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Old 04-01-2013, 03:10 PM   #26
Marnix
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Shims do get to wander about now and then when revving beyond 7500 rpm on EJ20K heads or 7k on EJ20G heads, so far I have seen 2 heads destroyed in the 15 years these engines have been about. Slim chance for it to happen, but a risk none the less.
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Old 04-01-2013, 07:10 PM   #27
2slofouru
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Any extra safety margin I can afford is what my plans are. I"ve been running my ej20k on 93 pump since 09 with no issues but the 257 block I'm installing with these "built" heads probably needs a little more tlc to make it rugged. Thanks again, Marnix.
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Old 04-01-2013, 08:57 PM   #28
tenchu
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Loving all the info in this thread.... I really gotta get to building my spare motor.. Did you ever end up going shimless Marnix?
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Old 04-02-2013, 02:56 PM   #29
wrxr4ti
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I rebuild my k heads not too long ago, Im using 25d valves, stock k springs,retainter and keepers, with 30r exhaust buckets, haven't had and trouble yet, and it loves to reach 8k with the quickness.
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Old 04-02-2013, 08:49 PM   #30
2slofouru
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So did you tip cut the valves or buy different shims to get your clearances correct? I will have to wait about a week and a half just to get the first shim from them. Sucks it has to be sent to them first (one week) and THEN come to me (half to whole week). People with ez30r engines must be afraid to part them out, or maybe they rarely split them to even see the insides. You would think with the swaps that have been going on forever that there would be more of these buckets available used.

Do you know anyone who has some I could use for reference at least... so I don't have to wait forever from the dealer for one?

I asked a couple of questions about this in the RS25 h6 thread and got zero help, its almost like they had their own little h6 universe and didn't want to bother with anything out of that realm.

I'll probably have to change my spring and retainer plan, the bc0600 springs aren't being compressed enough to have the correct seat pressure. They are only compressed to 1.65" when spec is 1.42". I either have to find lower spring shims to fit under the crowers (yeah right) or buy all new springs and retainers. I just love how people give advice on what to use then diappear when you come back asking why things aren't compatible.


Internet advice...because no accountability.

Last edited by 2slofouru; 04-02-2013 at 08:56 PM.
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Old 04-07-2013, 04:46 PM   #31
2slofouru
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A little bump for spring advice. I want to use titanium retainers and aftermarket springs but the ones I have aren't compressed enough to get 60lbs seat pressure. They are the Brian Crower BC0600 setup with 1.42" required height and titanium retainers. They are only compressed to 1.65" currently.
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Old 04-10-2013, 01:56 PM   #32
elislider
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Here are the part numbers for the EZ30R buckets (item 12)
http://opposedforces.com/parts/legac...llustration_1/
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Old 04-10-2013, 10:30 PM   #33
2slofouru
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Thanks a bunch, Marnix already listed them in another thread. I have three on the way from the dealer (hopefully) and will be measuring them asap. I just have to get the valve spring spacers/locators sorted out now, no one seems to know squat about running the usdm springs in the jdm heads. Looks like I'll need about 6mm spacers to fit the usdm wrx spring diameters (or my crower springs) . I've emailed a few companies with no replies. I'm going to try and remember to call supertech tomorrow.
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Old 04-11-2013, 12:47 AM   #34
elislider
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Agreed, there is very little hard knowledge on spring interchangeability. I will have questions eventually, when I try to put crower springs and cosworth cams into v5/6 STi heads
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Old 04-11-2013, 11:42 PM   #35
2slofouru
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Measured some buckets today, the solid reference ones came in.

Solid 33mm bucket: 30 grams
Shim under bucket: 35.3 grams
Shim over bucket: 46.3 grams

So a decent savings from the solid to the shim over, but only a few grams savings over the shim under. Either way, I'm running the solids now so all 16 buckets will add up. Also measured one head tonight and will do the other soon.

I still need to find some 5mm lower spring spacers/locators, haven't had any replies from vendors or anyone else so far. The 5mm locators come in the supertech dual spring kit for the sohc 2.5 so it may be tough finding someone who went that route.
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Old 04-13-2013, 04:56 PM   #36
2slofouru
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Bump, anyone have any subaru aftermarket thicker spring locators they could measure for reference? I've found supertech has multiple locator part numbers and so does ferrea.

Ferrea SL1038 - ? thickness
Ferrea SL1051 - ? thickness

Supertech SEAT-TS/SUB - ? thickness
SEAT-TS/SUB1 - ? thickness
SEAT-TS/SUB4 - ? thickness
SEAT-TS/SUB5 - ? thickness
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Old 04-15-2013, 07:40 AM   #37
2slofouru
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Had some spare time Saturday, and took a few measurements out of necessity and curiosity.

First we'll start with random valve component weights.

VALVES

EJ25d/20k oem Intake valve - 49g

EJ25d/20k oem Exhaust valve - 47.1g

Supertech Inconel Ex valve - 51.8g (the face isn't as dished as the oems)

Supertech stainless In valve- ???? (forgot to measure)


Valve buckets/followers

EJ25d/20k shim over bucket - 46.3g (with shim)

EJ20k(sti) shim under bucket - 35.3 (with shim)

EZ30R solid bucket - 30g


Valve RETAINERS

EJ25/20k shim over retainer - 9.4g

EJ20k shim under retainer - 15.6g

Brian Crower (ej205+) Ti retainer - 6.7g



Here are some lengths / sizes of valve springs:

EJ25d/20ksti height - 48.2mm
OD - 24.68mm
ID - 17.38mm
coil dia - 3.58mm

EJ20k wrx longer spring - 56.13mm
OD - 25.7mm
ID - 18.19mm
coil dia - 3.58mm

Crower bc1600 height - 46.75mm
OD - 26.83mm
ID - 19.11mm
coil dia - 3.76mm



As you can see, the Crower springs have a larger OD so they are closer to hitting the inside of the valve buckets should the spring not be perfectly straight. The ID of the buckets isn't much larger than the OD of the crowers because there is a thick lip along the lower inner edge of the buckets. Supertech's site lists their springs as 28mm OD for the ez30 which uses the same buckets I'm using so that is pretty tight also. Of course a lot of their information is not accurate, like listing the ej25d valves as 122mm long.

I may have to start over with my spring and retainer setup so my BC0600 set may be up for sale soon. I also need to get the seats cut in one head again, because those valves are sitting several thousandths higher into the chamber than the other head, and the buckets would need to be substantially thicker. No telling how long it will be before I find a compatible spring and retainer setup for my heads now.
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