媽义廚要收皮

Volkswagen’s twincharger petrol engine could be on its way out, according to well placed insiders.

The company’s 1.4-litre engine, which mixes turbocharging and supercharging, is said to be too complex and expensive to produce.
呢個結論好似係七八十年代, Lancia已係037上發表左.

Instead, VW engineers now believe that new turbocharging technology can achieve similar results at a much-reduced cost.

The popular twincharger engine, found in numerous VW Group models, won the coveted Engine of the Year award in 2009 and 2010 and was described as “a masterstroke of downsizing technology and a real engineering showcase".

快意會員

Rank: 10

11^#

古惑強發表於 2011-1-19 16:09 | 只看該作者

Me too! In the 1.4L turbo Bravo, I am getting 7.8L/100km fuel consumption during winter time (i.e. no air-con), with 70% country roads up steep hills and long slopes plus 30% in town driving, that is about $1.06/km in today’s fuel price (after discount). Summer time will jump to 8.5L/100km (aka $1.16/km with mild-air conditioning 24c switched on).

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快意會員

Rank: 10

10^#

古惑強發表於 2011-1-19 12:23 | 只看該作者

Indeed a very very costly mistake, however I suppose the engine block / head / crank / direct injection system etc will all stay in place, instead a single tiny (possibly a variable geometry one) will be used instead of the twin charge system, so I guess a significant part of the investment cost would not be completely lost.

If one study the twin charge system specifications, the super charger is effective around 1,500~3,000 rpm, and the turbo comes in around 3,000~4,000 rpm range which is an extremely narrow band in modern day standard. Today a small turbo will easily have optimum efficiency ranging from 1,800~4,500 rpm, (a variable geometry one can push the effective range even higher in the upper rpm range), provide that the boost strategy is geared towards fuel efficiency and torque rather than pure HP.

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