SpudFiles

I wouldn't be worried about "dieseling" when adding air, i only ever used my bbq ignitor up to 9x mixes so i can not say for sure about 25x, the gap i used at 9x was around .75mm, so at 18x the gap would be .375mm, pretty hard to measure.
I would try if i were you to make a pump that would get you up to pressure with one measured stroke, no need for a guage then.

It won't be an easy task but i think it could be done wth a lot of patience, good luck Jean.

hi

yes one pump stroke per fill or 1 stroke to fill 2x, 2 stroke 4x .......

today i found in my personel"pot of gold" this brass fits!

jean

Wait a moment... If it's one stroke per BAR, then that means one stroke for 2x, and two strokes for 3x... not 4x. Remember, the chamber starts with a 1x mix, and supposing each stroke gives the 14.somthing psi needed, (or one bar), then its just number of strokes + 1 = mix.

hi
i mean per stroke 2 bar (29 psi).
pump volume double than the chamber.
i see in the chamber is no fuel bevor the first stroke! but i don´t know it is a problem

jean

How are you planning on fueling it jean. It sounds as though you are mixing the fuel with air before pumping the chamber to pressure with said pre-mixed fuel-air. Sounds like a good idea to me if that is the case.

hi

yes
first i will use a syringe instead of a pump to test all (seal, combustion, piston work, inigtion.....)
after i will build an fuel sytem like the "firestorm omega" visualised in Theories/Accessories Database ( http://www.spudfiles.com/forums/firesto ... 14507.html ) conformed to hybrid.

1. mixing the fuel in pump
2. pump in chamber to xbar
3. inigtion

mh but i dont know how essential it is to vent the chamber after every shot!?
i hope it is not so important at 5x, 10x or 20x.....

today i change the solder fitting to pump (pump id now 20mm) and attach the barrel ( 5mm id brass tube).
its not so easy as i wish.... drill out a 1/8 plug but a little out of square
next day i will a secend try.
yesterday i order ptfe material for piston and checkvalve. i hope thats the right material to use in this place.

irgentwelche deutschen user hier die mir beim übersetzen helfen können?

jean

Jean, are you german, french or english?

german .. sry for bad english

No probs! i'm not english either! Ich kann nur ein bischen deutsch sprechen...aber, ich glaube, daß es andere Mitglieder gebe, die sprechen deutsch!! guten abend

Ich kippe spreche Deutsches .....

I don't thinking venting will be much of a problem, you may have to adjust the fuel mixture a little bit to make it leaner after the first shot.

I have always wanted to make a hybrid plinker too! In NZ fittings cost MUCH MUCH more. I was thinking of using 0.8mm tubing (steel I think) from the hobby store and welding some how... Copper would be so much easier...