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Engine basics => Engine set up tips => Topic started by: frank mccune on October 01, 2016, 10:03:06 AM
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Hello All:
I need some suggestions as to how I may adjust the needle valves on these engines while they are running without losing body parts. Is there some type of "tool" that I may fabricate that may make this possible?
Tia,
Frank McCune
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You can remove the needle from the spray bar and plug the hole. Then put a remote needle assembly in the fuel line behind the engine. I have done this and it will work, probably as good as the Cub needle. Or, you could try to epoxy a hex nut to the needle and adjust it with a wrench from behind. I have a short thumb from adjusting tight clearance needles.
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They were made for kids with small fingers that could adjust them no problem. LOL
It was always neat to run them at dusk so you could see the glow in the cylinder exhaust ports. That slotted needle was always to tight or to loose. If you squeezed them down to where they did not turn in flight, they were hard to turn. If you left them loose they would change in flight. There was a happy medium though.
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In England we fly a lot of diesels. Silicon fuel tube is no good for this. We use a transparent plastic tube, and I have used a large bore bit of this, forced over the end of the O.K. needle and left as long as necessary. I used this on my O.K. 0.149 Perky.
You could plug the end with a bit of balsa or dowel of suitable size, to give it some "body", but I never needed this.