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Turbocharged, Supercharged, and Hotrod Motorcycles: [turbobike] water injection

[turbobike] water injection

Dave Morrill (david.p.morrill@fairchildsemi.com)
Tue, 19 May 1998 15:24:04 -0400

Guys,
	Here's an article from the turbo car guys, very applicable.  I don't
know who wrote it, so I can't give them credit.  It's a hack but fun
reading.

Also, I suggest using winshield washer fluid, it doesn't freeze and
contains alky-haul, which is a bonus!  I'd also suggest using a water
level alarm/boost cutoff to alert you on low fluid, detonation can ruin
your weekend.

-Dave

Sorry for all the HTML baggage....

<CENTER><FONT SIZE="6"><B>Intercooler Sprayer Ideas</B></FONT></CENTER> 
<P>

</P>
<P><FONT SIZE="4"><B>The first selection is from Eric Typpo as written
in the
MDSOG Newsletter a few years back.  He really knows a hell-of a lot
about the
DSMs, so give him an <A HREF="mailto:etyppo@menudo.uh.edu">
email</A>.</B> 
</FONT></P>
<P>

</P>
<P>From testing I've done with a pyrometer, one weak point on the 
Diamond
Stars with increased boost levels is the intercooler. Under sustained
boost, it
heats up quickly, heat soaks and cools down slowly. Alamo Autosports
only claims
a not very spectacular 63% efficiency @ 16 psi. for their intercooler
<B>UPGRADE</B>,
also implying that the factory intercooler is pretty inefficient at
cooling the
intake charge. Spearco makes a device which sprays fluid on the
intercooler to
increase intercooler efficiency, but at $125, I have always been too
cheap to
get one and did not have space for the tank to hold the fluid.
Therefore, I
decided to make one myself using the rear washer mechanism and about $10
worth
of parts. To make the conversion yourself you will need: 
</P>
<P>

</P>
<P><B>1. About 25' of 5/32&quot; vacuum hose.
</B></P>
<P>2. A washer nozzle to spray the fluid across the intercooler. I found
one at
Pep Boys (Motormite P/N 47110) which is designed as a replacement for GM
midsize
cars. It is perfect because the nozzle is at a 90 degree angle to the
fluid
input which makes mounting on the intercooler shroud very easy.
</P>
<P>3. A Whisper one way aquarium air line valve. 
</P>
<P>4. A vacuum line tee. 
</P>
/P>
<P><B>1. About 25' of 5/32&quot; vacuum hose.
</B></P>
<P>2. A washer nozzle to spray the fluid across the intercooler. I found
one at
Pep Boys (Motormite P/N 47110) which is designed as a replacement for GM
midsize
cars. It is perfect because the nozzle is at a 90 degree angle to the
fluid
input which makes mounting on the intercooler shroud very easy.
</P>
<P>3. A Whisper one way aquarium air line valve. 
</P>
<P>4. A vacuum line tee. 
</P>
<P>

</P>
<P>The washer mechanism is at the very back of the car, behind a panel
in front
of the driver's side tail lights. Remove the panel(s) and disconnect the
original hose and attach the new vacuum hose. (squirt all the old fluid
out
first since it will drain when you remove the old hose). Route the hose
out the
car through one of the grommets around the hoses that drain the
perimeter of the
hatch on either side (I did it on the driver's side). Run the hose
beneath the
car, securing the hose to the fuel/brake lines withwire ties along the
way.
Remove the shroud in front of the intercooler and drill a hole as far
away from
the intercooler as possible (to increase the dispersion of the fluid),
insert
the nozzle and connect the hose to it.  
</P>
<P>The problem at this point is that the hose will continue to siphon
the
washer tank after it is used, so your first application will also be
your last.
To prevent that, I created a siphon break by putting a tee and a short
length of
hose with a Whisper one way aquarium air line valve at the end, on the
hose at a
point above the washer tank at the back of the car. It is important to
create a
fairly sharp bend in the hose and put the tee at the top of the bend for
maximum
effectiveness. The one way valve prevents fluid from squirting out under
pressure, but air is pulled in to the hose, breaking the siphon after
the washer
is turned off. (The end of the valve that you CAN'T blow through is
pointed
toward the tee) Use the sprayer for a second after filling to make sure
that any
siphon that was created during filling is broken.  
</P>
<P>Overall, it is a cheap way to regain a few of those horsepower lost
to
summer heat by increasing the efficiency of factory as well as upgraded
intercoolers. <B>Spearco sells a pressure switch for $36<B> which could
be
used to make the sprayer activate automatically under boost, but I have
not
experimented with it yet.