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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