Here is a link to the
PowerSport page that describes the modifications they made to their engines and
to the Dyno testing graphs.
http://www.powersportaviation.com/Home/Engines/engines.htm
Apparently they are
pulling 215HP at 6000 RPM. They mention their induction system being
tuned but they do not give details.
Very different engine – peripheral
port induction
They are using an Oil to
water system. Could someone give me a quick description of what an Oil to
Water cooling system is? They claim less cooling drag and more room in
the cowling with this system. Is anyone on this list using one?
Thanks in advance.
It’s just a compact heat exchanger
where the heat from the oil is transferred to the coolant. This
additional heat load is then rejected by a larger coolant radiator. There
can be some advantages, but I don’t think reduced drag is one of them.
Overall cooling radiator area is increased because generally you can run the
oil loop at a little higher temp than the coolant for better heat transfer to
the air.
I looked carefully at this option, but
abandoned it when I could not find an oil-water heat exchanger that would not
have excessive oil side pressure drop with the oil flow rates that we run in a
rotary at high rpm. They all seem to be made for piston engines where the
oil flow rates and heat loads are less.
Jake
www.homebuiltairplanes.com
Al