11/18/2023 0 Comments Subaru jdm engine 2.5i![]() When released in 1994 the Japanese markets offered the EJ25D with newly developed HLA heads which featured a somewhat HEMI style combustion chamber designed to have a higher compression ratio of 10.7:1 in 1996. Some put the previous gen pistons with the later heads to get a higher compression ratio. The EJ25D used smaller rod journals than previous engine designs due to how the new crankshaft was designedįor the 1999 Outback Subaru used a new bell housing design on the engine block using 8 bolts instead of 4, commonly called phase 2, however retains the same pistons as the previous versions resulting in the same compression ratio. The newer version outputs power of 165hp 4400 rpm and torque of 162 lb-ft 4000 rpm. This first version of the engine had a power output of 155hp 4000 rpm and torque of 140 lb-ft at 2800 rpm.īecause the spark plugs are harder to change compared to earlier versions of the EJ series engines, the EJ25 engine came installed with platinum spark plugs to reduce the replacement interval to 80,000 miles. These motors came with DOHC (dual overhead cam) aluminum cylinder heads. The EJ series started in 1994 on Japanese models as the EJ25D. We've researched the various iterations and improvements of the EJ25 motor and collected the important data and components that make them all special in their own way for you to easily browse and learn about these interesting engines. ![]() All EJ engines use a timing belt, have 4 opposing cylinders. All Subaru EJ25 engines have a similar design, with 16 valves, four valves per cylinder, using hydraulic lifters.
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