pining,twin plugging,etc...

[Carl Summers]

Shannen Durphey wrote:
> 
> Carl Summers wrote:
> 
> > Bruce Plecan wrote:
> > >
> > > Which brings up an interesting point, when improving
> > > ignition systems, sometimes you wind up running less
> > > timing.  Which means there is a better flame/reaction
> > > or it's burning faster initially?.  But, would that be a
> > > indication of a better VE?.  According to some the ideal
> > > plug gap would be .1", which would min the delay of the
> > > flame getting to be a large enough kernel to burn quickly
> > > though out the combustion chamber.
> > >  Bruce   Safety alert:  don't try and dry your foil lined
> > >               Cone Shaped Hats in a microwave. (specially
> > >               if there are traces of gasoline on it).
> >
> > Hiya Bruce,
> >     Is that what happened to my microwave???? but anyway.....The VE
> > doesn't have anything to do with spark timing.(I know I'm going to get
> > flamed on this one),,,,The quality of the quench and combustion chamber
> > design has to do with the timing.....in the theory world if we have a
> > faster burning fuel(less octane) we would theoretically produce max
> > horsepower if we were to fire after TDC,,,,considering flame speed and
> > combustion but all of us forget about stored load for which there is no
> > known formula for in rotating mass(that I know of,,,,maybe next
> > diy_efi?????)      When you push on a wall with 200lb's of force it
> > pushes back with the same amount and yet it did not
> > move,,,hmmmmmm,,,,but it is stored energy,,,,,same concept within an
> > engine,,,we are all concerned with achieving maximum cylinder pressure
> > at 15 ATDC,,,,nevermind I don't even want to get into this one,,,,,rod
> > length/stroke/rpm/torque gets way to crazy for me tonight.....sorry for
> > the babble........
> > -Carl Summers
> 
>   I find this fascinating.  More, more.
> 
> If you push on the wall and it pushes back, but nothing moves, you've
> created heat!  Energy dissipates into the air.  But I can never remember
> this one.  Do low hp street engines run warmer or cooler when the timing is
> retarded?  Think it's cooler until the engine is worked hard, then it has
> to burn more fuel to make the same amount of power. (I could be out on a
> limb here.).
> 
> Wouldn't stored load be called inertia?  I seem to remember doing some
> inertia equations in a physics class.  Can't remember the equations but I
> sure remember doing them.
> 
> Is there such a thing as a perfect combustion chamber shape?  Maybe for a
> perfectly consistent fuel?
> 
> Is this enough questions?
> 
> Shannen

Hi Shannen,
   As far as I know a Hemi chamber with a flat top piston is the most
burn efficient but it is impossible to completely scavenge,,,,very hard
to get 100% volumetric efficiency...So as always we have trade
offs....Canted valves and figure 8 chambers seem to be the best for
atmospheric intakes with high vacuum exhausts...but I'm just
babbling,,,,hey where's the flames.....
-Carl Summers