Answers to Rod's EJ22T vs EJ22 N/A ?'s
Posted: Fri Sep 21, 2001 11:47 am
Hi Rod, The 2.2 Turbo Legacy is a whole different car than the 2.2 normally aspirated Legacy. There are differences in the suspension system, the braking system, the fuel system, the cooling and lubrication systems, the emission control system, the exhaust system, the manual and automatic transmissions, the auto trans control unit (TCU), the engine control unit (ECU) and even the seat shape and adjustment allowances. Did I forget anything? Oh yeah, the engine.
I assume from your question you are really interested in engine differences.
The following is from a Subaru tech friends 1991 Model Year Update Course Reference Booklet
The turbo block enjoys a closed deck vs an open deck for the N/A block. Oil jets have been added to the lower portion of the cylinder block to cool and lube the pistons. the cylinder heads have been modified and the coolant passages in the heads have been changed to match the new block design. The heads are NOT interchangeable side to side nor with the N/A engine...there are 3 holes in the right head for the turbo oil supply, oil return, and coolant return. The intake valves have been reduced to 27 mm for the turbo and the valve seat material for both the intake and exhaust valves has been changed to a harder material.
The new heads require new head gaskets with water ports repositioned to match the passages in the cylinder block (this is why I always wonder how the 2.5 swap is a no brainer bolt on !?!?) The grommet area has been increased for improved sealing. The N/A gasket has two identifying notches, the turbo gasket has three.
Lead has been removed from the crankshaft in order to make it more rigid, and the engine bearing material has been changed. The main bearing grooves have been modified so more oil is retained at the shaft. The are NOT interchangeable with N/A bearings.
The tip of the pistons are dished to modify the compression ratio. The thickness at the top of the piston has also been increased for added strength. In addition, the top of the piston is coated with graphite to increase wear resistance. The first and second piston ring lands are thicker for additional strength due to the increased combustion pressures. The top ring's width and depth have been increased in order to provide efficient cooling for the top of the piston. The top ring material has been changed to QB hard chrome for increased resistance to wear, and has been coated with molybdenum to prevent metal deposition with the piston. The piston pin length has been increased to provide additional strength.
A right side camshaft support has been added to the turbo engine in order to supply oil to the turbo and return coolant from the turbo. Oil and water separation is provided by an "O" ring. The camshaft has a new profile designed to match the characteristics of the turbo engine.
The oil pump assembly uses a wider rotor in order to provide increased pressure and volume
Fuel injectors, have been modified in order to provide additional fuel flow, and recognizable by their pink connector color.
------------------------ ---------------------~-->
Monitoring Service trial
http://us.click.yahoo.com/MDsVHB/bQ8CAA ... /XoTolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
I assume from your question you are really interested in engine differences.
The following is from a Subaru tech friends 1991 Model Year Update Course Reference Booklet
The turbo block enjoys a closed deck vs an open deck for the N/A block. Oil jets have been added to the lower portion of the cylinder block to cool and lube the pistons. the cylinder heads have been modified and the coolant passages in the heads have been changed to match the new block design. The heads are NOT interchangeable side to side nor with the N/A engine...there are 3 holes in the right head for the turbo oil supply, oil return, and coolant return. The intake valves have been reduced to 27 mm for the turbo and the valve seat material for both the intake and exhaust valves has been changed to a harder material.
The new heads require new head gaskets with water ports repositioned to match the passages in the cylinder block (this is why I always wonder how the 2.5 swap is a no brainer bolt on !?!?) The grommet area has been increased for improved sealing. The N/A gasket has two identifying notches, the turbo gasket has three.
Lead has been removed from the crankshaft in order to make it more rigid, and the engine bearing material has been changed. The main bearing grooves have been modified so more oil is retained at the shaft. The are NOT interchangeable with N/A bearings.
The tip of the pistons are dished to modify the compression ratio. The thickness at the top of the piston has also been increased for added strength. In addition, the top of the piston is coated with graphite to increase wear resistance. The first and second piston ring lands are thicker for additional strength due to the increased combustion pressures. The top ring's width and depth have been increased in order to provide efficient cooling for the top of the piston. The top ring material has been changed to QB hard chrome for increased resistance to wear, and has been coated with molybdenum to prevent metal deposition with the piston. The piston pin length has been increased to provide additional strength.
A right side camshaft support has been added to the turbo engine in order to supply oil to the turbo and return coolant from the turbo. Oil and water separation is provided by an "O" ring. The camshaft has a new profile designed to match the characteristics of the turbo engine.
The oil pump assembly uses a wider rotor in order to provide increased pressure and volume
Fuel injectors, have been modified in order to provide additional fuel flow, and recognizable by their pink connector color.
------------------------ ---------------------~-->
Monitoring Service trial
http://us.click.yahoo.com/MDsVHB/bQ8CAA ... /XoTolB/TM
---------------------------------------------------------------------~->
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
