EHVH Mk 1-(warning large pictures)

[frankrede]

you should grind down those corners

I should not.
The flat edge holds it straight and works as a base.

[TwitchTheAussie]

Just to be safe I'd MIG weld everything. Just to be safe. Other than that use a remote detonator and be careful with the spark plugs.

[DYI]

Did you read the entire topic Twitch?
The whole thing is MIG welded.

And what mixes do you plan on taking it to frank? It looks like it could take 20x easily.

[frankrede]

Thats exactly what I have in mind.
Or atleast to the highest mix I can take it too with my air compressor

[DYI]

With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper.

[frankrede]

With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper.

Yea. I knew it was something crazy. I would figure something out.

[SpudBlaster15]

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[Novacastrian]

With everything accounted for, assuming excellent fueling techniques, 20x would be about 290 psi preignition. That must be one impressive compressor. If you have a normal compressor however, you could pressurise a tank with a homemade high pressure pump for the air source. Either that, or a regged HPA tank, but I think the first option would be cheaper.

Ok, i know that propane CAN start to turn liquid at around 90psi, having said that i have fueled my mini hybrid to 90psi with no troubles.
My question is this- at 290psi what is the chance of non-liquification?

Btw, great idea with the pre-pressurised tank DYI, i was looking for a simple way to pressurise hybrids in the field.

[spanerman]

would keeping the chamber warm or cold, can never remember reduce the chances of liquification?

[DYI]

Due to the low propane:air ratio, I'm pretty sure that partial pressure would stop the propane from liquifying at any easily achievable mix. I don't know for sure though. I do know that a 20x mix would be really impressive.

[mark.f]

Some say that because of partial pressures, the propane will not liquefy in a propane:air mixture past 90 PSIG. They say it will take around 2,143 PSIG to liquefy it in a 4.2% mix. Don't know that for a fact, though.

[DYI]

Assuming that the pressure in a propane tank is around 110 psig, the limit imposed by that is a 183x mix, which would equate to ~2790 psig.
If we also assume that the partial pressure argument is correct (which I suspect it is, due to _Fnord's 11x tests), then it seems as though about 141x is the limit. I wonder what kind of pressure a 100x mix would generate?

[spanerman]

more than id want to be within a mile of

[DYI]

I'm guessing over 10kpsi in adiabatic conditions. Dammit, now you've got me wanting to build a 20x oxy/MAPP hybrid...

[spanerman]

^thank god your on a different continent to me