NGH 38CC 4 stroke
#1651
#1654
Join Date: Jan 2007
Location: Dubai, UNITED ARAB EMIRATES
Posts: 500
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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.
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.
#1655
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.
#1656
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.
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 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
#1658
Join Date: Mar 2012
Location: , WI
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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.
#1660
Join Date: Jan 2007
Location: Dubai, UNITED ARAB EMIRATES
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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...
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...
#1661
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...
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...
#1662
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.
#1663
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
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
regards Tom.
#1667
Thank you, it will be my choice also. I see they have many parts, I will order also the silencer, a spare intake manifold and some gaskets. Didn't figure it out yet on what to mount it, maybe on a H9 30cc Beaver.
#1668
Join Date: Sep 2006
Location: farmington, NM
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i have one of these and was going to put it in a hangar 9 tiger 30cc , would this be enough for this plane? i dont know what the flying weight is of the tiger but i have seen anywhere between 16 and 22 pounds? thx i get 7000 rpm with a 19x8 and im going to try and get 7500 out of it
#1669
i have one of these and was going to put it in a hangar 9 tiger 30cc , would this be enough for this plane? i dont know what the flying weight is of the tiger but i have seen anywhere between 16 and 22 pounds? thx i get 7000 rpm with a 19x8 and im going to try and get 7500 out of it
#1673
Hmmm,
I just got an idea and I do not know why I did not thought about ...since I can...LOL
I will make a native 40BTDC that will allow the engine to run at that 40BTDC and still maintain a good low idle. Have to make a new curve and program the unit.
Well I guess I will not send that engine back tomorrow.
I will keep you informed.
Adrian
I just got an idea and I do not know why I did not thought about ...since I can...LOL
I will make a native 40BTDC that will allow the engine to run at that 40BTDC and still maintain a good low idle. Have to make a new curve and program the unit.
Well I guess I will not send that engine back tomorrow.
I will keep you informed.
Adrian
#1674
Help
Does anyone know where the timing lines are for the cam? I took it apart a nd am not sure. It looks like you put the magnate at the top then slide the cam in mark straight up.... is this right?
oh. Looks like TDC then slide the cam mark up?
oh. Looks like TDC then slide the cam mark up?
Last edited by coleboom; 05-12-2023 at 11:42 AM.
#1675
Help please
38cc ngh four stroke? I cannot find instructions anywhere. I took the cover off and rotated the engine. The cam pushed itself out, and I am unsure if it jumped time. I see no timing marks.