[Diy_efi] WI, methanol, and corrosion

[Dave Dahlgren]

How long does this phase change take? you only have 18.46 milliseconds pe=
r cycle
in this example.. The diesel tractor puller with 100 lbs of boost have a =
charge
air temp or at least around 650 to 700 degrees.. I can see where water in=
jector
would make a huge difference there. Also they are going slow relatively s=
peaking
so a air to air inter cooler would be less efficient as well and a water =
to air
would be very large as well as the water tank. The construction of an int=
er
cooler for 100 psi would be very large and very heavy as well so comparin=
g to a
tractor engine I think is missing the mark. I think that the WI has combu=
stion
benefits but find it hard to believe you can process the water fast enoug=
h in
the intake runner to change the air temp by 140 deg F in 18.46 msec to ge=
t you
to the point a normal IC would be..
Dave

Greg Hermann wrote:
>=20
> At 3:43 PM 1/23/03, William Shurvinton wrote:
> >Have a look at http://not2fast.wryday.com/turbo/glossary/turbo_calc.sh=
tml
> >
> >About 450cc/min to get it back to ambient
>=20
> You're NOT going to get it back to ambient with water. Would be WAY pas=
t
> saturation.
>=20
> (and that's without fuel
> >cooling).200cc will give you about the same as your IC.
>=20
> About 1 lb (about 400 cc) or so to get it into the 120--125=B0F range.
>=20
> This puts you in the range of 1 psi of water vapor pressure--
>=20
> (NOTE: steam tables NOT checked on this)
>=20
> (Assuming you are talking 270 degrees _F_)
>=20
> Compares to you needing 2.3--2.5 lbs/min of fuel for this air flow.
>=20
> Greg
> >
> >Yes that's a lot, but water is cheap and on the street or strip you do=
n't
> >run 20PSI for very long. For the daytona 24 it might not be such a goo=
d
> >idea.
> >
> >Certainly doable and worth considering, depending on your application
> >
> >Bill
> >----- Original Message -----
> >From: "Dave Dahlgren" <ddahlgren at snet.net>
> >To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> >Sent: Thursday, January 23, 2003 9:11 PM
> >Subject: Re: [Diy_efi] WI, methanol, and corrosion
> >
> >
> >> so just how much water to you need to cool 30 lb/min of air at 270 d=
egrees
> >down
> >> to something reasonable?? that is approximately a 2 liter with 20 lb=
s of
> >boost
> >> and no inter cooler at 6500. A head start is a typical inter cooler =
will
> >bring
> >> it down to 130.. Seems like a lot of BTU's to me.
> >> Dave
> >> Adam Wade wrote:
> >
> >
> >
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>=20
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