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Old 06-05-2005, 03:21 AM   #21
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Member#: 64494
Join Date: Jun 2004
Location: Australia
2001 V7 sti


I was led to believe the change from closed deck to open deck Ej20 was a side effect of WRC regulations. Prior to the rule of engines having orifice plates the EJ20 blocks were cast to be able to handle high hp. However an engine fitted with the orifice plate had a hp limit of about 350hp.
Basically subaru was wasting money casting fully closed deck blocks and changed to open deck designs in order to save manufacturing costs the open deck design was easily able to handle the new 350hp limits.
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