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NGH 38CC 4 stroke

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Old 11-19-2012, 12:32 PM
  #26
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Default RE: NGH 38CC 4 stroke

It looks like these guys have it http://www.amr-rc.com/index.php?path...1821&langue=en
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Old 11-19-2012, 01:05 PM
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Default RE: NGH 38CC 4 stroke

Some pictures of engine:

Exhaust valve guide. It seems bronze. Picture taken with a USB microscope through exhaust mainfold. Well lubricated !!!!

The connecting rod with needle bearings on both sides, and centered on the piston pin with two spacers.
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Old 11-20-2012, 02:50 PM
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Default RE: NGH 38CC 4 stroke

LOOK'in Good! Would like to see some more prop data. Very Interesting
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Old 11-26-2012, 11:06 AM
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Default RE: NGH 38CC 4 stroke

Well, I just ordered one from Norway
http://www.throttlestore.com/engines...e.aspx?lang=EN

As it has to go through customs, i expect it to take some time before I will get it in my hands...


At least there are a few more videos out now.

"Xoar 19x8 prop
Idles smooth at 17-1800 rpm and full throttle with these propellers at max 6230RPM"
http://www.youtube.com/watch?v=jgsMz...eature=related


and this one:
http://www.youtube.com/watch?v=gfiSpIg8pz0
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Old 11-26-2012, 10:05 PM
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Default RE: NGH 38CC 4 stroke

NGH says new party will be available on sale mid december .
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Old 12-03-2012, 07:29 AM
  #31
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Default RE: NGH 38CC 4 stroke

Thanks for the photos. The rod & all the inside,s look very well built. Capt.n
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Old 12-03-2012, 04:59 PM
  #32
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Default RE: NGH 38CC 4 stroke

Quote:
ORIGINAL: captinjohn

Thanks for the photos. The rod & all the inside,s look very well built. Capt.n
All engine parts look very well built. Also i've received some technical explanations from Michael about lubrication inside the engine parts, the reason to mount two piston rings, the pressure system to the walbro carb...... Very interesting.
I really think NGH is improving the quality of their creations.
The only thing i don't like is the 90 degrees spark plug cap. I've replaced it by a 120 degrees CM6 spark plug cap and boot similar to mounted on new DLE35RA ignitions. Much better fit.
Now i'm searching a nice airframe to mount this little jewel on front and see how it performs in the air.

Best regards, captinjohn

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Old 12-03-2012, 08:48 PM
  #33
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Default RE: NGH 38CC 4 stroke

mpascual, that is a better anglefor the sparkplug lead with the 120 degree angle. I see 2 lines from crankcase too intake manifold? Just curious to what does what ! Thanks Capt,n
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Old 12-03-2012, 09:19 PM
  #34
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Default RE: NGH 38CC 4 stroke

Hola amigo, did you adjust/test  dynamic timing too?I mean adjusting ignition timing to achieve max RPM. during WOT run.
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Old 12-04-2012, 09:26 AM
  #35
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Default RE: NGH 38CC 4 stroke

Mine arrived today......very nice

Took a few pics for size comparisson with a magnum/ASP 180, os 120, and YS 120.
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Old 12-04-2012, 09:44 AM
  #36
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Default RE: NGH 38CC 4 stroke

I always verify/adjust the timing with a timinig wheel. In this case was OK from factory.
I will try with different ignition 'curves' but i suspect (as with many others engines) , the standard A01-A2 retarding curve from RCEXL is the best compromise.


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Old 12-04-2012, 10:24 AM
  #37
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Default RE: NGH 38CC 4 stroke

Opened up my engine to inspect it, and all looks good.
The valve springs seem a little weak, and will probably limit the RPM of this engine......but that is just my guess...
8000 is the max reccomended stated in th emanaul anyway...
The engine is timmed at 6/12 o`clock.

But, the valve clearance is no good from the factory....or the lack of it.
Both my lifters where pressing slightly on the valves, where there should be slack/clearance.

So I took my saito feleer gauge, which I think is at 0.10mm and set the valves to that.
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Old 12-05-2012, 02:36 AM
  #38
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Default RE: NGH 38CC 4 stroke


Quote:
ORIGINAL: SJN

Opened up my engine to inspect it, and all looks good.
The valve springs seem a little weak, and will probably limit the RPM of this engine......but that is just my guess...
8000 is the max reccomended stated in th emanaul anyway...
The engine is timmed at 6/12 o`clock.

But, the valve clearance is no good from the factory....or the lack of it.
Both my lifters where pressing slightly on the valves, where there should be slack/clearance.

So I took my saito feleer gauge, which I think is at 0.10mm and set the valves to that.

Be careful with valve clearance.
On engines like this one I always set valve clearance close to zero (no clearance) but avoiding pressing the valves, when engine is cold.

Best regards
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Old 12-05-2012, 07:15 AM
  #39
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Default RE: NGH 38CC 4 stroke

Setting the valve clearance to zero seems like a very bad idea to me.

How mch have you run your engine ?
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Old 12-05-2012, 07:41 AM
  #40
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Default RE: NGH 38CC 4 stroke

Quote:
ORIGINAL: SJN

Setting the valve clearance to zero seems like a very bad idea to me.

How mch have you run your engine ?
Ok. Set your valve clearance at your preference.
Check the clearance when engine is very hot and after a full tank, and then let me know the clearance. Then maybe you will change your opinion.
In a gasoline four-stroke cylinder the expansion of cylinder and head is greater than the valve rod pushers. I've learning this lesson servicing Saito gas engines, and always i set clearace close to zero.
Also i've received a tech note from the manufacturer with this recommendation
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Old 12-05-2012, 07:56 AM
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Default RE: NGH 38CC 4 stroke

From Saito gas engine user manual (2012 version)
.....
In that position, adjust with the included gauge and
hexagonal wrench so the tappet gap may be set to
almost zero
when the engine is in the compression
stroke. If the gauge can enter a limit gauge with a 0.1
mm thickness, the clearance is at maximum and needs
adjustment. Adjust between 0.03 and 0.10mm (0.002
to 0.04 in.) After the gap is checked, tighten the locknut
securely. Do not over-tighten.
The tappet gap is the most important factor in the
maintenance of 4-stroke engines, and operation with
an excess clearance will degrade performance. In
particular, a large gap aggravates abrasion of the tappet
and the cam and also increases the unusual sound.
....

Maybe this info is a very bad idea .......


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Old 12-05-2012, 08:12 AM
  #42
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Default RE: NGH 38CC 4 stroke


Quote:
ORIGINAL: captinjohn

mpascual, that is a better angle for the sparkplug lead with the 120 degree angle. I see 2 lines from crankcase too intake manifold? Just curious to what does what ! Thanks Capt,n
One is to give pressure pulses from crankcase to the carb.
The second one is to release high pressure inside the crankcase when the piston is going down, to the intake mainfold, and also to get oil-petrol from intake for con-rod lubrication when piston is going up.
On this engine the amount of oil passing through the piston ring gap is lower than other engines because it mounts two rings
Best regards

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Old 12-05-2012, 09:00 AM
  #43
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Default RE: NGH 38CC 4 stroke

Question...why is 2 rings used? Seems like 1 piston ring like a Frank Bowman ring would be fine with less friction. Also that oil needs to be in bottom end for lubrication of the rod bearings.Best Regards,Capt,n
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Old 12-05-2012, 09:47 AM
  #44
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Default RE: NGH 38CC 4 stroke

I think you are mis-reading the saito manaul.

It says that the clearance must be within 0.03 and 0.10mm


"
In that position, adjust with the included gauge and
hexagonal wrench so the tappet gap may be set to
almost zero when the engine is in the compression
"

With a gauge in between the valve and tappet the gap may be set to almost zero.
Not without a feeler gauge....


But you are right that 0.10 is probably too much, as it is at the maximum of the reccomended gap.
I will adjust it to 0.03mm
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Old 12-05-2012, 05:08 PM
  #45
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Default RE: NGH 38CC 4 stroke


Quote:
ORIGINAL: SJN

I think you are mis-reading the saito manaul.

It says that the clearance must be within 0.03 and 0.10mm


''
In that position, adjust with the included gauge and
hexagonal wrench so the tappet gap may be set to
almost zero when the engine is in the compression
''

With a gauge in between the valve and tappet the gap may be set to almost zero.
Not without a feeler gauge....


But you are right that 0.10 is probably too much, as it is at the maximum of the reccomended gap.
I will adjust it to 0.03mm
NGH says between 0,03 and 0,08.
When i set the clearance on gas engines, like SAITO, and this one NGH i set the clearance to almost zero without the feeler gauge. But i'm sure the valves are fully closed.
I only use the 0.03 feeler gauge from the OS 4S toolkit when i adjust glow engines.
Best regards
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Old 12-05-2012, 05:41 PM
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Default RE: NGH 38CC 4 stroke


Quote:
ORIGINAL: SJN

Setting the valve clearance to zero seems like a very bad idea to me.

How mch have you run your engine ?
It depends on the engine. Some engines the valve tappet clearance will grow bigger as it heats up. For example...the old Harley Davison 74 cubic inch engine had only a .001 inch >>one thousands clearance COLD. That grew quite a bit when temp was up on the engine. Capt,n
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Old 12-06-2012, 04:45 PM
  #47
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Default RE: NGH 38CC 4 stroke

Well, I took the first step. I just bought one. I will let you know when it gets here.
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Old 12-06-2012, 08:19 PM
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Default RE: NGH 38CC 4 stroke

I too have one on order out of canada, should be here any day, can't wait!

Mark.
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Old 12-07-2012, 09:37 AM
  #49
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Default RE: NGH 38CC 4 stroke

Have you guys tried to install the included stand-off`s ?
3 of them install fine, but the fourth one fouls on the carb bolt, and cant be installed. [&:]


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Old 12-07-2012, 12:43 PM
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Default RE: NGH 38CC 4 stroke

could you grind enough off of that carb bolt to make it fit?
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