Today's Message Index:
----------------------
1. 04:29 AM - Fuel pump cooling (Ralph E. Capen)
2. 06:24 AM - Re: Fuel pump cooling (FLYaDIVE)
3. 06:56 AM - Re: Fuel pump cooling (Ralph E. Capen)
4. 08:09 AM - Re: Fuel pump cooling (FLYaDIVE)
Message 1
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| Subject: | Fuel pump cooling |
For those of you that have installed a cooling shroud on your fuel pump, are you
using the entire inch diameter for the flange hole to steal the air? Is it
enough / too much?
I'm thinking I might open it the full inch and put inserts to reduce it...but then
how do I know what's enough.....
Ralph
Message 2
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| Subject: | Re: Fuel pump cooling |
Ralph:
The 1" size is perfectly acceptable. You can always make it smaller...
But, you can't make it bigger - BUT, don't forget, the exhaust area has to
be at least TWICE the AREA of the input. Area of a circle = 2Pi*R^2.
Barry
On Tue, Sep 11, 2012 at 7:27 AM, Ralph E. Capen <recapen@earthlink.net>wrote:
> recapen@earthlink.net>
>
> For those of you that have installed a cooling shroud on your fuel pump,
> are you using the entire inch diameter for the flange hole to steal the
> air? Is it enough / too much?
>
> I'm thinking I might open it the full inch and put inserts to reduce
> it...but then how do I know what's enough.....
>
> Ralph
>
>
Message 3
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| Subject: | Re: Fuel pump cooling |
Thanks Barry,
It always comes back to high-school math......
I'm thinking that since this has some official sticker on it, the inlet/outlet
areas have been optimized as you have described.
Making the inlet smaller will provide continued conformance to the criteria you
have listed.
Ralph
-----Original Message-----
From: FLYaDIVE
Sent: Sep 11, 2012 9:21 AM
Subject: Re: LycomingEngines-List: Fuel pump cooling
Ralph:
The 1" size is perfectly acceptable. You can always make it smaller... But, you
can't make it bigger - BUT, don't forget, the exhaust area has to be at least
TWICE the AREA of the input. Area of a circle = 2Pi*R^2.
Barry
On Tue, Sep 11, 2012 at 7:27 AM, Ralph E. Capen <recapen@earthlink.net> wrote:
For those of you that have installed a cooling shroud on your fuel pump, are you
using the entire inch diameter for the flange hole to steal the air? Is it
enough / too much?
I'm thinking I might open it the full inch and put inserts to reduce it...but then
how do I know what's enough.....
Ralph
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Message 4
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| Subject: | Re: Fuel pump cooling |
Ralph:
Do not become too concerned about vapor lock. Yes, some of the stories you
hear are true, but many more are exaggerated. The best things you can do
towards its prevention are:
1 - Point the plane into the wind after shutdown.
2 - Open all cowl flaps (if any)
3 - Open the oil door
4 - Turn on and take off with boost pump ON.
5 - Leave boost pump ON until you reach a safe altitude.
6 - The rest is all dependent upon your building practices - The routing of
fuel lines and Fire Sleeves, as mentioned.
I would NOT reduce the size of the SCAT tube any smaller than 1". Volume
of air flow is NOT only dependent upon size of the tube but also the Flow
Dynamics of the tube. This means internal turbulence and restrictions
[bends, obstructions, roughness, corrugation and input & output
restrictions]. And, if you really want to explore the dynamics of this -
Look up Open and Closed end Resonance. I know, I know, way more
information than needed ;-)
Barry
On Tue, Sep 11, 2012 at 9:53 AM, Ralph E. Capen <recapen@earthlink.net>wrote:
> recapen@earthlink.net>
>
> Thanks Barry,
>
> It always comes back to high-school math......
>
> I'm thinking that since this has some official sticker on it, the
> inlet/outlet areas have been optimized as you have described.
>
> Making the inlet smaller will provide continued conformance to the
> criteria you have listed.
>
> Ralph
>
>
> -----Original Message-----
> From: FLYaDIVE
> Sent: Sep 11, 2012 9:21 AM
> To: lycomingengines-list@matronics.com
> Subject: Re: LycomingEngines-List: Fuel pump cooling
>
> Ralph:
>
>
> The 1" size is perfectly acceptable. You can always make it smaller...
> But, you can't make it bigger - BUT, don't forget, the exhaust area has to
> be at least TWICE the AREA of the input. Area of a circle = 2Pi*R^2.
>
>
> Barry
>
>
> On Tue, Sep 11, 2012 at 7:27 AM, Ralph E. Capen <recapen@earthlink.net>
> wrote:
>
> recapen@earthlink.net>
>
> For those of you that have installed a cooling shroud on your fuel pump,
> are you using the entire inch diameter for the flange hole to steal the
> air? Is it enough / too much?
>
> I'm thinking I might open it the full inch and put inserts to reduce
> it...but then how do I know what's enough.....
>
> Ralph
>
>
> ==========
> nes-List" target="_blank">
> http://www.matronics.com/Navigator?LycomingEngines-List
> ==========
> http://forums.matronics.com
> ==========
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution
> ==========
>
>
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