REFLECTOR: Primer Nozzles
Carl Hoffman
hoffman3 at erols.com
Sun Aug 21 09:02:47 CDT 2011
John,
I'm based at Morristown (MOR) 32 miles NE of Knoxville. I had to go
around bad weather to get to OSH. It took me 4 1/2 hrs and 47 gals.
Getting back was 3 1/4 hrs and 34 gals.
Carl
aminetech at bluefrog.com wrote:
> Carl,
>
> I wanted to go and take the family. We camp and the weather didn't
> cooperate. I fly over Knoxville on my trips between MS and NY. I
> keep looking for you, but haven't seen you yet. ha
>
> I have the auto prime set up and plan to try it tomorrow.
>
> John
>
> --- hoffman3 at erols.com wrote:
>
> From: Carl Hoffman <hoffman3 at erols.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Primer Nozzles
> Date: Sat, 20 Aug 2011 18:46:47 -0400
>
> John,
> Ditto on that. Missed you at Oshkosh.
> Carl Hoffman
>
>
> Michael Watson wrote:
>
> John I have the Franklin fuel injector rails on the lower side of
> both intake manifolds. (six injectors)
> They both connect to a solenoid then to the electric fuel pump.
> Pre start is fuel pump on, press prime
> for 3 seconds (turns on the solenoid) fuel pump off then start.
> works like a charm. I only have to prime
> on the first start of the day, after stops for an hour or more, it
> will fire right up without priming.
>
>
>
> On Sat, Aug 20, 2011 at 12:16 PM, <aminetech at bluefrog.com
> <mailto:aminetech at bluefrog.com>> wrote:
>
> Larry,
>
> Yeah, I'm also thinking that a little fuel could be drawn in.
> I think it won't be significant, but even if it is, the worst
> case is that I have to wait 10 minutes to start. What I like
> about it is eliminating the guesswork about how much to prime.
>
> John
>
> --- lwcoen at hotmail.com <mailto:lwcoen at hotmail.com> wrote:
>
> From: "Laurence Coen" <lwcoen at hotmail.com
> <mailto:lwcoen at hotmail.com>>
> To: "Velocity Aircraft Owners and Builders list"
> <reflector at tvbf.org <mailto:reflector at tvbf.org>>
> Subject: Re: REFLECTOR: Primer Nozzles
> Date: Sat, 20 Aug 2011 10:51:57 -0500
>
> John,
>
> Your new arraignment sounds like what I did. Attaching the
> primer solenoid to the starter power may have unintended
> consequences. Even with the aux pump off the open solenoid
> valve will still allow fuel to be drawn in due to the negative
> pressure in the manifold. I guess I'm just a "Nervous Nellie"
> when it comes to making things automatic.
>
> Larry Coen
> N136LC
>
> From: aminetech at bluefrog.com <mailto:aminetech at bluefrog.com>
> Sent: Saturday, August 20, 2011 7:50 AM
> To: Velocity Aircraft Owners and Builders list
> <mailto:reflector at tvbf.org>
> Subject: REFLECTOR: Primer Nozzles
>
> I had plain elbow fittings instead of nozzles and decided to
> convert to nozzles. I'm amazed how tiny the opening is on the
> nozzle (# 76 drill size). The tubing side connection is fine
> thread which can't be used with the coarse thread compression
> fittings on my tubing lines, so I made nozzles from the plain
> elbow fittings by inserting a piece of brass sheet metal held
> in place with structural adhesive and drilling a # 76 hole. I
> also moved the fittings from the 1 and 2 cylinders to the
> middle ones. Before installing, I connected to the fuel lines
> and had someone press the primer button. I was expecting to
> see a spray, but it was a mostly coherent stream of greater
> volume than I expected from such a tiny hole. It shot up
> about 6 inches which means fuel is getting right at the back
> side of the intake valve. The engine fired the instant I
> engaged the starter. I'm thinking of making the priming
> automatic by powering the primer solenoid from the starter +
> terminal. The only time I don't need priming is when the
> engine has been off for less than 10 minutes and I think I can
> "turn off" the primer by simply not turning on the electric
> fuel pump.
>
> John
> ------------------------------------------------------------------------
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>
> --
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS HX Synthetic Vision
>
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