Turbo-compound diesels coming from Scania
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• Scania could become the first commercial vehicle manufacturer to put a turbocompound diesel engine into production. In Sweden last week the company's vice president of engineering and manufacturing, Stig Ericsson, surprised an international group of journalists by unveiling an R112 4 x2 tractive unit fitted with a prototype turbo-compound version of Scania's 11 litre DSC 11 turbocharged and chargecooled engine.
Scalia says the turbocompound version of its 11 litre engine has a gross power output of 298kW (400hp), compared with the standard engine's 265kW (356hp), while its thermal efficiency is improved from 44% to 46%. This translates into an improvement in minimum full-load specific fuel consumption of about 5%, or about 10g/kW/h.
The prototype engine has a standard block, combustion chambers and cylinder head without any extra combustion chamber insulation to increase the exhaust gas temperature.
Ericsson says that the principal, as yet-unsolved, problems with insulated diesel engines are unsatisfactory quality control of the ceramic materials used in them, and the fact that increasing combustion temperature leads to increased emission of nitrous oxides.
He is confident that the Scania turbo-compound engine will be in production in "about a couple of years".