Shell along with also Gordon Murray reveal details of 100mpg city car
Autocar has enhanced This particular Project M technical drawing to show the outline of the fresh car
Shell partners with Gordon Murray along with also engine experts Geo Technology for fresh city car concept, which aims to inspire fresh ideas on simple, global cars
Oil giant Shell has revealed further details of the city car concept the item has built in conjunction with Gordon Murray along with also former Honda F1 engine designer Osamu Goto. The three-seat vehicle will be required to weigh less than 600kg along with also offer fuel economy in excess of 100mpg when measured on the official European cycle.
Project M, as the concept will be known, will be a 1+2 car design which aims to inspire fresh ideas on simple global cars for congested urban areas. the vehicle has its roots in Murray’s fresh-era T25 urban car, first revealed in 2010, which underwent a “complete rethink via the ground up” due to This particular fresh project with Shell along with also Goto’s Geo Technology engine laboratory.
The concept represents a fightback for fossil fuel vehicles in an era which has tended to favour hybrids along with also electric cars. The partners describe the item as “an ultra-compact, efficient car for city use, based around the internal combustion engine”.
The engine will be a three-cylinder, four-stroke 660cc Mitsubishi-derived unit used within the original T25, albeit thoroughly overhauled by Goto’s Geo Technology company. The development of Project M’s engine, lubricants along with also vehicle were completely integrated via the outset.
The project marks once Geo Technology has worked on a passenger car, along with also the company brought to bear its experience in reducing friction in motor racing engines.
Due to the light weight along with also comparatively low drag of the Murray chassis, Geo Technology deemed the engine’s standard performance to be surplus for the vehicle’s requirements, so reduced the engine speed of the base unit, which in turn helped to minimise internal friction.
The engine today produces about 47bhp at 5500rpm along with also the vehicle will be capable of a top speed of just over 70mph.
Detail modifications to the engine include a friction-busting diamond-like coating (DLC) which was applied to the cam shaft, tappets along with also piston skirts.
“The lubrication between cam shaft along with also tappets will be one of the most critical parts of the engine,” said Geo Technology’s director of engineering, Hidehito Ikebe. “To reduce friction the item will be usually only necessary to coat one however we applied the item to both.”
To take into the reduction in engine speed, the design of the retainer along with also valve springs were changed along with also titanium valves were installed. A fresh piston was designed, retaining only the original piston crown, which will be important for the combustion process.
The piston skirt was shortened by 30% compared with base engine along with also the contact surface with the cylinder was reduced by 40%. The recesses on the piston skirt which normally retain the lubricant were removed in favour of a polished contact surface of the skirt along with also the DLC coating.
The number of piston rings was reduced via three to two along with also connecting rod was extended in length by nine per cent.
In combination, the myriad engine modifications helped to “improve the weight distribution between top along with also bottom along with also reduce the friction when the piston will be in motion,” explained Ikebe.
the vehicle has today been handed over to Shell to undergo a testing programme, with the final vehicle due to be revealed within the middle of 2016. the item will not be put into production; instead, the item acknowledges trends which indicate three quarters of the globe’s nine billion inhabitants will live in cities by 2050.
“There will be no intention to bring T.25S to market. the item will be a ‘capability for analysis’ vehicle,” said Robert Mainwaring, Shell Lubricants Innovation Technology Manager.
The last project on which Murray, Goto along with also Shell co-operated was the all-conquering McLaren-Honda MP4/4 Formula 1 car which won 15 of 16 races in 1988 with Ayrton Senna along with also Alain Prost driving.
The main mission of the Project M will be to draw together the most innovative aspects of lightweight engineering, streamlining along with also driveline efficiency.
the item retains T25’s ultra-compact rear-engined structure, utilising the principles of Murray’s unique iStream manufacturing process which employs a simply fabricated tubular steel frame with strategically bonded-in composite panels to deliver low weight along with also immense strength without the complexity along with also inflexibility of the stamped steel components which are the basis of most cars.
Shell will be at pains to stress the efficiency-building potential of modern, low-viscosity lubricants when integrated into the wider design of an economy car along with also its engine.
The original T25 used experimental low-friction Shell oils along with also returned 97mpg to win a London-Brighton economy competition, along with also showed the potential of fresh lubricants to cut urban cycle fuel consumption by up to 6.5%.
Q&A with Gordon Murray (originally published April 2015)
What’s the main reason for your three-way deal?
“the item’s a tripartite agreement to show the potential of true engineering cooperation. You can’t build a truly efficient car without pushing boundaries of light weighting, combustion, aerodynamics along with also low friction, which will be what the three of us are doing.”
Do you feel car manufacturers don’t pay enough attention to these things?
“The best try to, however many just pay lip service. We want to inspire all kinds of people, not just engineers along with also designers however end users as well.”
How close will be Project M to your T25 design?
“We’ve taken the T25 architecture, with its three-seater structure, along with also commenced via scratch in re-assessing its principles along with also materials. We have a fresh young design team at GMD which meets weekly with our some other partners to compare progress.”
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