Has anyone used a remote mounted belt driven water pump?  I remember
something about a Toyota pump a few years back.

There has been a number of remote water pumps, but Don Dunbar trailed a
Toyota one I think. From memory it was marginal.
I guess your considering remote, to get away from the height of the stand
pump - from memory I don't think there has been something of outstanding
success.
George (down under)

RE> Hi Joe,
RE> I was part of the trial of the Toyota pump done by Don Dunbar, The Al
RE> alloy Toyota pump, from a 6 cyl Supra as I recall,
RE>   out-performed the Series V RX7 pump, turned slower and needed less
RE> head and had higher flow. It was an excellent installation, where the
RE> water fed directly into the center axis of the impeller.   The reason
RE> he did not progress with it, was because Don bought 2  RX 8 engines
RE> through George (downunder),  It was still in his workshop when I was
RE> last there a couple of months ago, and he will be back from China next
RE> week, I believe. So I will ask him to respond to your questions, if you
RE> wish.
RE> Paul, I think you should have some photos of Don D's earlier
RE> installation on file.
RE> BR, Dave McC


RE> Yes I have a few.


Hi Joe,
It has been some time since I have responded to the news letter. I
have been away in China for 4 weeks again.
Joe my test where done with many Mazda and Toyota pumps.
lets call the cast iron impeller CI. The twin turbo version has a
pressed steel impeller. They  where all tested on the same rig and the same motor
drive source. All pumps where tested with am open vent to the
atmosphere which was measuring the head each pump produced through the
13B engine at the same pump RPM. I also tested the Davies Craig
electric pump on the same rig. All test where carried out on the 13B
engine without a thermostat. My reasoning for this is in a car as the
engine was designed for is required to handle mass heat at low air
flow through the cooling system and low rpm of the pump. Hence we have
a thermostat. If you look at the thermostat it has a small hole
through the center 3/4"? If the cooling system is running as designed
and returning water to the thermostat is at the design temp then in a
car we don't have a problem. The hole through the thermostat is a
function of maximum flow required at max hp output of the engine with
a return water temp to the thermostat. Pump flows in motor vehicles
need to handle a wide range of parameters that we don't experience in
aircraft. When is the first time your car gets hot? In traffic at a
crawl with no pump flow and no air through the radiator and high temps
due to traffic. If we look at some of the aircraft installations there
have many that have used air conditioner coils. These only have 1/2"
line to them and where running thermostats. In conclusion I did run
test through the 13B without and with a thermostat simulation of hole
size. As the water pump in a motor vehicle runs through a wide range
its volumetric efficiency at rpm range. Only at the low rpm is it at
its best. When it is not pumping head through the thermostat. I have
done tests with a simulated thermostat hole size and at the rpm that we
will cruise at the standard Mazda pump is an overkill. From my
research the radiator manufactures say water speed is at its best
at 38' per minute. Last of all we must consider that when the
thermostat is wide open much of the flow will still return through the
radiator to keep the cooling system working and a reserve cooling
factor if the radiator is clean and has enough air as per design. My
pump test though the engine with the thermostat wide open show at high
rpm they are at very low volumetric efficiency and are in cavitation.
Joe back to the question! The Toyota pump performance was very close
to the CI Mazda pump with thermostat but was better on the test
without thermostat. I have now found that the twin turbo engine has a
larger hole through the thermostat. This would be increasing the
volumetric efficiency at higher rpm.
My conclusion is we can have a lower volume pump if the thermostat is
not used. Any restriction in orifice in the system will build pressure
in the system. Engine cooling pumps are not pressure pumps but
circulation pumps and should will not pump a lot of pressure head.
All the above must be taken in the text of the 13B factory output.
Joe I have helped