http://groups.google.com/group/alt.autos?hl=en
Today's topics:
* Why not an engine-heated fuel injection system? - 3 messages, 3 authors
http://groups.google.com/group/alt.autos/t/9cf0936a30f95fc8?hl=en
==============================================================================
TOPIC: Why not an engine-heated fuel injection system?
http://groups.google.com/group/alt.autos/t/9cf0936a30f95fc8?hl=en
==============================================================================
== 1 of 3 ==
Date: Wed, Feb 3 2010 6:54 pm
From: jimp@specsol.spam.sux.com
In sci.physics 2.7182818284590... <tangent1.57@gmail.com> wrote:
> Suppose that the liquid fuel is allowed to circulate around the engine
> block without oxygen. This would heat up the liquid to more than one
> pressure, I'm sure. Also, a car engine operates at very high
> temperatures, often much more than 212 F. Let's assume that it works
> at 250 F.
Bad assumption; the temperatures inside an engine are far higher then
that.
> I would think that allowing the gasoline to heat up without oxygen to
> prevent combustion and eject inside the pistons at 2 atmosphere
> pressure is a natural fuel injector, with perfectly atomized fuel.
Most fuels boil at relatively low temperatures.
Ever heard of the term "vapor lock"?
How do you get 2 atmosphere pressure on the intake stroke where the pressure
is usually local atmospheric?
Getting 2 atmospheres would require one hell of a turbocharger, roughly
doubling the fuel flow to keep the mixture correct, and likely would result
in either a melt down of the engine or seizure from things spot welding.
> What's wrong with this idea? The only thing bad that I can think of
> is that the gas would rapidly expand inside the piston and partially
> condense, perhaps, which may offset my "perfectly atomized fuel
> charger idea".
Well, for starters, the fuel expands in the cylinder, not the piston,
and the vaporization of the fuel helps keep the temperature inside the
cylinder down so it doesn't melt.
Other than those few minor nits, why don't you try it on your car and get
back to us.
--
Jim Pennino
Remove .spam.sux to reply.
== 2 of 3 ==
Date: Thurs, Feb 4 2010 7:09 am
From: "Bill"
Actually this happens naturally in hot places like Arizona where it can
reach temperatures of 120 or more in the summer.
You get a condition called "vapor lock".
Actually they try to *cool* the fuel lines in these areas! (To prevent vapor
lock.)
"2.7182818284590..." wrote in message
> Suppose that the liquid fuel is allowed to circulate around the engine
> block without oxygen. This would heat up the liquid to more than one
> pressure, I'm sure. Also, a car engine operates at very high
> temperatures, often much more than 212 F. Let's assume that it works
> at 250 F.
>
> I would think that allowing the gasoline to heat up without oxygen to
> prevent combustion and eject inside the pistons at 2 atmosphere
> pressure is a natural fuel injector, with perfectly atomized fuel.
>
> What's wrong with this idea? The only thing bad that I can think of
> is that the gas would rapidly expand inside the piston and partially
> condense, perhaps, which may offset my "perfectly atomized fuel
> charger idea".
== 3 of 3 ==
Date: Thurs, Feb 4 2010 7:52 am
From: Uncle Al
"2.7182818284590..." wrote:
>
> Suppose that the liquid fuel is allowed to circulate around the engine
> block without oxygen.
It will pyrolyze, depositing varnish and char, and generating
particulates that clog conduits and form soot in combustion chambers.
> This would heat up the liquid to more than one
> pressure, I'm sure. Also, a car engine operates at very high
> temperatures, often much more than 212 F. Let's assume that it works
> at 250 F.
Wow. I can has engineering?
> I would think that allowing the gasoline to heat up without oxygen to
> prevent combustion and eject inside the pistons at 2 atmosphere
> pressure is a natural fuel injector, with perfectly atomized fuel.
Are ya gonna heat the gas tank, too?
A four-stroke auto engine has a compression ratio of about 8:1. Maybe
you should look up carburators and fuel injectors plus the engineering
of an efficient, nonpolluting engine and learn something about how it
all works.
> What's wrong with this idea? The only thing bad that I can think of
> is that the gas would rapidly expand inside the piston and partially
> condense, perhaps, which may offset my "perfectly atomized fuel
> charger idea".
You want the charge - air and fuel - to go in as cold as possible.
Look up why or learn some thermodynamics.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm
==============================================================================
You received this message because you are subscribed to the Google Groups "alt.autos"
group.
To post to this group, visit http://groups.google.com/group/alt.autos?hl=en
To unsubscribe from this group, send email to alt.autos+unsubscribe@googlegroups.com
To change the way you get mail from this group, visit:
http://groups.google.com/group/alt.autos/subscribe?hl=en
To report abuse, send email explaining the problem to abuse@googlegroups.com
==============================================================================
Google Groups: http://groups.google.com/?hl=en
No comments:
Post a Comment