pining,twin plugging,etc...

[Joe Boucher]

>
>
> Is there such a thing as a perfect combustion chamber shape?  Maybe for a
> perfectly consistent fuel?
>

There was actually an interesting theory article in "Hot Rod" a couple of years
ago.  I was shocked.  One of the ideas the author proposed as a research
project was slant milling a Chevy small block head to achieve as small a head
chamber as possible and use deep dish pistons to bring the compression ratio
down to a realistic level.  The idea was to try to obtain as close as possible
a hemispherical combustion chamber shape.  The one problem Carl pointed out
might be pushing out the exhaust gas.

This caused me to think about how a burn will happen in a combustion chamber.
If you provided an ignition source in the middle of a large chamber filled with
an explosive mixture, it would burn in a hemispherically expanding pattern.  A
spark plug cannot have it's gap sitting out in the exact middle of a chamber,
for no other reason than it would become too hot and cause pre-ignition.  Since
the gas will want to burn hemispherically, a possibly optimum shape would be a
flat top head and dished piston with the gap just protruding from the top of
the chamber surface.  The idea is to obtain half of a hemisphere.  This occured
to me when the article talked about how pop-up pistons are not good because the
flame front has to travel up and over the piston dome.  This can't be an
original thought and there are physical problems such as the valve placement
and bending the manifold passages to flow into this arrangement.


> Is this enough questions?

No

>
>
> Shannen

Joe Boucher
'70 RS/SS Camaro  '81 TBI Suburban
I wore this cone shaped hat into this bar and the officer said .... Um,  He
said .....
Oh, the hell with it.
Forget it