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04-17-2008, 10:39 PM | #1 |
Scooby Guru
Member#: 106510
Join Date: Feb 2006
Chapter/Region:
VIC
Location: Osoyoos, BC
Vehicle:98 Widebody 3.4L Smooth Safety Blue |
EJ25D -> V4 STI head conversion
While technically not bolt-on, I felt that this was relevant to this topic.
I lost oil pressure and wrecked the oil journals in my V4 STI heads, and since the castings are the same, I decided to use EJ25D heads to replace them. The only real modification I made was to the passenger side head, which needed oil and coolant lines to be drilled and tapped for the turbo. People seem to like messing around getting oil and coolant from other parts of the engine, but I dont see why since the bosses are right there, and the factory banjo lines work perfectly. Here is the back of the head as it comes from the factory. Drilled out the oil return at the bottom of the head to 15mm, and the coolant boss to 7/16", then tapped it with a 12x1.25 bottoming tap. The oil boss is already drilled and tapped from the factory, it just has a plug in it. With the banjos installed
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04-18-2008, 03:38 PM | #2 |
Scooby Specialist
Member#: 132130
Join Date: Nov 2006
Chapter/Region:
TXIC
Location: Austin, Texas
Vehicle:2002 Ford F-150 Graphite Gray |
nice, i plan on doing the same if i ever get a set of these heads
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04-21-2008, 01:03 PM | #3 |
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region:
NWIC
Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
is the chamber volume the same?
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04-21-2008, 03:13 PM | #4 |
Scooby Guru
Member#: 106510
Join Date: Feb 2006
Chapter/Region:
VIC
Location: Osoyoos, BC
Vehicle:98 Widebody 3.4L Smooth Safety Blue |
I didnt measure the chamber volume, but the castings were identical as far as I could tell with the naked eye.
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06-21-2009, 09:35 PM | #5 |
Scooby Guru
Member#: 36333
Join Date: May 2003
Chapter/Region:
NESIC
Location: East Kingston NH
Vehicle:98 RS GT30R, closed deck madnes |
Can you elaborate which is your feed and return ? I need oil feed & return for my GT30R when I install it in the near future. Would this be the best place to go for the oil ? What parts would I need to do this ? IE, what banjo bolts and whatnot ?
would it not be better/easier to go this route for feed? Last edited by IllNastyImpreza; 06-21-2009 at 09:40 PM. |
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