Here is a variant on my washer injectors, similar to the washer deal but smaller,
It is actually two flat head cap screws , one of which has a small hole (2.5mm ) drilled down the centre , the ones I used were ¼” stainless , welded in two places to get the gap, then silver soldered to the copper pipe , this was just to test the theory , tig welded to ss pipe would be the way to go,
The engine in the video is NOT running but resonating, Interesting how the engine hums, this is a definite resonance 172 hz or thereabouts, I can feel the engine vibrating,
This is with the gas valve just cracked open and the injector just inside the cc , if I turn the gas up it stops humming, the dominant running frequency of this engine is 236 Hz ,
Maybe 172 hz is some submultiple , or just the natural harmonic frequency of the tailpipe or something ,
Radial Injectors update
Moderator: Mike Everman
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GRIM
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Radial Injectors update
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- hum.wmv
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- csk cap inj.wmv
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- F__capscrew injector_capscrew injector.pdf
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Re: Radial Injectors update
2nd video - the cops are already looking for you 
that's a very nice flame on that vid. Nicely spread out. Good work.
that's a very nice flame on that vid. Nicely spread out. Good work.
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larry cottrill
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Re: Radial Injectors update
Yes, I agree -- that looks like a really good performer.
L Cottrill
L Cottrill
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Re: Radial Injectors update
Thanks for the comments ,
There is a a PDF there in amongst the videos in the previous post that shows how i made this , I see that it has not been downloaded yet , it looks like a link to the photo ,
It is really very simple, the only machining necessary is the hole down the centre of the screw , this could be done with a drill press ,
I have another engine that has the washer injectors , and I fired it up the other day , and after my recent exploits with stingers, I realized just how good the throttle range was , will run down really low ,
A note might be that these style injectors only seem to work well when the inlet is in the centre of a round plate , 180 style , and the injector is actually JUST INSIDE the CC
I have the suspicion that the high speed radial gas flow is creating a kind of diaphragm or plug effect there just inside the cc /inlet transition, and another thing is that one is not shooting gas directly at the exhaust ,
There is a a PDF there in amongst the videos in the previous post that shows how i made this , I see that it has not been downloaded yet , it looks like a link to the photo ,
It is really very simple, the only machining necessary is the hole down the centre of the screw , this could be done with a drill press ,
I have another engine that has the washer injectors , and I fired it up the other day , and after my recent exploits with stingers, I realized just how good the throttle range was , will run down really low ,
A note might be that these style injectors only seem to work well when the inlet is in the centre of a round plate , 180 style , and the injector is actually JUST INSIDE the CC
I have the suspicion that the high speed radial gas flow is creating a kind of diaphragm or plug effect there just inside the cc /inlet transition, and another thing is that one is not shooting gas directly at the exhaust ,