Simmering the gasoline and injecting the gaseous vapors into the pistons

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Stem sells - 30 Jul 2007 18:19 GMT

Suppose that our fuel tank was very safe, and 100% safe from
explosions.

Instead of fuel injectors, why not heat up the fuel, and pump this
high pressure gaseous vapor into the pistons?

Currently, liquid gasoline is sprayed into the pistons. From what I
understand, the finer the mist, the better and more thorough the
combustion.

Since the gaseous gasoline is the limit to how finely you can atomize
the gas, I would think that this is the most optimum way to put gas
into the cylinders.

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Uncle Al - 30 Jul 2007 18:46 GMT

> Suppose that our fuel tank was very safe, and 100% safe from
> explosions.

"Az di bobe vot gehat beytsim volt zi geven mayn zeyde."
Do you have three grandfathers?

> Instead of fuel injectors, why not heat up the fuel, and pump this
> high pressure gaseous vapor into the pistons?

Because there are nonvolatile additives? Because gas is ~1000 times
less dense than its liquid? Because the Second Law of thermodynamics
exists and PV = 101.325 J/liter-atm? Because it's a stupid idea?

> Currently, liquid gasoline is sprayed into the pistons. From what I
> understand, the finer the mist, the better and more thorough the
> combustion.

Learn something about cylinder combustion engineering. Learn
something about bullshit Enviro-whiner natural gas and propane
vehicles.

> Since the gaseous gasoline is the limit to how finely you can atomize
> the gas, I would think that this is the most optimum way to put gas
> into the cylinders.

That is why we have engineers who can measure, calculate, design,
manufacture... and optimize.

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jimp@specsol.spam.sux.com - 30 Jul 2007 19:05 GMT

In sci.physics Stem sells <gestureofrespect@yahoo.com> wrote:

> Suppose that our fuel tank was very safe, and 100% safe from
> explosions.

Irrelevant to what follows, but maybe you are having a slow day.

> Instead of fuel injectors, why not heat up the fuel, and pump this
> high pressure gaseous vapor into the pistons?

Fuel injectors do heat up the fuel because it is being pumped.

> Currently, liquid gasoline is sprayed into the pistons. From what I
> understand, the finer the mist, the better and more thorough the
> combustion.

That is the whole point of fuel injection.

> Since the gaseous gasoline is the limit to how finely you can atomize
> the gas, I would think that this is the most optimum way to put gas
> into the cylinders.

While we're at it, let's add some sensors such as power demand and
combustion efficiency and control the injectors in real time.

Oh, wait, modern fuel injection already does that.

You don't get out into the real world much, do you?

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Jim Pennino

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smallpond - 30 Jul 2007 20:21 GMT

> Suppose that our fuel tank was very safe, and 100% safe from
> explosions.
[quoted text clipped - 9 lines]
> the gas, I would think that this is the most optimum way to put gas
> into the cylinders.

Your question boils down (ha!) to whether gasoline vapor would be
better to use as a fuel than a gasoline aerosol, where better means
to release the greatest amount of net energy. Existing
engines leave some fuel unburned and consume some energy in
heating the liquid to the point of ignition. Your proposal to preheat
and vaporise the gasoline makes sense only if it consumes less energy
than it returns in greater efficiency. It also needs to be practical:
for
example, you alluded to the need to prevent early ignition of hot
gasoline
vapor (variously called "knocking" or "explosive destruction of
vehicle"
depending on severity).

To take it to the next level, determine the efficiency of existing
engines
and the proposed efficiency. Use the correct units: J/Kg would be
incorrect.
Use MPG to attract investors.
-- S

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