Subaru will exhibit the new Boxer Turbo Diesel Engine at this year's Tokyo Motor Show. The Horizontally-Opposed turbo diesel engine is scheduled to enter the European market in 2008.
Subaru's Horizontally-Opposed turbo diesel engine is the first to equip passenger cars and has the benefits of balancing a low point of gravity, low vibrations, compactness and high rigidity.
Because diesel engines produce more noise and vibrations than gasoline ones, they need to have an improved rigidity and also there is a need to add a balancer shaft. This extra equipment increases the weight of the engine thus making it
heavier than a gasoline one of the same capacity. In Horizontally-Opposed engines the pistons on the left and right counteract each other to achieve smooth rotational balance. A stronger engine rigidity has been achieved with a construction of blocks on the left and right to support the crankshaft. Subaru managed to build the diesel engine as compact as a gasoline one of the same capacity.
Performance has been increased by using a common-rail fuel injection system, a turbocharger with
variable nozzle control and a large intercooler. The center of gravity has been lowered by placing the turbo, the oxidation catalyst and the DPF directly under the engine
