Opel (Vauxhall) is now rolling out its new generation of its “Whisper Diesel” engine for the Opel Mokka and Insignia, which are claimed to be the most economical, refined and quiet diesels from Opel to date.
For the Opel Mokka, customer are treated to a 1.6-liter CDTI producing 136-horsepower and a staggering 236 pound-feet of torque in the small crossover. These figures outpace the previous 1.7-liter CDTI, climbing six horsepower and about 15 pound-feet respectively. 0-60 happens in a modest 9.9 seconds, and although you won’t be outrunning GTIs, it’s still half a second quicker than the previous 1.7-liter.
In the Opel Insignia, the mid-size sedan is graced with a 2.0-liter turbocharged diesel with 170-horsepower and 295 pound-feet or torque. All of that torque happens within in 1,750 and 2,500 RPM, by the way. The engine boasts 14 percent more torque than previously, but still sips the same amount of diesel fuel as before.
Both of the new engines already meet the stringent Euro 6 emission standards, and C02 emissions are almost on par with a normal gasoline motor. The new 1.6L diesel has already launched in the Opel Zafira, and Meriva MPV models.
Two of the main contributors to the strong and environmentally friendly performance of both engines are the VGT (variable geometry turbine) turbocharger and the high-pressure, common-rail fuel injection system. Injectors capable of supplying fuel at 2,000 bar and of up to 10 injection pulses per cylinder cycle ensure high power, improved fuel atomization and efficient mixing with the air intake charge. The VGT in the Insignia features an electrical actuator for the variable aspect turbine, giving a 20 percent faster boost response than a vacuum actuator.
In layman’s terms, the new engines are much more responsive, and in turn, much more lively.
The new engines also run 5-decibels quieter than the outgoing engines, and engineers have worked hard to ensure a smooth idle and all around driving experience. Meaning, there’s a reason Opel has branded these diesel engines “Whisper.”