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General control line discussion => Open Forum => Topic started by: Phil Coopy on June 29, 2006, 10:16:41 AM

Title: ST51 NVA
Post by: Phil Coopy on June 29, 2006, 10:16:41 AM: When replacing the NVA in a FOX35 with a ST51 NVA should I turn the spraybar down to the diameter of the FOX35 spray bar or will it work as it comes out of the package. The ST51 spraybar installed looks as though it reduces the venturi area quit a bit.

Phil
Title: Re: ST51 NVA
Post by: RandySmith on June 29, 2006, 10:50:05 AM: Hi Phil

If you want the same power , break, and have the motor act the same you will need to turn down the ST spray bar

Randy
Title: Re: ST51 NVA
Post by: Phil Coopy on June 29, 2006, 02:08:58 PM: Thanks Randy! Thought there might be some secret trick burried there.
Title: Re: ST51 NVA
Post by: RandySmith on June 29, 2006, 02:29:39 PM: well one trick is to use a PA stainless FOX 35 NVA.
another is you can just file the sides of the ST flat instead of turning it down, when you turn down the Brass st to 127 thou it normally breaks when you tighten it

Regards
Randy
Title: Re: ST51 NVA
Post by: Phil Spillman on July 01, 2006, 08:46:28 PM: Hi, Here's another idea! If you just use the ST NVA as supplied you can then determine if you need to do anything else! I have used a non adjusted ST NVA in Foxes without noting any difference nor detriment! So my thought is to try the thing and then make up your mind! Phil Spillman
Title: Re: ST51 NVA
Post by: peabody on July 01, 2006, 09:00:09 PM: I'm wondering why the Fox isn't used?
Title: Re: ST51 NVA
Post by: Jim Thomerson on July 02, 2006, 07:33:25 AM: Back in the 70's-80's, I could not get consistant runs with the flat-end Fox NVA. I installed a ST NVA and intended to hog out the venturi, but never got around to it. ::) I was, on several occasions, accused of running an ST 46, so I would suggest try it stock, and then modify if you think it needs it. If you do, suggest you file the sides of the spraybar or hog the venturi.