[Diy_efi] Re: davy lamps and

[Mike]

Interesting info and observations, thanks Phil


Regards from


Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
http://niche.iinet.net.au



At 07:43 AM 29/06/05, you wrote:

>On first glance it appears that the temperature of
>the metal and it's ability to cool a local zone below
>the ignition temp that would "prevent " the escape
>of the ignition source to the atmosphere.
>
>The dead zone in an IC engine can be more than 1 mm
>thick under some operating conditions.
>
>Still it seems that having a combustible mixture of
>methane in the air you're breathing can't possibly be
>good for you even if it doesn't ignite.
>
>
>In the same light the flame traversing the small holes
>in the plug would be moving quickly enough not to be
>quenched completely. Although I would recommend
>that they don't make the plugs out of metal.
>
>If the TMFB is 90% at 5 to 8 degrees ATDC with a bore
>diameter of 84 mm and a central plug that give an approx.
>propagation time of say
>
>6000 rpm = 10 mS per rev or 36 degrees of crank in approx. 1 mS.
>
>42 mm in 1 mS or 42 M/S or 151 kMHr (95 mph if you wish)
>
>As for pressure gradients, not sure what you mean.
>
>phil
>
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