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Engine basics => Engine set up tips => Topic started by: kevin king on January 23, 2023, 10:49:16 PM

Title: Replacement needle valve assemblies
Post by: kevin king on January 23, 2023, 10:49:16 PM

Nice. The replacement fox nva are good to know too!

Title: Re: Replacement needle valve assemblies
Post by: Dennis Toth on January 24, 2023, 07:46:20 AM

These will work but they require the venturi area a bit so you get better fuel draw be less power then the ones that Randy S sells that have the same end diameter but a reduced center to match the original FOX NVA diameter.

Best,   DennisT

Title: Re: Replacement needle valve assemblies
Post by: Steve Helmick on January 25, 2023, 12:03:27 PM

Looks like they include some sort of plastic washers for each end. Maybe that works, but I tried that (not with RSM plastic washers), and the entire spraybar turned when I was adjusting the NV. Not what you want, OBTW.  n1 Steve

Title: Re: Replacement needle valve assemblies
Post by: Chris Lambdin on February 02, 2023, 04:08:51 PM

Does Randy Smith still sell his PA NVA for the fox?

Title: Re: Replacement needle valve assemblies
Post by: Joe Ed Pederson on February 03, 2023, 01:04:35 PM

Quote from: Chris Lambdin on February 02, 2023, 04:08:51 PM

Does Randy Smith still sell his PA NVA for the fox?

No, he doesn't.   I called and asked him before Christmas.

Joe Ed Pederson

Title: Re: Replacement needle valve assemblies
Post by: Peter in Fairfax, VA on February 04, 2023, 06:02:40 PM

My original Super Tigre NVA Fox 35 ran great.  If drilling the case to get it in was needed, and it restricted the venturi a bit, I didn't mind.  Fuel draw, economy were great.  I miss that engine.  Also had a good fitting chip muffler.  Probably a 50th or 60th Anniv.  Thought I'd never fly Fox 35 again.  Now I am rigging advanced trainers setup for Fox.

Back to the NVA, I'd say an original Super Tigre or an RSM would be fine, even an Enya if that's your style.

Peter