Phase 1 vs. Phase 2 EJ-series 4-cylinder engines
Phase 1 and Phase 2 refer to the Engines, Transmissions and Electronics used in Subarus (aka, Phase I and Phase II). It does NOT refer to body styles or Generations of each model.
See Wikipedia for more EJ-series info. https://en.wikipedia...ubaru_EJ_engine
Note: This pertains to US Domestic Market (USDM) models only. Japanese Domestic Market (JDM) and other overseas markets had more engine choices, but generally the Phase 2 started the same time. The older JDM models were usually a year ahead of those available in the USA, at least for the Legacy model. Subaru established their USA assembly plant in 1989 in Indiana.
Phase 1: All Subaru 1.8 (EJ181), 2.2 (EJ22E, EJ22EZ), 2.2T (EJ22T), and 2.5 (EJ25D) engines from 1989-1998, including the '91-'94 Legacy Turbo and '99 Legacy Outback, SUS and GT*
Note: The 3.3 (EG33) in the SVX is considered a Phase 1, I'd think.
Phase 2: All Subaru 2.0 (EJ205), 2.2(EJ222, EJ223) and 2.5 (EJ251, EJ253, EJ252) engines (incl. turbo versions – EJ255, EJ257) from 1999-2010 (depends on model when the new FB-series engine was 1st used).
*The 1999 Legacy OB and GT’s EJ25D used a Phase 2 shortblock BUT with the Phase 1 ’96-’98 2.5 pistons, DOHC heads, Intake Manifold and engine harness. It also had the Phase 2 4EAT Transmission.
- The Phase 1 EJ22E and EJ22EZ had at least 3 variations from ’89-’98.
- The ’89-’95 (EJ22E) were DUAL-port exhaust vs. SINGLE-port on the ’96-’98. (1996 was still the EJ22E, AFAIK).
- In ’97-’98 (EJ22EZ) Subaru changed to different piston for higher Compression Ratio and SLA on the valve lifters.
Notes about swaps:
- The Intake Manifolds (IM) on PHASE 1 2.2 and 2.5 do NOT interchange/swap with each other or Phase 2.
- The IM on the PHASE 2 SOHC and DOHC ‘might’ interchange w/some slight modification – I’ve read conflicting reports on this. The ’99-’01 2.2 SOHC and ‘99+ 2.5 SOHC will interchange.
- The sensors, IAC, Throttle body, injectors, ECUs, wiring harness plugs, etc are different between Phases, which prevents the easy swaps. The shortblocks (no cylinder heads or IM) can be used across phases in 'most' cases.
-The Phase 2 EJ25x NON-turbo engines include the PZEV variants. I've read - no proof - that these are unique and should not be used as a source for a short block in NON-PZEV cars.
Info on the Phase 1 EJ22E used from ’89-98: http://sl-i.net/FORU...hp/t-16437.html
Changes in the 2.2-litre Phase 2 engines are as follows (most if not all of these updates were applied to the 2.5 engines as well):
• The engine and transmission are fastened with six bolts and two studs.
• The thrust bearing has been moved to the number 5 position.
• The oil groove in the number 1 and 3 have been changed to supply additional lubrication to the crank journal.
• Many changes to the cylinder head and camshafts (specifics on Wikipedia)
• Different pistons with a Compression Ratio of 10:1
• Different Camshaft gears / sprockets
- Additional Phase 2 info:
• Transmissions acquired an external spin-on filter. Designed to last the life of the transmission.
• Different internal electronics
• 2-4 brake band from Phase 1 was replaced with a 2-4 clutch pack
• The valve body went from using five solenoids to seven solenoids
• From here: http://www.searchaut...ges-subaru-4eat
• Note that starting about 2004 in the Forester XT, the Phase 2, Version 2 came out.
Edited by wtdash, 13 February 2018 - 06:45 PM.