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Old Mar 22, 2014, 01:14 PM
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I expected to be able to determine a base map by runups and monitoring that would be better than fixed mixture. These small engines may be tricky.
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Old Mar 25, 2014, 08:27 AM
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Canada, ON, Hanover
Joined Jul 2011
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I wouldn't have the patience for that, I would just buy a picospray, bolt on efi unit as soon as they are available, or there is another company called ecotron that has them also but they are hugely expensive I think around 399.99 for the kit

http://www.ecotrons.com/products/sma...injection_kit/

an interesting article for picospray:

http://www.popularmechanics.com/cars...etors-15682450
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Old Mar 25, 2014, 08:33 PM
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All you really need to do for a reasonable start is set points on a throttle curve memory array. Run the engine at the throttle points, adjust the mixture for optimum burn, then enter the temperature and needle position into memory. Then the trick is to know which side of the error you are on, and correct if needed. The creep and peep method may not be fast enough, and the temperature probe may not respond fast enough either.

I have mentioned, larger snowmobile and ultralight engines have a needle that follows the throttle, and it is shaped to optimize the mixture at most throttle positions.

This could possible fix those awful rough places along the throttle curve that make you worry the motor could quit.

I need to dig into it and then I'll get it if it is able to improve how these motors run, terrible sounding to me.

Looks like back surgery is on review after the MRI I had. It's getting so bad I'm doing well to stand and walk. So now I go the a consult for surgery. I may be able to get some work done after that, but I have heard lots of not so good stories about spinal surgery.
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Old Mar 25, 2014, 10:08 PM
Complete RC Idiot Savant
The Netherlands
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Originally Posted by Chophop View Post
Looks like back surgery is on review after the MRI I had. It's getting so bad I'm doing well to stand and walk. So now I go the a consult for surgery. I may be able to get some work done after that, but I have heard lots of not so good stories about spinal surgery.
I really wish U good luck on that part, that fuel mixture thingy is of lesser importance....

Brgds, Bert
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Old Mar 26, 2014, 01:56 AM
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Oh, it's only a surgery. Not as if he were going to pull out a chest hair and everything else that follows.
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Old Mar 26, 2014, 02:48 AM
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Oh, it's only a surgery. Not as if he were going to pull out a chest hair and everything else that follows.
I feel your pain chopchop. If it wasn't for the pain pills I couldn't get of bed . Your lucky in that surgery is a option . There not the butchers that everyone makes out and generally won't do anything unless their sure its gonna help but one things for sure your back is never going to be the same . I have 3 dodgy discs in the back and 1 in the neck and if surgury was an option I would run over a nun to get to the hospital . Make sure your happy with your doctor and specialist and if not pi$$ em off until you find one your happy with . Good luck with everything I think your gonna be out of action for awhile but there is light at the end of the tunnel. Cheers the pope .
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Old Mar 26, 2014, 07:07 AM
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Thanks. Some readers have been hearing of my back problems over a few years, so I thought I'd announce it is being evaluated again, MRI shows worsening problems.
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Old Mar 26, 2014, 07:13 AM
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good luck to you chophop here is hoping everything goes well in the future
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Old Mar 26, 2014, 03:16 PM
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Give me a pair of pliers. I'll squeeze your thumb with them awhile then let go , to show how that works for improving the sense of well being.
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Old Mar 26, 2014, 05:04 PM
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guys im trying to find some info on the NGH 25 but not having much luck. Any opinions?
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Old Mar 28, 2014, 11:17 PM
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Originally Posted by ncflyer79 View Post
guys im trying to find some info on the NGH 25 but not having much luck. Any opinions?
I don't know anyone that used one. But it uses a Walbro carb clone, so the carb is easy to rebuild if needed. But the engine works pretty good. The connecting rod does not have needled bearings so you still need to use a 20:1 fuel to oil ratio when new during run in and maybe can go to 25:1 after it has a few hours on it. I also suggest using a really good synthetic oil such as Stihl HP Ultra for example. Do not use the inexpensive oils or the rod may fail.

Here is a review of it here http://christiantraders.com.au/conte...l%20Engine.pdf
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Old Apr 09, 2014, 08:36 PM
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earlwb, how did the 9cc ngh engines work out?
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Old Apr 09, 2014, 09:49 PM
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Well, the ones I am using work for me. Two engines are stock and the third one has a Walbro carb on it. Unfortunately a lot of other people were having trouble with the pump/regulator unit though. Actually I had trouble with them until I more or less figured out ways to make them work OK. So I guess it depends on the person and their luck and or skill. The carburetors are sort of screwed up, but they work if you use the 1/2 open as idle speed from there to WOT. Trying to make the carb work more normally just doesn't work. It might if the needles are reworked, but I never bothered to try though.
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Last edited by earlwb; Apr 09, 2014 at 09:51 PM. Reason: add more info
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