Rotating needle valve

John Goddard Tue Feb 28, 2012 3:32 am

In my quest for MORE power for the Old Timer I've now put a new td top end on it.
I'm going to take a little more time running this one in (at least 4 tanks Ha) but
the NV appears to be seeking a career of it's own so even if I wanted to lean it down
the blinking thing keeps rotating anti clockwise.
!, I'm counting my blessings it ain't going the other way.
2. What's the best way to make it stay put?

'Power M M Mad I tell ya' Johnnie
Very Happy

**Cribbs74** Tue Feb 28, 2012 7:21 am

Balance the prop!

Just kidding, either the spring is worn or the NV itself. That would be my guess

**RknRusty** Tue Feb 28, 2012 7:26 am

I always remove the spring and replace it with a washer and a short piece of silicon fuel tube, It keeps the needle from moving and it seals the inevitable air leak around the threads.

Rotating needle valve Showatt

I use a thicker tube now. It lasts longer and seals better. Here it is in the background
Rotating needle valve 1126111739

Here it is with the needle closed
Rotating needle valve 1126111735

I wouldn't even run an engine with the spring. This is the only way to go. It will run much better without air trickling past the threads

mitchg95 Tue Feb 28, 2012 9:03 am

John Goddard wrote:In my quest for MORE power for the Old Timer I've now put a new td top end on it.
I'm going to take a little more time running this one in (at least 4 tanks Ha) but
the NV appears to be seeking a career of it's own so even if I wanted to lean it down
the blinking thing keeps rotating anti clockwise.
!, I'm counting my blessings it ain't going the other way.
2. What's the best way to make it stay put?

'Power M M Mad I tell ya' Johnnie

yeah get rid of the spring for the needle valve, and replace it with a #4 washer and medium size fuel line as rknrusty suggested

John Goddard Tue Feb 28, 2012 9:04 am

Great advice as always gents.
I'll balance prop just in case (engine's had less than 10 tanks so not old) and I'll Rustyise the needle
then report back.
Best
J
Cool

mitchg95 Tue Feb 28, 2012 9:06 am

John Goddard wrote:Great advice as always gents.
I'll balance prop just in case (engine's had less than 10 tanks so not old) and I'll Rustyise the needle
then report back.
Best
J

i have done the needle valve+medium fuel line with good results, good luck

**RknRusty** Tue Feb 28, 2012 9:34 am

John Goddard wrote:Great advice as always gents.
I'll balance prop just in case (engine's had less than 10 tanks so not old) and I'll Rustyise the needle
then report back.
Best
J

I have read that you should always run-in the engine with the prop and fuel you intend to primarily use in the field. I've found my engines don't like changing fuel.

Sponsored content

Rotating needle valve

Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve

Re: Rotating needle valve