Re: Spark experiment under high compression

[Jon Pike <jhpike@domain.elided>]

> Is it related directly to pressure, or does it relate to temperature
> (because of pressure) or due to some sort of variation in the mixture
> atomization because of the different pressure?
Pressure pretty much is the function here.  Higher pressure = denser 
gas,  and the denser it is the higher
the voltage it takes to jump the same gap.  Like Fred determined.. it's 
a basic Physics fact.

So if you have higher compression,  turbocharge or supercharge,  use a 
cold air ram intake,  or
put a leafblower fan in front of your air filter...  you will to a 
larger or smaller amount, (well, I don't
know about that last one! ) ;-)  increase your net pressure before 
ignition,  and require a larger
striking voltage for that plug gap.   Also, for the same engine,  going 
from idle to high speeds will
to a point,  put more volume into the cylinder,  for a higher pressure.. 
which is why at high RPM,
you may need a better ignition system.  (one of a few reasons, anyway)

Ususally you have quite a lot of excess voltage..  and the standard 
system can cope with it.

Hope it helps...

Jon
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