Automotive Engineering - October 2021 - 25

ADVANCED PROPULSION FEATURE
A 650-cc variant is planned for urban buses, local
distribution vehicles, garbage trucks and off-highway
applications. Dry weight is approximately 24 kg (53 lb)
and it would produce 34 kW (46 hp) at 4,000rpm.
A 2.0-L engine with an output of about 93 kW (125
hp) also is proposed for trucks with one, two, or three
engines based on vehicle size. Even higher swept volumes
may be practical, Garside suggested, and that
additional power could be extracted from this engine
by using a turbocompound system, harnessing exhaust
gases to drive a turbine which in turn would
drive a high-speed generator.
" The exhaust port opens much faster than a [conventional
IC engine's] valve lifts and all the exhaust
gases would be exiting from a single port, not multiple
ports, " explains Garside. " Hence the turbine could be
fitted very close to the exhausting chamber and collect
some of the blowdown energy, as well as the expansion
energy. "
Roller bearings are used for both the rotor and
main shaft and lubrication is by total loss. The quantities
of oil involved are extremely small because the
total areas requiring lubrication are far smaller than in
a reciprocating engine and experience no violent acEnd
plates (at left) and main shaft of a development engine
showing rolling-element bearings. Apex seals are made from Si3N4 material.
celerations or direction changes. Rotor apex seals are made from
extremely hard, low-friction Si3N4 material. The engine requires neither
filter nor oil changes, reducing engine servicing to infrequent
sparkplug changes.
AUTOMOTIVE ENGINEERING
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October 2021 25
DAVID GARSIDE
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Automotive Engineering - October 2021

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Automotive Engineering - October 2021 - SPONSOR1
Automotive Engineering - October 2021 - CVR1
Automotive Engineering - October 2021 - CVR2
Automotive Engineering - October 2021 - 1
Automotive Engineering - October 2021 - 2
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Automotive Engineering - October 2021 - 4
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Automotive Engineering - October 2021 - CVR3
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