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11-12-2022, 11:27 AM | #1 |
Scooby Specialist
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Join Date: Jan 2014
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Vehicle:2005 Cobb Stg2+ Wrx Platinum Silver |
Head rebuild questions.
I will soon be sending off my 2005 Wrx ej205 non avcs heads to be cleaned, milled, refreshed and had some questions I would like some opinions in.
I'm kind of going for a stockish, oem+ish rebuild. I don't really plan on any heavy porting or aftermarket cams. Definitely replacing valve stem seals and likely bronze valve guides and new oem buckets to set lash. If doing just a light port and polish, and using oem ej205 cams, is there any benefit to aftermarket valve springs? Or just buy new oem valve springs? Oem sti valve springs? I don't plan on reusing my old springs, which is why I'm interested in aftermarket or new oem. If using oem springs, is there any benefit to aftermarket retainers and/or keepers? Lighter/stronger sounds good to me. What about aftermarket spring seats? I don't plan on reusing the old stuff, so interested in aftermarket or new oem. Would there be any benefits to stock diameter aftermarket stainless valves? Stronger, better flowing sounds good to me, or should I just stick with new oem valves? I don't plan on doing anything crazy, but don't plan on reusing most of my old stuff. So its either new oem pieces or a slight upgrade. Any advice or recommendations would be greatly appreciated.
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11-12-2022, 12:20 PM | #2 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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I always use bc1600 springs in my stock cam heads. They are a good price and give you some head room
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11-13-2022, 07:02 PM | #3 |
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if using oem cams there is no benefit as there will be o binding, you can even use a 262 grind with a mild lift... stage one cam and you should be okay, unless you want to bump up the red line. I hve used stock on a 400hp 2.1 with v9 heads and avcs running red line to 8000
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11-14-2022, 12:17 PM | #4 | |
Scooby Specialist
Member#: 378421
Join Date: Jan 2014
Location: NC
Vehicle:2005 Cobb Stg2+ Wrx Platinum Silver |
Quote:
Any benefit to titanium retainers? Stock size stainless valves? Or just stick to stock pieces and new valve stem seals? |
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11-14-2022, 12:34 PM | #5 |
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Join Date: Oct 2022
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i'd say all stock except get a good set of springs and matching titanium retainers. if was me i'd call IAG and ask them for springs/retainers they would recommend.
maybe this: https://www.iagperformance.com/iag-s...aru-ej-engine/ $249 if they have any black friday discount maybe they let you get the discount today! i dont think i would re-use the stock springs you already have, probably are tired out a little bit depending on the miles on them. not worth the risk |
11-14-2022, 12:35 PM | #6 |
Scooby Newbie
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double posted bug
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11-15-2022, 02:01 PM | #7 | |
Scooby Specialist
Member#: 378421
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Vehicle:2005 Cobb Stg2+ Wrx Platinum Silver |
Quote:
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11-24-2022, 11:38 PM | #8 |
Scooby Guru
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Chapter/Region:
AKIC
Location: Oneonta, NY
Vehicle:2005 WRX STi WRB |
Not really. To stiff and you'll get spring bounce. Also the stiff spring will slam the valve into the seat. If You have the seats cut then you'll want to adjust and get a stiffer spring to retain seat pressure and avoid valve float.
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11-28-2022, 02:26 PM | #9 |
Scooby Specialist
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Always new springs. Do you run it hard? Rev the **** out of it compared to your expected normal driver? I do, so I always use some sort of better spring. If it were a vortech or LS I’d use at least blue z06/Chevy perf springs and no word on all those C5 z06 beating the seats out.
Let’s not forget about boost, any added boost is pushing against that closed valve. |
11-28-2022, 02:55 PM | #10 |
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11-28-2022, 03:21 PM | #11 |
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Figured id mention this tomei sells shims also. So you can shim the factory or sti valve springs. I got the shims on my car and had good luck with them. Sometimes the springs and whatnot arent equal seat pressures. They can vary depending on seat depth and valve seat. If its slightly worn or machined. A small shim here and there can equal it out. Like setting a bearing clearance pretty much. Or if You just want more seat pressure. They make all different sizes. From. Example .001" to .010"
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11-30-2022, 04:47 PM | #12 |
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well..... no porting really needed. Freshen the head and new springs... that's plenty. Stock heads will work fine to near 500hp no problem.
You got a baby turbo or what? |
12-01-2022, 06:09 AM | #13 | |
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12-02-2022, 09:44 PM | #14 |
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12-02-2022, 11:06 PM | #15 |
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Yha, if your not planning on upgrading that turbo and trying for big power where early spool is critical for you, leave the head alone and just replace all moving parts with oem, aftermarket if you have the extra cash. Copper valve guides are a good idea if yours are worn out and planning on keeping the car for a while.
Last edited by BlackFighter; 12-02-2022 at 11:17 PM. |
12-08-2022, 02:40 AM | #16 |
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12-08-2022, 06:30 AM | #17 |
NASIOC Vendor
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I like to run better valves (OEM size), because they stay round a true much longer than OEM, especially above OEM power levels. Performance springs on anything running higher than boost/flow, but usually I just run a smaller step up in spring pressure, unless it's a big power build.
Can you do this on stock heads? Sure. Will it perform and last as long? Not with how I drive :P |
12-08-2022, 06:40 AM | #18 | |
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Thanks! |
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12-20-2022, 04:02 PM | #19 |
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well i believe there really is no issues with the stock springs, but if you want to one day up the rev limit I think its better to over build a bit for strength sake.
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12-23-2022, 01:56 PM | #20 | |
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Quote:
what springs do you like/dislike for small builds? |
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12-23-2022, 05:00 PM | #21 | |
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Quote:
I used to prefer Ferrea but have really liked GSC stuff more recently. I'd have to look up the springs, but we use the same brand when building the heads. |
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10-13-2023, 10:38 AM | #22 | |
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10-13-2023, 10:54 AM | #23 | |
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10-13-2023, 11:58 AM | #24 |
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10-25-2023, 09:20 AM | #25 |
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