RE: [ihc] Turbo Binder Motors

[Steven Stegmann <steve.stegmann@xxxxxxxxxxxxx>]

Tom,

I was refering to fuel per unit work done.  mpg for
instance.  On a diesel a turbo will cut the amount of
fuel used for a given amount of work.

On a gasser you get more power but economy is worse
for a given engine.  The only way to increase economy
for a gasser is to run a way smaller motor and use the
turbo for that occasional burst of power you need.

Steve

--- Tom Harais <THarais@domain.elided> wrote:

> Steve:
> 
> Well now, wait a minute.  If by "efficiency" you
> mean energy output per unit
> of energy input (as in MPG) then I'd have to agree. 
> But if you mean
> volumetric efficiency, then I'd have to disagree.
> 
> A turbo normally increases volumetric efficiency on
> either a diesel or a
> spark ignition engine.  The difference is that on
> the diesel, the turbo
> increases the volume of air alone going into the
> cylinders.  Whereas on a
> spark ignition engine, the turbo increases the
> volume of air AND fuel.  But
> the diesel has a much broader range of fuel/air
> ratios that will function,
> compared to the spark ignition engine where the
> functional fuel/air ratios
> can vary only slightly above and below the
> stoichiometricaly correct one.
> Thus, a turbo pumping more air (increased volumetric
> efficiency) into a
> gasoline engine's cylinders creates a proportional
> need for more fuel as
> well for the engine to function.  Hence, more power
> output (torque/power)
> from the turbo boost but no improvement in
> efficiency measured as conversion
> of input energy (fuel) to output energy
> (torque/power) is realized.  
> 
> And that's my perspective! ;-)
> 
> Tom H., '76 Traveler