Cylinder 4 cooling has long been a known issue on the EJ Family of Subaru engines. The nature of the water passageways around this area means a lack of cooling can lead to an increase in the temperatures around this cylinder.
RCM's simple solution to this problem lies in our easy to fit complete kit. Billet fittings are banded in place on our custom 90 degree Samco silicon hose, which you simply fit into the unused port at the back of the block at cylinder 4's location. This is then tee'd into the water matrix pipe directly above using the supplied HiGrip stainless steel fittings. The billet barb fitting is of the correct diameter to allow the right flow rate around cylinder 4 to cool without over cooling, and the 90 degree pre-formed Samco hose ensures that this flow is maintained without disturbance from potential kinks in the pipework.
Vehicle Fitment:
1994-2000 Subaru WRX GC/GF EJ20
1994-2000 Subaru STI GC/GM EJ20
2001-2007 Subaru WRX GD/GG EJ20/EJ25
2001-2007 Subaru STI GD EJ20/EJ25
2008-2014 Subaru WRX GH/GE/GR/GV EJ25
2008-2014 Subaru STI GR/GV EJ25
2015-2019 Subaru STI VA EJ25
1993-1998 Subaru Liberty RS EJ20
1999-2003 Subaru Liberty GT BE/BH EJ20
2004-2009 Subaru Liberty GT BL/BP EJ20/EJ25
2010-2014 Subaru Liberty GT BM/BR EJ25
1998-2002 Subaru Forester GT SF EJ20
2003-2007 Subaru Forester XT SG EJ25
2008-2013 Subaru Forester XT SH EJ25
Fitment Table
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