[Diy_efi] WI, methanol, and corrosion

[Mike]

At 04:11 PM 23/1/2003 -0500, you wrote:
>so just how much water to you need to cool 30 lb/min of air at 270 degrees
down
>to something reasonable?? that is approximately a 2 liter with 20 lbs 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.

Water is approx a million times better capacity than air for holding
ie Absorbing heat (mass for mass), so you dont need a large amount
of water - but it helps if the water temperature starts out quite
low, such as chilled by a peltier device.

Plus, adding Methanol reduces the viscosity vs plain water hence
should get smaller droplet sizes and allows chilling to below
0 deg C etc etc

rgds

mike




>Adam Wade wrote:
>
>> If you cool the intake charge, you can end up with
>> MORE air due to increased density.
>> 
>> You get the benefit of an intercooler, plus the
>> benefit of water injection.  Seems to me that having
>> both would be a bit better than having just WI, but
>> there's a lot of plumbing you don't have, plus the
>> weight...  And of course, no pressure drop through the
>> IC.  So it may end up being better than both together.
>>  And it would appear on the face of it that WI is
>> better than just a plain IC in terms of mass of air
>> charge in the cylinder per cycle.
>> 
>>
>
>
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