REFLECTOR: Primer Nozzles
Carl Hoffman
hoffman3 at erols.com
Sat Aug 20 17:46:47 CDT 2011
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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