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03-27-2020, 04:08 PM | #1 |
Scooby Newbie
Member#: 310796
Join Date: Feb 2012
Location: UT
Vehicle:05 obxt |
ED3 vs ED4 exhaust valves -- what are the diff?
I have an interesting situation where I have ED3 valves installed on one head and ED4 on the other (B25 heads).
The FSM states that oem valves are sodium filled. Simple question: what are the difference between ED3 and ED4 valves?
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04-08-2020, 01:55 PM | #2 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
I'm actually curious but I don't know. I don't often play with OEM valvetrain.
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02-17-2021, 08:33 PM | #3 | |
Scooby Specialist
Member#: 260314
Join Date: Oct 2010
Chapter/Region:
NESIC
Location: S central CT, New England
Vehicle:2007 STI silver gray metallic |
Quote:
I can't see how this is helpful. Heads aren't alike? Are the ED3 or ED4 sodium-filled? |
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02-17-2021, 10:57 PM | #4 |
Scooby Newbie
Member#: 310796
Join Date: Feb 2012
Location: UT
Vehicle:05 obxt |
I am pretty sure the ED3 valves are sodium filled as they cost like 60$ a piece, while the ED4 valves are most likely not (20$ a piece) and a little difference in weight.
IIRC, Subaru switched to ED4 at one point for most turbo EJ engines. As for me, I just kept the ED3s on one head and the ED4s on the other. My engine was like that most likely as a result of a partial head rebuild before I purchased the car. |
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