Creating a new concept
engine takes time. The development of the 'Pivotal' design started
with the construction of a single chamber 264cc engine. This engine
responded well running up to 7,000rpm. This was followed by a
400cc twin chamber motorcycle engine. This engine ran up to 11,500rpm
and drove the motorcycle to speeds exceeding 160kph.
Development was then focused on the 500cc single chamber module
which formed the basis for the one
litre twin chamber demonstration engine.
is pursuing further development with 'direct to chamber' fuel
delivery, combustion control, performance improvements, component
design and materials investigations. The 'Pivotal' engine is suited
to operating on alternative fuels and we are confident that the
'Pivotal' design will make a compact, high power diesel engine.
The absence of mechanical noise makes it particularly suited for
use in power co-generation and other auxiliary engine and military
applications. We have developed a dedicated 'Pivotal' engine simulation
tool and this allows us to more accurately predict the performance
of a prototype engine.
Direct Injected 1100cc Twin Chamber Pivotal Engine
We have developed
this 1100cc Pivotal engine to evaluate the suitability of direct
injection in applications such as light aircraft, Personal water
craft and outboard boat engines. This engine is currently undergoing
durability testing and detail improvements before further optimization
of the Orbital DI system. Fuel consumption and emissions output
will be posted on this site as soon as it is available. For this
exercise we used the crankshaft and crankcase of the twin cylinder
951cc Rotax engine. It is well engineered and equipped with an
integrated air compressor unit which is required to operate the
Orbital Direct Fuel Delivery System which we chose for this engine.
of this engine is still far from it's potential and we expect
power output to exceed 90kW @ 6,500 rpm. This provides a good
starting point for the development of a compact automotive power
unit. Perhaps a 4.4 litre V8 delivering a useful 360kW.
Oshkosh Airventure Expo in Wisconsin
The 1100cc Direct
Injected twin chamber Pivotal engine will be on display at the
Oshkosh Airventure Exposition 23-29th July 02. The booth No. is
2078 in hanger B. The purpose of this display is to test the end
user interest in the advantages of the Pivotal engine for light
aircraft applications. The engine will be set up into light aircraft
mode fitted with a 'Sub4' reduction box and an Airmaster variable
from the Hydrogen Conference Washington DC - 30th March 2005
ON THE POTENTIAL OF THE WATER-COOLED PIVOTAL PISTON H2ICE TO EXTEND
POWER DENSITY AND TOTAL VEHICLE EFFICIENCY."
(Author Paul A. McLachlan)
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file in html format (document will open in new browser window)
OR Click here
to download & view this file in Word format (Word doc.
Engineering International Innovation Award - 20th May 2005
here to view our recent AEI Award and information. (Will
open in a new browser window.)
Presentation to the Californian Hydrogen Business Council - 27th
- 'What is an ICE' - click
to download this Powerpoint presentation.
- "The Pivotal Hydrogen Engine, The Catalyst to The Hydrogen
Economy" - click
to download this PDF file. (78kb)
Pivotal Hydrogen/CNG engine Development - 12th February 2009
to download this new Powerpoint presentation (6mb)