If your rotary is over heating on take off and you
need to get back on the ground right
now consider using one of these small high pressure
pumps to spray water on the rad.


For the time to climb air plane
I bought two. One for the rad spray
bar and one for water injection into
the intake manifold.

Easier than just using one and a selector valve.

Paul Lamar


   Of course if your overheat blows out all of your water, all the spraying
   won't help. The sprayers will work wonders in a pusher if held on the
   ground for a long time with the engine running and little air going
   through the heat exchanger

   Rich Goldman


   Your supposed to check the temp every few seconds when taking off :-)

   Paul Lamar

   The internal cooling from water injection will be more effective than spray
   to the rad as it drops internal temps without hurting power. Side benefit is
   steam cleaning the combustion chamber.  Water injected engines are
   noticeably cleaner inside.

   Murry Rozansky


Water injection into the intake tract is very good for cooling the combustion
temperature to control detonation. You can still cook the engine though. The
spray on the radiator helps with temperature differential across the radiator
due to latent heat of evaporation. It takes a lot of heat to change phase from
liquid to a gas (steam). This heat is taken out of the hot coolant.
My understanding of the TTC run is the engine is warmed up and then the
timed run is begun.

Giving a cold engine full throttle is an invitation for disaster
even for a stock engine, but an engine as finely tuned as the TTC it would pretty
much be a guarantee for disaster. With that much HP there is going to be a lot
of BTU's put into the cooling system quickly. Only doing this will tell for sure.

There used to be a procedure described by an old Indy mechanic for starting
the turbo Offy engine. Quite the procedure to ensure the engine was not damaged
on start-up. Those engines designed in the '20s lasted as race winning into
the '70s and eventually were capable of almost 4HP per cubic inch and 10,000 RPM.

Try to buy one of them now will cost a LOT of shekels and every one has some
race history.

Dale Davies


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