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SUB-4 Aircraft Engine- Over the
years aircraft owners have been looking for a reliable, affordable, four
stroke engine for to use in their ultralights and light planes. One
engine that has been used for a number of years is the Ea81 Subaru
engine.
A company from New Zealand was at Sun N Fun 2000
with their SUB 4. The SUB 4 has been in the R&D stages for the last
two years. While the basic block from the Ea81 is used the rest of the
engine has undergone extensive changes and or modifications.
These start with the SUB 4 Port heads. These
have been modified to give "one port per valve for both inlet and
exhaust to allow for tuned length of induction and exhaust. They have
two spark plugs per cylinder for true dual ignition. The heads are cast
in ASTM 356 aluminium alloy, which is heat treated and CNC machined.
The heads come with bronze valve guides, 42 mm inlet valves x 7 mm valve
stems. Performance valve springs, match cam and h.p. option. The water
outlet fitting accepts a standard automotive water hose. Each head set
is supplied with a camshaft ground to match the h.p. option.
The rocker covers on the SUB 4 are also unique.
They are cast ASTM 356 alloy, with a finned design to aid cooling. A
"O" ring is used for sealing. One cover is set up as the oil
filter while the other as the breather.
Reduction Drive: The SUB 4 reduction drive has
three cases cast in ASTM 356 heat treated aluminium. The intermediate
case can be rotated 180 degress to allow for props in an up or down
installation. The reduction gears are manufactured from EN39B case
hardened to 60 Rockwell C. They are 11 degree helical, and 40 mm meshing
width incorporating a radiused oil relief groove.
An aluminum flywheels incorporating a high
tensile steel ring gear is used, with a rubber cush drive on the
flywheel. Ratios of either 1.8 to 1 or 2.2 to 1 are available.
All of the above components are available
complete or as separate units for the do it yourselfer!
For more information contact:
Rotor Flight Dynamics Inc.
19242 Grange Hall Loop
Lithia Fl 33547 USA
813-634-3370
Sub4 Performance Aeromotive Parts
25 Euclid Avenue
PO Box 10004
Te Rapa, Hamilton
New Zealand
Phone: 64 7 849 3814
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