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Ricardo Engineering Consultants (the company that designed and produced the Bugatti Veyron’s DSG gearbox and designed the JCB Dieselmax’s engine) has produced a prototype 2.0 litre V6 engine called the 2/4SIGHT, which can seamlessly switch between 2 stroke or 4 stroke mode. It produces the same amount of power as a conventional 3.5 litre V6 engine, while having reduced fuel consumption of up to 27 percent.
The prototype Ricardo 2/4SIGHT engine achieved high torque levels of over 300Nm at 1,000rpm and 460Nm of torque at 2,500rpm.
The prototype also uses other technologies such as electro-hydraulic valve actuation, direct injection, and two stage forced induction combining the use of a Rotrex supercharger and a Honeywell turbocharger. The forced induction system is only in concept form – the actual prototype uses pre-compressed air from an external compressed air supply for simplicity sake.
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me first 2
Another leap by R&D. just like how the new Accord do which is use the minimum cylinder according to the driving pattern.
cool..combining 2-stroke + 4-stroke.
want power, go2-stroke,
want torque, switch 4-stroke.
This has nothign similar to the DOD in the Accord. THe Accord is still a 4 stroke whether its running in 3cyc, 4 cyc, or 6
I wish more car companies will come up with these new engine concepts…AND put them into production.
One good engine that never caught on was the supercharged Miller Cycle engine in the Mazda Millenia. ITs such a nice engine. In concept this is closer, not so much for making power but to reduce pumping losses inherent in 4 stroke designs
Its good we have this vs. the diesotto concept. It will be an interesting next 10 years.
I wonder how it would pass emisions standards as 2 stroke engines typically (and I’m not talking about the smokey kapchais) have large intake/valve overlap (similar to the older rotaries). Which is why they need a positive displacement intake (supercharger or turbo) to force air in during exhaust/intake stroke and direct injection.
Of course you make more power. 2 stroke motors make 2x more combustion burns per given rpm. A prime benefit of 2 strokes will be having less pumping losses. You’d probably noticed 2 strokes have very little engine braking.
Interesting.
This is very good news. If it were in production, think of the smaller engines we will be using, saving fuel. If you need pickup, change to 2-stroke and constant speeds using 4-stroke.
This is similar to variable valve timing system but requires a large variation in timing to switch between the 2-stroke and 4-stroke. I wonder how Ricardo solves that problem.
The 2-stroke is used under partial load and LOW rpm condition. 4-stroke is used when full power or high rpm is used.
The low rpm and high torque suggest the use or high pressure force induction. Then I wonder how they manage to rev the engine? probably it does not rev as high as a NA engine.
Whatever it is, 27% fuel saving is fantastic.
DAMN!!!!!
first we got the fantastic Twin charger engine from VW.
then the VCM from Honda,
now we got this. and look at the figures.
300nm at 1000 rpm. very very driveable. in fact,if left in D alone, i think the car will fly. lol.
i want i want i want.
anything that reduces fuel consumption, engine capacity and gives more power is good.
less is more!