Discussion A 250cc V-twin two-stroke that passes Euro4 emissions limits? Sounds good

https://www.motorcycle-magazine.com/vins-duecinquanta-two-stroke/



It’s been decades since the golden era of 250cc two-stroke sports bikes came to an end but the new Vins Duecinquanta in aiming to revive the idea.

Vins first emerged a couple of years ago. Headed by a group of ex-Ferrari F1 designers, the firm showed its first two-stroke concept in 2015. Called the Powerlight it used a 100cc V-twin engine, but a 250 was also promised. Now, two years on, the 250 has been revealed.

The Duecinquanta – it means two-fifty in Italian – appeared at EICMA this year. It looks nearly identical to the previous Powerlight, but packs a much bigger V-twin.


The 90-degree, water-cooled V-twin has a 54mm bore and 54.5mm stroke and uses direct fuel injection. The idea is that by injecting the fuel straight into the combustion chamber after the exhaust port has closed, it’s much cleaner than a traditional stroker. At the moment, the firm hasn’t made any power claims for the road-legal version of its engine, but somewhere around 70hp seems likely.

As usual with V-shaped multi-cylinder strokers, it’s got two counter-rotating crankshafts. They feed into a six speed gearbox and the whole lot slots into a carbon fibre monocoque frame. An unconventional layout includes Hossack-style forks made of carbon fibre, with an adjustable monoshock for the springing and damping. At the back there’s a carbon swingarm acting on a transverse-mounted monoshock via a pushrod.

Unusually, the radiator is above the engine. The large intakes on the bike’s nose feed cool air to it. The hot air then exits under the seat. Smaller intakes hidden behind the front wheel send air to the engine.

Like the rest of the bike, the wheels are carbon fibre, coming from Dymag. It all helps bring the overall weight down to less than 95kg for the road-going version of the Duecinquanta.

Vins is also offering a Duecinquanta Competitzione aimed at track use. It’s got a slightly bigger 288cc engine with a wider 58mm bore and the same 54.5mm stroke. Unhampered by emissions limits, it makes more than 80hp according to its designers. With no road-going kit, the Duecinquanta Competitzione is also 10kg lighter; Vins says it weighs less than 85kg.


Vins Duecinquanta Competizione

It all sounds great, but it won’t be cheap. The road going version will cost around €40,000, while the track model will be even more at about €50,000.

However, if Vins can succeed where others have failed and make an emissions-beating two-stroke, it may inspire other, cheaper machines to follow suit.

 

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