGH 9cc

Sir, GT9 = One .56 size glow engine + CDI + fule-delivery-system,  engine weight 425g, CDI weight 120g, Fule-delivery-system weight: 45g, total weight almost 590g
Old 01-26-2012, 04:20 AM
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Default RE: NGH 9cc

Some rpm numbers ....

APC 10x6 : 13.400 rpm
APC 11x6 : 11.900 rpm
APC 11x7 : 11.700 rpm
APC 12x6 : 10.700 rpm
APC 12.25x3.75 : 12.300 rpm

rpm numbers without muffler installed, after 1 hour break-in as user manual procedure, 95 IO fuel mixed @ 20:1 ratio (5%) Motul 800 full esther shyntetic 2 Stroke.

Engine needs more break-in time to develop the full potential .
Here is a picture of the piston ring after the first break-in session.
Sorry, but comments added are in spanish, but the picture talk itself



Best regards
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Old 01-26-2012, 10:07 AM
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Default RE: NGH 9cc

Am I seeing evidence of a very rough casting, or wear from running?
Old 01-26-2012, 11:31 AM
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Default RE: NGH 9cc

Hi Michaelchow,

great, many thanks!

Regards from Romania
Jimmy and Mugurel
Old 01-26-2012, 02:08 PM
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Default RE: NGH 9cc

ORIGINAL: Lifer

Am I seeing evidence of a very rough casting, or wear from running?

I don't think so. You are seeing a picture taken with a magniscope.


Let me know what do you think about this picture of 50cc engine from a famous manufacturer.

Best regards
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Old 01-26-2012, 02:15 PM
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Default RE: NGH 9cc

After Break-in a GT9. (without muffler) . APC 12.25-3.75 prop

[youtube]http://www.youtube.com/watch?v=CWdTA3th0k0[/youtube]


Best regards
Old 02-05-2012, 03:12 AM
  #72  
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Default RE: NGH 9cc

My engine (or should I say engine accessories) had the following faults "out of the box"

1. One of the screws on the pump was cross threaded. Resolved by myself.

2. Carb low speed needle was not centred on fuel nozzle. Resolved by myself.

3. Carb fuel nozzle inlet not centred on high speed neeedle. It was drilled "off centre". Result being, the engine could not be leaned out as the high speed needle tip could not enter the orifice.

As a result the supplied carb was for all intents useless. There is no purpose to the membrane at the front of the carb. It simply acts as a seal.

I have returned the carb to HiModel with a note explaining the defects and requesting a replacement. We will see.

In the meantime to avoid owning a paperweight I am adapting a standard 46 size twin needle glow carb to work with the pump and engine. Initial running results are promising although the low speed needle on the replacement carb requires a finer taper to ensure clean transition from idle to full speed.
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Old 02-05-2012, 04:30 AM
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Default RE: NGH 9cc

Looks good at the moment, for me I'll have to check back in about 12 months to make sure it's still fine. Hoping they do not have any issues.

Andy
Old 02-05-2012, 05:51 AM
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Default RE: NGH 9cc


ORIGINAL: fiery

My engine (or should I say engine accessories) had the following faults ''out of the box''

1. One of the screws on the pump was cross threaded. Resolved by myself.

2. Carb low speed needle was not centred on fuel nozzle. Resolved by myself.

3. Carb fuel nozzle inlet not centred on high speed neeedle. It was drilled ''off centre''. Result being, the engine could not be leaned out as the high speed needle tip could not enter the orifice.

As a result the supplied carb was for all intents useless. There is no purpose to the membrane at the front of the carb. It simply acts as a seal.

I have returned the carb to HiModel with a note explaining the defects and requesting a replacement. We will see.

In the meantime to avoid owning a paperweight I am adapting a standard 46 size twin needle glow carb to work with the pump and engine. Initial running results are promising although the low speed needle on the replacement carb requires a finer taper to ensure clean transition from idle to full speed.

Sorry to read all issues you have with the engine.
Mine works VERY well.
On the video idle seems to be not very reliable , it's my fault because i lost the pushrod retainer on the lever.
Also i must close the LNS almost 2 turns from factory settings.

Best regards and good luck with HiModel ....

Old 02-05-2012, 07:43 AM
  #75  
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Default RE: NGH 9cc

As far as I know all NGH engines have test run before leaving factory.That one should be a missed one.

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