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Paul,
You're describing my arrangement to a "T". So, I'll let
you know how I plumbed my system. First, it requires a bung to be
welded to the top of the outlet tank on you radiator, where the air
pocket would form. I used a -4. You will want to run a line
from here to the small side fitting on the purge tank. I connected
the bottom fitting of the purge tank to what you show to be connection
2. By using a "Y" you can make it do double duty with the
heater core. As an alternative, you can add another line on the
suction side of the water pump. The idea here is to have the
coolant circulate from the top exit side of the radiator through the
purge tank and then back into the engine. You can use the
barb under the oil filter as a source of hot water for the heater
core.
One more thing concerning filling the system. I removed the
thermostats, so I did not use the thermostat housing, but used a
block-off plate instead. I drilled and tapped a hole for an
air-bleed on this plate. (Moroso makes a nice little air-bleed...
see pic attached.) It is at the highest spot on the engine.
You might be able to use Connection 2 for this purpose, but it looks to
me like you could have some air still trapped in there if you did
that. So when you are filling your engine through the purge tank
cap, open the air-bleed on the top of the water pump housing and leave it
open until coolant begins to run out, then close the air-bleed.
This will allow any air to be removed from the engine. I would
check this a few times after the first few short runs, but when the
engine has cooled so as not to scald yourself.
Also, you can feel the side tanks of the radiator and the purge tank to
tell if there is hot water or air in the tanks.
Mark S.
I have about 3 hours running on my engine and the system seems to be
working as intended. I copied the system used on my LS1
Chevrolet. At 10:17 PM 1/6/2004 -0500, you wrote:
Well, my
custom C&R radiator arrived today. Looks like nice workmanship.
Getting ready to connect all of my cooling connections. I ordered the -16
hose and fittings today....I ended up using Summitt, as I had a credit
there, and they had everything in stock, and I want to make some NOISE
!!! Unfortunately, I ordered before finding out about
Pegasus....That's OK....at least it's on it's way.
I purchased an
aluminum expansion tank from Canton Racing Products, part number
80-200 see
www.cantonracingproducts.com/tanks/expansion_tanks.html
It has a 1/2"NPT fitting on the bottom, and a 3/8"NPT on the
side, and provisions for a radiator cap on top.
OK....I know the two
-16 AN fittings on the radiator will go to the top and bottom large
inlet/outlets on the waterpump. That's when the water gets
muddy....where might I make the connections for the expansion tank so
that I can put water into this thing? I need to furnish a little
more information. I am also planning on installing a heater
core/fan combination in the cockpit for heat. I found that there is
a 5/8" barbed heater core nipple underneath the oil filter. I
had originally figured on using that to go to the heater core. There is
another area for a fitting on the water pump. It is an angled fitting
right next to the very bottom of the water pump where the large -16 hose
will connect. See area labeled "connection 2" on the picture of
the water pump. I had planned on using that for the other connection to
the heater core. Finally, there is also another plug on the water pump
labeled "connection 1" in the same picture. I have no idea what
that is/was for. Any suggestions on how to incorporate a heater
core and this expansion tank into my system? I planned on
installing the expansion tank at the very top of the firewall, above the
engine. Any and all suggestions are welcome and very much
appreciated. Sorry for all the questions....I would much rather
learn from "those that have gone before" than to make my own
expensive and time-consuming mistakes. Maybe I'll do it right the
first time? Thanks again for all of your assistance.
Paul Conner
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