[TheForge] fire piston

[robert hensarling]

Demon, I hear you, thanks!  That's great!  Make one and show it to me, I'm 
easy  :o)  I used to have some old antique "semi-diesel" engines, still have 
a Deutz-Otto from 1920.  I was thinking some pamphlets I have on them states 
that the semi-diesels (need a boost, called a hot ball engine, heat up a 
pipe looking thing until it's red, then start the engine.  Combustion keeps 
the hot ball hot) were in the 400+ range, so that a pure diesel would be on 
up there.  200 sounds way to low, but I believe you, I'm a woodworker :o)
Robert

----- Original Message ----- 
From: "Demon Buddha" <osan at netlabs.net>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, June 06, 2006 5:56 PM
Subject: Re: [TheForge] fire piston


>
>
> robert hensarling wrote:
>> Wow, I'm having a hard time believing that.  Not saying you're wrong mind 
>> you, but the PSI to ignite diesel is pretty high, and even then some of 
>> the engines have glow plugs to assist in ignition.  I would love to see a 
>> video of the fire piston being actually used to start combustion, being 
>> like I am, then I'd believe it (well, maybe)  :o)
>
> Pressure to ignite diesel is only about 200-220 psi.  If we assume a 15:1 
> compression and beginning at standard pressure and temperature, you will 
> raise the pressure to 15 atmospheres or 220.5 psi.
> If your piston is precisely .1 sq inch in area, whacking the piston with 
> 22 pounds of force will compress the air to 15 atmospheres and you will 
> produce a lot of heat in a small volume.
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