Turbo Chubby parts

[Bob Wooten]

Greg,

Hope I did not step on your toes, implying that I was talking for you, that
was not my intent.  Just trying to sort all this stuff out.

Onto topic, by negative work do you mean that when the piston comes up
during compression it looses work (meaning that it is not free, it costs me
something to compress the gas) & by injecting water & by it cooling the
charge in the Cyl, it reduces the loss?

But on the flip side that the water reduces the amount of power (positive
work) that I would have got out of that charge if it were "dry"?

But the gain of the reduction of work is larger than the gain in the
positive work, meaning that the NET is more HP?  If I am on track, this
makes more sense (light bulbs coming on like a Christmas tree:)

Ahhhhhhhh, this makes sense.

So, IF I have a motor that is designed for WI I can design it around this
net gain (& the others that you mentioned) & have a solid system that is
going to be more efficient than one w/o it. (assuming a good state of tune
initially)

OR, if I had a motor that was not designed around it I could increase
something (air & fuel for example) & compensate for the increased load on
the engine with WI & keep the efficiency of this system hopefully the same.
(assuming a good state of tune)

OR if I had a system that was not of a good state of tune & I had to back
out timing or air or add fuel to keep the motor from detonating or reduce
the HP output, the WI could compensate for it & bring the motor back the
other direction.  This though sounds dangerous, like trying to fix a severed
arm with a Barney Band aid.

No arguments from me, that's grumpy's job, ;-)
BW




-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Greg Hermann
Sent: Tuesday, December 11, 2001 6:44 AM
To: diy_efi at diy-efi.org
Subject: RE: Turbo Chubby parts


 & increases HP, by
>reducing charge temp (but I have a feeling that this one is open for major
>debate here).
>
>BW
>
Not quite what I have been trying to say.

The cooling during the compression stroke reduces the negative work taken
from the crank to do the compression significantly. The cooler peak temp
ALSO reduces the positive work available during the power stroke, but this
reduction is marginally less than the reduction in negative work mentioned
above. A slight net gain in output is the end result.

BUT--the lower peak temp ALSO results in less heat rejection to the water
jackets, which means some additional gain in power and efficiency will be
there.

The reduction in pressures that goes hand in hand with the lower temps
means lower friction and bearing loads, so more gains in power and
efficiency, as well as better mechanical durability.

The reduction in temps also translates to  better mechanical durability.

If you build the engine knowing you are going to use WI, you can also build
in a higher mechanical compression ratio (for the intended fuel), and reap
more power and efficiency gains there.

Try reading it this way, then argue away ! :-)

Greg


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