RE: NGH 38CC 4 stroke    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> RE: NGH 38CC 4 stroke
Page: <<   < prev  1 [2] 3 4 5 6 7 8 9 10   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: NGH 38CC 4 stroke - 11/19/2012 8:32 PM   
3136


 

Posts: 537
Score: 135
Joined: 10/3/2010
Last Login: 5/21/2013
From: Victoria, AUSTRALIA
Status: offline 		It looks like these guys have it http://www.amr-rc.com/index.php?path=content&SC=produits&SUBSC=engines&page=produit_info&produit_categorie_id=3&produit_sous_categorie_id=&marque=&produit_id=1821&langue=en

_____________________________

regards Mark

Hide Signatures

(in reply to airraptor)
       Post #: 26

RE: NGH 38CC 4 stroke - 11/19/2012 9:05 PM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline 		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.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to airraptor)
       Post #: 27

RE: NGH 38CC 4 stroke - 11/20/2012 10:50 PM   
SkyPilot101


 

Posts: 450
Score: 125
Joined: 6/25/2007
Last Login: 5/26/2013
From: Freedom, PA, USA
Status: online 		LOOK'in Good! Would like to see some more prop data. Very Interesting

Hide Signatures

(in reply to mpascual)
       Post #: 28

RE: NGH 38CC 4 stroke - 11/26/2012 7:06 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		Well, I just ordered one from Norway
http://www.throttlestore.com/engines/gas_engines/ngh_gf_38_fs_38cc_gas_engine.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=jgsMzQpYsis&feature=related


and this one:
http://www.youtube.com/watch?v=gfiSpIg8pz0

_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to SkyPilot101)
       Post #: 29

RE: NGH 38CC 4 stroke - 11/27/2012 6:05 AM   
Turk1



Posts: 1023
Score: 108
Joined: 10/8/2004
Last Login: 5/24/2013
From: Istanbul, TURKEY
Status: offline 		NGH says new party will be available on sale  mid december .


Hide Signatures

(in reply to SJN)
       Post #: 30

RE: NGH 38CC 4 stroke - 12/3/2012 3:29 PM   
captinjohn


 

Posts: 12094
Score: 247
Joined: 1/25/2002
Last Login: 5/25/2013
From: Hesperia Michigan, MI, USA
Status: offline 		Thanks for the photos.  The rod & all the inside,s look very well built.  Capt.n

_____________________________

I never met a engine I did not like !

Hide Signatures

(in reply to Turk1)
       Post #: 31

RE: NGH 38CC 4 stroke - 12/4/2012 12:59 AM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline
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



Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to captinjohn)
       Post #: 32

RE: NGH 38CC 4 stroke - 12/4/2012 4:48 AM   
captinjohn


 

Posts: 12094
Score: 247
Joined: 1/25/2002
Last Login: 5/25/2013
From: Hesperia Michigan, MI, USA
Status: offline 		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

_____________________________

I never met a engine I did not like !

Hide Signatures

(in reply to mpascual)
       Post #: 33

RE: NGH 38CC 4 stroke - 12/4/2012 5:19 AM   
Turk1



Posts: 1023
Score: 108
Joined: 10/8/2004
Last Login: 5/24/2013
From: Istanbul, TURKEY
Status: offline 		Hola amigo, did you adjust/test  dynamic timing too?I mean adjusting ignition timing to achieve max RPM. during WOT run.


Hide Signatures

(in reply to captinjohn)
       Post #: 34

RE: NGH 38CC 4 stroke - 12/4/2012 5:26 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		Mine arrived today......very nice

Took a few pics for size comparisson with a magnum/ASP 180, os 120, and YS 120.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to Turk1)
       Post #: 35

RE: NGH 38CC 4 stroke - 12/4/2012 5:44 PM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline 		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.


Best regards

Hide Signatures

(in reply to Turk1)
       Post #: 36

RE: NGH 38CC 4 stroke - 12/4/2012 6:24 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		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.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to mpascual)
       Post #: 37

RE: NGH 38CC 4 stroke - 12/5/2012 10:36 AM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline
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

Hide Signatures

(in reply to SJN)
       Post #: 38

RE: NGH 38CC 4 stroke - 12/5/2012 3:15 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		Setting the valve clearance to zero seems like a very bad idea to me.

How mch have you run your engine ?

_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to mpascual)
       Post #: 39

RE: NGH 38CC 4 stroke - 12/5/2012 3:41 PM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline
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
Best regards



Hide Signatures

(in reply to SJN)
       Post #: 40

RE: NGH 38CC 4 stroke - 12/5/2012 3:56 PM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline 		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 .......


Best regards

Hide Signatures

(in reply to mpascual)
       Post #: 41

RE: NGH 38CC 4 stroke - 12/5/2012 4:12 PM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline
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



Hide Signatures

(in reply to captinjohn)
       Post #: 42

RE: NGH 38CC 4 stroke - 12/5/2012 5:00 PM   
captinjohn


 

Posts: 12094
Score: 247
Joined: 1/25/2002
Last Login: 5/25/2013
From: Hesperia Michigan, MI, USA
Status: offline 		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

_____________________________

I never met a engine I did not like !

Hide Signatures

(in reply to mpascual)
       Post #: 43

RE: NGH 38CC 4 stroke - 12/5/2012 5:47 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		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

_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to captinjohn)
       Post #: 44

RE: NGH 38CC 4 stroke - 12/6/2012 1:08 AM   
mpascual


 

Posts: 445
Score: 115
Joined: 10/22/2003
Last Login: 12/27/2012
From: Tres Cantos, SPAIN
Status: offline
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

Hide Signatures

(in reply to SJN)
       Post #: 45

RE: NGH 38CC 4 stroke - 12/6/2012 1:41 AM   
captinjohn


 

Posts: 12094
Score: 247
Joined: 1/25/2002
Last Login: 5/25/2013
From: Hesperia Michigan, MI, USA
Status: offline
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

_____________________________

I never met a engine I did not like !

Hide Signatures

(in reply to SJN)
       Post #: 46

RE: NGH 38CC 4 stroke - 12/7/2012 12:45 AM   
jeffEE



Posts: 1018
Score: 120
Joined: 11/18/2002
Last Login: 5/25/2013
From: farmingtom, MN, USA
Status: offline 		Well, I took the first step. I just bought one. I will let you know when it gets here.

_____________________________

If its not a warbird, Its just a target.

Hide Signatures

(in reply to captinjohn)
       Post #: 47

RE: NGH 38CC 4 stroke - 12/7/2012 4:19 AM   
MKnutson


 

Posts: 79
Score: 100
Joined: 9/16/2003
Last Login: 5/25/2013
From: Shoreline, WA, USA
Status: offline 		I too have one on order out of canada, should be here any day, can't wait!

Mark.

Hide Signatures

(in reply to jeffEE)
       Post #: 48

RE: NGH 38CC 4 stroke - 12/7/2012 5:37 PM   
SJN



Posts: 5800
Score: 105
Joined: 9/28/2002
Last Login: 5/26/2013
From: Copenhagen, DENMARK
Status: online 		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.




Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Sonnich Johannesen

Hide Signatures

(in reply to MKnutson)
       Post #: 49

RE: NGH 38CC 4 stroke - 12/7/2012 8:43 PM   
Ernie Misner



Posts: 4667
Score: 130
Joined: 7/5/2002
Last Login: 5/25/2013
From: Tacoma, WA, USA
Status: offline 		could you grind enough off of that carb bolt to make it fit?

Hide Signatures

(in reply to SJN)
       Post #: 50

Page:   <<   < prev  1 [2] 3 4 5 6 7 8 9 10   next >   >>  
All Forums >> Glow Engines, Gas Engines, Fuel &amp; Mfg Support Forums >> Gas Engines >> RE: NGH 38CC 4 stroke
Page: <<   < prev  1 [2] 3 4 5 6 7 8 9 10   next >   >>  




Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


1.609RCU1