Testing spray pattern on turbine injectors

[Juan Jimenez[_1_]]

I'm in the middle of cleaning the injectors of the engine on my BD-5J, and I
was wondering if someone here has dealt with this issue before...

I need to test spray pattern. The engine has 8 injectors. I know I can set
up a rig where I pump fuel into the injectors, and perhaps use a piece of
cardboard 12 inches from the injectors to see what the spray pattern looks
like after a shot of fuel. I would be looking for uniformity of pattern from
all injectors.

Am I missing something else I should look for?

Juan



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[paul]

On Wed, 11 Oct 2006 14:06:13 -0400, "Juan Jimenez" >
wrote:

>I'm in the middle of cleaning the injectors of the engine on my BD-5J, and I
>was wondering if someone here has dealt with this issue before...
>
>I need to test spray pattern. The engine has 8 injectors. I know I can set
>up a rig where I pump fuel into the injectors, and perhaps use a piece of
>cardboard 12 inches from the injectors to see what the spray pattern looks
>like after a shot of fuel. I would be looking for uniformity of pattern from
>all injectors.
>
>Am I missing something else I should look for?
>
>Juan


Years ago while in the USAF as a jet engine mechanic we used a stand
where the nozzles were screwed into a fixture vertical with a clear
Plexiglas panel over the nozzles approximately 6" which allowed us to
inspect the spray pattern, if one was off we immersed the injector in
a de carbon mixture and retried the pattern. One thing that you should
remember is the injector tips are fragile, if you must attempt to
remove any hard deposits use a orange stick or a tampico brush. Good
luck, please remember this is how it was done in the 60's perhaps a
newer and better method has been devised

[Juan Jimenez[_1_]]

"paul" > wrote in message
...
> On Wed, 11 Oct 2006 14:06:13 -0400, "Juan Jimenez" >
> wrote:
>
>>I'm in the middle of cleaning the injectors of the engine on my BD-5J, and
>>I
>>was wondering if someone here has dealt with this issue before...
>>
>>I need to test spray pattern. The engine has 8 injectors. I know I can set
>>up a rig where I pump fuel into the injectors, and perhaps use a piece of
>>cardboard 12 inches from the injectors to see what the spray pattern looks
>>like after a shot of fuel. I would be looking for uniformity of pattern
>>from
>>all injectors.
>>
>>Am I missing something else I should look for?
>>
>>Juan
>
>
> Years ago while in the USAF as a jet engine mechanic we used a stand
> where the nozzles were screwed into a fixture vertical with a clear
> Plexiglas panel over the nozzles approximately 6" which allowed us to
> inspect the spray pattern, if one was off we immersed the injector in
> a de carbon mixture and retried the pattern. One thing that you should
> remember is the injector tips are fragile, if you must attempt to
> remove any hard deposits use a orange stick or a tampico brush. Good
> luck, please remember this is how it was done in the 60's perhaps a
> newer and better method has been devised

Believe it or not, another BD-5J owner uses this EXACT same method. Deja vu.
:)



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