Water Injection Question

I have a completely stock 1998 Nissan Frontier 4 banger and heard that
water injection works to increase MPG. Is that true?

On 4 Oct 2005 22:56:22 -0700 wrote:

> I have a completely stock 1998 Nissan Frontier 4 banger and heard that
> water injection works to increase MPG. Is that true?

If so, everyone would be doing it.

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wrote:
> I have a completely stock 1998 Nissan Frontier 4 banger and heard that
> water injection works to increase MPG. Is that true?
>

The water injection itself will not change mpg. However, an increased
compression ratio will increase efficiency and mpg, but at expense of
higher octane demand. Water injection raises effective octane of fuel.
But to take advantage of it, you'd need to increase CR. That is not a
trivial job. Further, if you live in climate where it goes below
freezing in winter, you must use a water/alcohol or water/glycol
mixture, and the cost of the antifreeze burned may be more than the fuel
you save.

> wrote in message
ups.com...
> I have a completely stock 1998 Nissan Frontier 4 banger and heard that
> water injection works to increase MPG. Is that true?

As others have already posted, water injection has some advantages, but not
normally fuel
efficiency. It can improve octane response. It can help decarbonize an
engine, possibly.

In the case of tarlike fuel oils, it might even improve efficiency. But not
in your gasoline
engine.

In article . com>,
says...
>I have a completely stock 1998 Nissan Frontier 4 banger and heard that
>water injection works to increase MPG. Is that true?

Half true. Just adding water by itself will not increase your MPG. What
you might be able to do is increase the engine timing a couple of degrees.
That will increase your MPG, but for many cars it will also increase the
chance of pre-ignition( knock ). By injecting water, you cool the intake
and lessen the chance of pre-ignition.
--------------
Alex

"Alex Rodriguez" > wrote in message
...
> In article . com>,
> says...
> >I have a completely stock 1998 Nissan Frontier 4 banger and heard
that
> >water injection works to increase MPG. Is that true?
>
> Half true. Just adding water by itself will not increase your MPG.
What
> you might be able to do is increase the engine timing a couple of
degrees.
> That will increase your MPG, but for many cars it will also increase
the
> chance of pre-ignition( knock ). By injecting water, you cool the
intake
> and lessen the chance of pre-ignition.
> --------------
> Alex
>
>

Not likely on a 98.



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"Alex Rodriguez" > wrote in message
...

> Half true. Just adding water by itself will not increase your MPG. What
> you might be able to do is increase the engine timing a couple of degrees.
> That will increase your MPG, but for many cars it will also increase the
> chance of pre-ignition( knock ). By injecting water, you cool the intake
> and lessen the chance of pre-ignition.
> --------------
> Alex

I have been trying to remember why the popularity of water mist injection
back in the late
60's and early 70's and this post brought it back to me.

You may remember the pollution control devices of those times were
terrible...the engines
ran on after you turned them off, they pinged badly under stress, etc. And
there was little
you could do (legally) to make them run right. Water injection helped some
of those
beasts and it was legal.

(I completely desmogged mine, saved the pieces, and just reinstalled them
before every
inspection.)