Subaru has launched its third-gen boxer design, which is fitted in the 2011 EUDM Forester. The new boxer engine is badged as FB20, replacing the EJ20 one, and according to Subaru, it's around 10% more fuel efficient. The specific version of the engine doesn't come with direct injection, but Subaru has improved a lot of other areas.
The combustion chambers have been redesigned and they are now more compact, there are chain-driven cams and intriguingly "bent" connecting rods (they allow installation and maintenance work without separating the block). The piston stroke has been increased and the valvetrain has been modified. The block and head have been also redesigned and the oversquare layout of the EJ engine (92 x 75 mm) has changed now to an undersquare layout of 84 x 90 mm. Those changes have resulted to improved low and mid-range power delivery and the FB20 engine fitted in the new Forester delivers 148 hp.
I really look forward what else Toyota and Subaru will change in the FB20 version which will be fitted in the FT-86.
The combustion chambers have been redesigned and they are now more compact, there are chain-driven cams and intriguingly "bent" connecting rods (they allow installation and maintenance work without separating the block). The piston stroke has been increased and the valvetrain has been modified. The block and head have been also redesigned and the oversquare layout of the EJ engine (92 x 75 mm) has changed now to an undersquare layout of 84 x 90 mm. Those changes have resulted to improved low and mid-range power delivery and the FB20 engine fitted in the new Forester delivers 148 hp.
I really look forward what else Toyota and Subaru will change in the FB20 version which will be fitted in the FT-86.
More photos after the jump!
