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NGH 38CC 4 stroke

Old 06-13-2019, 04:23 AM
  #1651  
mchandrayan
 
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Originally Posted by tyor View Post


I have 2 ngh 38cc They have worked excellently for 6 years and have been used extensively. The hoses are connected equally on both motors and have never been a problem.
Top nipple on manifold on to top nipple on back plate and lower to lower.
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Old 06-13-2019, 04:34 AM
  #1652  
acdii
 
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I don't think it matters really. There is not enough oil in those lines to cause any issues.
Old 06-13-2019, 05:50 AM
  #1653  
EFHANC
 
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Are you guys running the stock timing , if not what do you have it set at, also your oil ratio preference , thanks
Old 06-13-2019, 07:59 AM
  #1654  
cathurga
 
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Haha Tyor....I see you couldnt resist the opportunity to open it up and have a look! :-)

Ok so from that pic, it looks like the lower nipple on the manifold opens up to the carb pump, but it also looks like it goes through to the manifold as well. Maybe thats how they are getting the reciprocating suck/blow action on the diaphragm. Very cool that it works because yes, the Saito gassers are converted glow engines and as such, dont get the same lube. Hence the high oil ratio.

Thanks for making the commitment to open it up and show use. I like the design and think that if the materials are of a good enough quality, it will make a more reliable runner than the Saito's.
Old 06-13-2019, 08:24 AM
  #1655  
acdii
 
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Oh I wouldn't say the saitos aren't unreliable running engines. I have an FG-11 that runs great, have 20 hours on it, had to do a valve adjustment and change the plug as it ran a little burbling at top end, but runs great after that. My problem is it takes so long to run fuel through it that I can't use gallons used for run time! I used 2 gallons, if that! It will fly for an hour on 12 ounces of fuel.
Old 06-13-2019, 03:17 PM
  #1656  
tyor
 
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Originally Posted by cathurga View Post
Haha Tyor....I see you couldnt resist the opportunity to open it up and have a look! :-)

Ok so from that pic, it looks like the lower nipple on the manifold opens up to the carb pump, but it also looks like it goes through to the manifold as well. Maybe thats how they are getting the reciprocating suck/blow action on the diaphragm. Very cool that it works because yes, the Saito gassers are converted glow engines and as such, dont get the same lube. Hence the high oil ratio.

Thanks for making the commitment to open it up and show use. I like the design and think that if the materials are of a good enough quality, it will make a more reliable runner than the Saito's.
I had open it before so I know how it was. just to show you The lower nipple is not going inn to the manifold only to the hole for the carb pump.

I think saito is just as reliable as ngh. I have one fg84r3 have had 2 fg19r3 in a 2 engine plane. And I have 2 fg14, all of them working with no roblem. running on 25:1 oil ratio
Old 06-14-2019, 08:55 AM
  #1657  
EFHANC
 
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Could you guys take a look at the NGH GF30 plumbing and tell us what is going on there ? It's definitely different compared to the 8cc larger NGH GF38 . What's up ?
Old 06-14-2019, 10:14 AM
  #1658  
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The NGH GF-30 has the same ring chamber surrounding the intake manifold below the carb to allow a connection to the crank case to allow pressure pulses to operate the fuel pump tho the hose for that is connected to the case at s different point. I don't recall whether the case is vented to take off blowby oil or not. Same system, different implementation. D.H.
Old 06-14-2019, 07:19 PM
  #1659  
EFHANC
 
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Found the flying giants thread on the GF30 breather , s737500 posted the photo with a factory drilled hole in the rocker box , wonder if it works.
Old 08-04-2019, 01:29 AM
  #1660  
cathurga
 
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Hey All,

ok, I eventually got one of these, and I have set the timing as retarded as it can go, looks to be around 32 Deg BTDC. Its not idling below 2300rpm or thereabouts. I have it mounted on a trainer that I use for running in engines, as its easy to fly, has big wheels on it so landing 'off piste' is not a problem.
When I got it, the first thing I did was set the timing, oiled up the rockers and the cam cear/lobes and noticed there were NO gaps in the valve clearance. Set it at 0.1mm...Anyway, after 2 flights, I opened up the rocker cover to check the valve clearances, and noticed the inlet has a HUGE gap from when I originally set it....opened up a LOT. I know engines need time to bed in, but this seems excessive... I also noticed that the entire valve/rocker assembly can move left/right! The bolt holding it on is tight, but there is still movement. Is this normal? I pulled out one of the pushrods and noticed there is some 'burring' on the end that goes into the guide....I sanded that down...also, after first flights, the rocker area is quite dry, the engine is mounted inverted, so should be getting lube..
For break in, I ran a tank of gas through it on the ground, using 20:1 Stihl HP mix...on an 18x8 prop. I did one of the flights with that prop, but its not enough pitch, so I have put a 18x10 on it, which is better, had more forward speed.
Not giving up on it yet, but I am a little unimpressed with this engine, but given that it cost less than half of a Saito FG40, am prepared to forgive it until I know its run in a bit...

Will keep flying it in this config, and will check gaps on valves and inspect in general....hopefully it improves...
Old 03-13-2020, 03:14 PM
  #1661  
dr.tom
 
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1290 idling
works Great, too bad I tasted Saito 21 4t on my Cub so will have to trade ngh and try Saito 40cc on my spitfire
But ngh works great, really cant see what could ne better with Saito, but just have to try it...




Old 03-13-2020, 03:29 PM
  #1662  
acdii
 
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Put a can muffler on and it will sound as good as a Saito, it has a nice bark because of the straight pipe though and will sound great on my P-61, whenever I get to build it.
Old 04-26-2020, 01:48 AM
  #1663  
Tom ling
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Originally Posted by dr.tom View Post
1290 idling
works Great, too bad I tasted Saito 21 4t on my Cub so will have to trade ngh and try Saito 40cc on my spitfire
But ngh works great, really cant see what could ne better with Saito, but just have to try it...

https://youtu.be/T5iSj9J1Mg8

https://youtu.be/gpKCo3Z_R98

https://youtu.be/BoUuXU2nYbA

https://youtu.be/BfnYRSQoEjM
hi mate Iím building the fw at the moment, did you find any issues in the build? It doesnít look like it wants to tip on its nose on taxi/takeoff which is nice. How was the 38 as a match for it?
regards Tom.

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