[Vwdiesel] Additional fuel via carb(was Ron's VE)

[Bruce Brier]

Let's see if I got this right, but if I don't have it right and this is a
new idea, let's all split the millions of dollars we earn from this idea...

It's a low-compression ratio diesel engine that has some pressure cooker
technology. You still need the high-pressure fuel injection, but add a port
fuel injector from a gasser but not for gasoline... it's to add liquid water
into the intake charge. Instead of 19.5:1 compression ratio, just compress
about 15:1 or however much is needed to achieve compression ignition of the
diesel fuel. Why the lower comp ratio? Well, the water expands when it
vaporizes so you get more pressure from less physical compression. Obviously
you will want to have the ECU tune the water injection quantity so that you
still can achieve compression ignition over all RPM ranges.

Advantages I could predict (without a shred of evidence)... The slower
reaction with high-humidity air could yield better efficiency. It could also
reduce diesel clatter... (some folks will complain if it's eliminated
entirely). There could be a reduction of NOx at this lower compression
ratio. Exhaust temps could be lower for longer turbo longevity.

Disadvantages... Water tank another fluid to keep topped off and unfrozen
(Use blue windshield washer fluid as water source? Oops, that costs more
than diesel fuel). Water in the blow-by thru the piston rings mixing with
engine oil to create foamy colloid. Rust forming in turbo during cooldown.

Dr. Dotgain

> From: LBaird119 at aol.com
> Date: Thu, 15 Apr 2004 02:42:35 EDT
> To: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Additional fuel via carb(was Ron's VE)
> 
> BUT what if water vapour was injected?
> Heat would be absorbed by the expansion of the water and so maintaining safe
> operating temp???
> 
> I went to a seminar/got a book several years ago about getting better
> mileage.  One of the "simple" things was "water injection."  Instead of
> the old "bubbling bottle" or a spray injection his preference was actually
> for steam injection.  Or, what most call steam.  The idea was to use a
> washer pump and nozzle to spray under a shield over the exhaust then
> suck the vapor in the intake.  It's not quite full steam at that point so
> the added expansion helps control hot spots and adds extra power.
> Something about steam expanding more than the loss in volumt due
> to the heat it takes to make it or something along that thought.
> Loren
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