[Spridgets] Gas Hole

Linda Grunthaner grunthaner at gmail.com
Fri Sep 28 04:31:34 MDT 2012


Dean, I don't understand the water injection of the farm tractors and WWII
planes why don't they stop because of the water? Is it because of the mist
not flow?
Lin

On Fri, Sep 28, 2012 at 12:17 AM, Dean Hedin <dlh2001 at comcast.net> wrote:

> On a normally aspirated, bone stock engine, water injection will only
> give a slight increase in fuel economy. 1% or 2%.
>
> But let's say you had a car with a big 300 hp V-8.
>
> Now let's say you removed that big 5.0L V-8 and replaced it with a small
> turbocharged 2.0L 4 cylinder.
>
> Next, water inject the turbo 4 cylinder and crank the turbo boost
> up to the point where you get 300 hp.
>
> Now you will see an appreciable improvement in fuel economy compared to the
> original V-8.
>
> Water injection raises the knock limit of the fuel.  If you adjust the
> engine to take advantage of that, you can then see an improvement in fuel
> consumption (or if you want, to get more performance).
>
> The important point being that you must supercharge or raise compression to
> take advantage of the water injection.
>
> This stuff was well researched during WWII.  There is an online archive of
> the NACA experiments with water injection that are fascinating reading.
>
> A lot of the WWII planes had water injection boost.  Old farm tractors also
> had water injection, mainly to raise the knock limit of the low quality gas
> available in the rural areas at the time.
>
> Jet engines can also get a boost from water injection.
>
> The downside to water injection is that you have to change the oil more
> often.
>
>
> -----Original Message-----
> From: spridgets-bounces at autox.team.net
> [mailto:spridgets-bounces at autox.team.net] On Behalf Of Kirk Hargreaves
> Sent: Monday, September 24, 2012 7:45 PM
> To: Spridgets
> Subject: [Spridgets] Gas Hole
>
> Gas Hole
>
> Water injection. . .
>
> http://www.youtube.com/watch?v=1vJerAkLhuY
>
> Thoughts?  The Spridge List is the list I go to for the best input out
> there!
>
> Kirk
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