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Old 08-29-2007, 08:02 PM   #1
2.5SR40WRX
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Default Shimless bucket question...

Does anyone know the range of shimless buckets available from subaru? I am building a set of heads with used Supertech valves and new Cosworth cams. The clearances are supposed to be anywhere from .008 to .010 and the closest I have is .012 and the worst is .028. Please help me if you can. Thanks

Ron Wood
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Old 08-31-2007, 03:01 AM   #2
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Ron, did you have the buckets matched to the head?
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Old 08-31-2007, 10:15 AM   #3
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The range is quite large. I believe they only sell them in even numbers now for some reason. I set lash on a bunch of subaru heads and the lowest i think i have seen is a .470 up to a .510 i think. I think they may go a bit lower then .470 and a bit higher then .510.
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Old 09-01-2007, 10:34 AM   #4
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I would say instead of buying the shimless buckets at $26 x16 = $416 plus tax, if you buy them from a local suby dealer that is, i would just take the whole thing to your local suby machine shop. they machined the head, set the lash by machining the buckets, and they installed all my aftermarket valves, NEW valveguides (included in the cost they charged me), springs, retainers, and cams, all done with assembly lube, and my head was ready to go for $400 out the door. I was just going to buy the buckets myself and set the lash myself till they told me they would do all that stuff for me for less then what i would pay for my buckets alone. Just wanted to let ya know. Good luck with the build.

Last edited by WrXtaCy2003; 07-12-2010 at 11:59 PM. Reason: realized something
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Old 09-01-2007, 02:15 PM   #5
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try here, sti service manual. You can find all the sizes and part numbers http://ken-gilbert.com/wrx/STi_Manual/index.htm
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Old 09-02-2007, 03:00 PM   #6
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Well I work at a machine shop here in Chicago and the largest buckets we have are .503's and I'm still off more than .010 almost all my clearances. P&L is the place that I had do my heads last time and whoever does their machine work adjusted the head by taking material off the stem of the valve instead of getting the right buckets to match the valves. Now I'm trying to use those same valves in my new setup and I'm having a difficult time. My fear is that I'm going to have to buy all new valves since they took so much off the top of them. This wasn't something done by P&L personally, I'm 100% not bashing them by any means. The work they do up there is great. So if .510 is as big as the buckets go then it looks like I need to get some new valves.
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Old 09-02-2007, 03:08 PM   #7
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From what the service manual says the bucket size goes up to 5.65. Looks like I'm gonna be able to pull it off. I'll measure them again on tuesday and do the math. I'll let you know the results then. Thanks for the link sjl1614 and for everyone elses help.

Ron Wood
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Old 09-03-2007, 12:31 AM   #8
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Does anyone have any recommendations on head gaskets? I have a new STI shortblock with 2.0 heads with 1/2mm over supertech valves, cosworth 275 cams, cosworth dual valve springs/titanium retainers, Pro P&P. I know the Cometics are good but I want my compression ratio to be correct. I've also seen the Cosworth gaskets, and I already have a set of OEM gaskets. Which ones should I use?

Do I get gaskets for a 2.5 or a 2o?

Last edited by 2.5SR40WRX; 09-03-2007 at 03:13 PM.
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Old 09-03-2007, 07:14 PM   #9
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Quote:
Originally Posted by 2.5SR40WRX View Post
Does anyone have any recommendations on head gaskets? I have a new STI shortblock with 2.0 heads with 1/2mm over supertech valves, cosworth 275 cams, cosworth dual valve springs/titanium retainers, Pro P&P. I know the Cometics are good but I want my compression ratio to be correct. I've also seen the Cosworth gaskets, and I already have a set of OEM gaskets. Which ones should I use?

Do I get gaskets for a 2.5 or a 2o?
You get the 2.5l headgasket. As for which one, what CR are you aiming for?? I think oem gasket on a hybrid puts it around 9:1?? Correct me if i am wrong on that
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Old 09-03-2007, 08:14 PM   #10
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Quote:
Originally Posted by 2.5SR40WRX View Post
Does anyone have any recommendations on head gaskets? I have a new STI shortblock with 2.0 heads with 1/2mm over supertech valves, cosworth 275 cams, cosworth dual valve springs/titanium retainers, Pro P&P. I know the Cometics are good but I want my compression ratio to be correct. I've also seen the Cosworth gaskets, and I already have a set of OEM gaskets. Which ones should I use?

Do I get gaskets for a 2.5 or a 2o?
You must get the 2.5l gasket, the 2.0 is too small. You can call cometic and get any thickness gaskets you want.
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Old 09-03-2007, 10:21 PM   #11
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Honestly I don't know what CR I'm shooting for. I read on here, someone said that it doesn't matter as long as you have a good tuner, and I have a good tuner. What CR is good?
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Old 09-03-2007, 11:26 PM   #12
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Well the higher the compression ration the faster the turbo will spool up but you are more prone to detonation. I would say you are safe using the oem gasket. 9:1 is a reasonable cr imho.
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Old 09-04-2007, 12:39 AM   #13
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Quote:
Originally Posted by 2.5SR40WRX View Post
Well I work at a machine shop here in Chicago and the largest buckets we have are .503's and I'm still off more than .010 almost all my clearances. P&L is the place that I had do my heads last time and whoever does their machine work adjusted the head by taking material off the stem of the valve instead of getting the right buckets to match the valves. Now I'm trying to use those same valves in my new setup and I'm having a difficult time. My fear is that I'm going to have to buy all new valves since they took so much off the top of them. This wasn't something done by P&L personally, I'm 100% not bashing them by any means. The work they do up there is great. So if .510 is as big as the buckets go then it looks like I need to get some new valves.
As probably already know you can bring stem height back up a bit by having the seats cut and grinding the valve faces a little bit...There's nothing wrong with setting lash by grinding the stem tips a little bit, especially on Supertech valves, as it seems they have trouble making 2 valves in 16 the same length.
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Old 09-04-2007, 01:16 AM   #14
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I know, but I don't want to sink the seats too much and I definitely don't want to make the face too thin. It looks like with all the ways I can bring it closer to spec that I'm not going to have a problem. I have 2 new valves and I'll measure the length of them and compare them to the old valves. I will find out for sure this week and I will post with updates before Wednesday.

What is a high CR and what is a low CR? Is the 9:1 going to give me good spool?
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Old 09-04-2007, 01:29 AM   #15
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Old 09-04-2007, 09:03 PM   #16
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Quote:
Originally Posted by Super Nintendo View Post

That is pretty good info there, but how accurate is that? Im not sure if I am a great fan of PDX.
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Old 09-04-2007, 10:15 PM   #17
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Talked to my Tuner today and he said to shoot for 8 to 8.5:1 I'm not going to be drag racing this car, yeah right, but I'm gonna try not to. I told him I want my car to be STRONG on the highway and that's the CR he told me shoot for. I also bought the Accessport V2 today since I sold my UTEC. Hope it was worth it. As far as the buckets go, I'm going to order buckets .001 larger than my reading, so I have a little bit of room for error, I can take .001 or .002 off the stem to get them right. I was also told that the Subaru valvetrain tends to tighten up after they are installed and running for a while, causing noise, has anyone experienced this?
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Old 09-05-2007, 09:38 PM   #18
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I assembled and measured one head, I need 2 exhaust valves, I ordered them today. Cosworth 275 cams require .008 clearance on the intake and .010 on the exhaust . Here are my readings:

Left Intake cam
Bucket size
1.502
2.502
3.503
4.502
Cam to bucket clearance
1. .020
2. .020
3. .021
4. .014

Left Exhaust cam
Bucket size
1.500
2.501
3.503
4.501
Cam to bucket clearance
1. .022
2. .030
3. .019
4. .022
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Old 09-05-2007, 09:57 PM   #19
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I'll order buckets as soon as I assemble the Right Side head. The largest bucket that Subaru carries is a 565, which is actually a 5.65mm bucket. I'm going to order them .01mm over sized to be safe, I can always take .01mm off of the top of the valve stem. Buckets that I'm going to order for the left head are:
L-IN
1.523
2.523
3.525
4.517
L-EX
1.523
2.532
3.523
4.524
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