You may have seen in new 2015 Volkswagen model specs for the TDI trims, the phrase “EA288 Clean Diesel TDI Engine.” Yes, it is a lot of technical information on the new diesel engine, but not only does it offer drivers improved horse-power the EA288 engine provides greater fuel efficiency as well. What exactly is the EA288 engine and how will it affect your VW TDI model’s performance?
From the desk of VW:
The all new Volkswagen Diesel EA288 engine family is designated the modular diesel matrix, or MDB, and will form the basis for the majority of future U.S.-market Volkswagen diesel products.
The compact EA288 engine has the intercooler for its turbocharger system integrated directly into the intake manifold, which serves a two-fold purpose of increasing throttle response and performance as well as helping lower emissions. The engine block is cast iron, with a forged steel crankshaft that runs in five main bearings and has four counterweights. In order to counteract engine vibration and maintain smooth operation, the EA288’s crankshaft is connected to two gear-driven counter-rotating balancer shafts that spin at twice engine speed. Friction has been reduced by about 15 percent in the engine, thanks to the use of roller bearings for the drivetrain side camshaft, increased piston-to-wall clearance, and lower piston-ring tension, among other measures.
The aluminum-alloy crossflow cylinder head has a number of unique features. First, the camshafts are integrated into a separate housing by a thermal joining process, ensuring a very rigid camshaft bearing while keeping the weight low. Second, each overhead camshaft operates one intake valve and one exhaust valve per cylinder (as opposed to one camshaft for intake valves only and one for exhaust), allowing for greater air delivery and swirl. The engine features variable cam phasing on the intake and exhaust valves.
Like its gasoline-powered brethren, the EA288 Clean Diesel TDI engine places strong emphasis on thermal management, which is evident in the cylinder head’s two-section coolant jacket, as well as a three-part cooling circuit and switchable coolant pump. Compared to the previous engine, emissions are reduced by up to 40 percent, helped by siting the exhaust after-treatment module close to the engine and by the use of a low-pressure exhaust gas recirculation system.
Optional on the TDI Clean Diesel is Volkswagen’s DSG® six-speed automatic. This dual-clutch transmission is considered one the most-efficient automatics in the world. It incorporates a dual-clutch system that instantly engages and disengages gears without the need for a clutch pedal. With a special computer controlling the process, one clutch is engaged on the next gear, while the clutch from the previous gear is released.
The results are crisp, quick shifts, without the loss of power that is experienced with a traditional manual gearbox. It’s the perfect choice for drivers who want the performance of a traditional manual transmission with the precision of an automatic.
With the new EA288 clean diesel engine, the 2015 VW Golf TDI was named NorthWest Green Vehicle of the year.