"Sweet Spot"

[Eric Aos]

> 
> 'course if you did this the magnitude of the peak pressure would
> necessarily be lower...
> 

That's the easy answer.... what if the chamber were in fact a piston
???? it's stroke set to chase the first piston down the bore until the
desired number of degrees ATDC, then ignite the mixture? You could
incorporate 2-stroke porting, and get rid of the valves all together.
Lesse, 228% per power stroke, and a power stroke every revolution...
might be worth the extra mechanics.

> 
> On Fri, 18 Jun 1999, Eric Aos wrote:
> 
> > > If you set up a series of tests such that the only thing that 
> > > varied was the
> > > spark advance,  and you moved it such that the pressure peak 
> > > varied from 10 to
> > > 20 degrees atdc
> > 
> > Just imagine for a moment though if you could change that 
> to 73 degrees
> > (for a 350 Chevy 3.48 stroke, and 5.7 rod) this is where leverage is
> > maximum (90 deg between rod, and crank throw). For a 228% 
> increase in
> > leverage... 
> > 
>