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Old 09-03-2010, 03:54 PM   #1
johnathon.sprague
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Default EJ20 heads with STI cams valve lash specs

I am checking valve lash on my hybrid right now. I am using 2.0 heads and STI cams. I am unsure of what specs to use. Please help!?

04 STI manual says
intake .20mm (+.04, -.06)
exhaust .35mm (+-.05)

02 WRX manual says
intake .20mm (+-.02)
exhaust .25mm (+-.02)
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Old 09-03-2010, 04:08 PM   #2
paintbing
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Use the lash that comes with the valves you are using. (ie if you're using the WRX valves, then use the wrx lash specs).

This is due to the different expansion rates the valves(stems) will see during operating temperatures.

ALSO, Since we are on the topic of valves and lash specs - Can somebody tell me how much you can grind from the tip of the valve before you grind through the outside hard layer? I'm getting the heads back today from the machine shop mild combustion chamber work, multi-angle valve job etc... Since my lash is going to be super-duper tight now, I want to tip my valves slightly so that I can use my 50+ assortment of buckets to set the lash. Smallest I have is 480 to largest 508. Majority in the low 490's... I'm sure without tipping, I'll need buckets in the 470 range.

Thanks!
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Old 09-03-2010, 05:01 PM   #3
johnathon.sprague
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How can I tell which valves I have? I bought the heads assembled with STI cams but the guy didn't say whether it was STI or WRX valves.
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Old 09-03-2010, 05:17 PM   #4
paintbing
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I'll post up the markings on the WRX valves (if any). But knowing the lash is the same for intake, you are at least 50% of the way there. (use the tighter clearance regardless).
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Old 09-03-2010, 06:30 PM   #5
paintbing
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I dropped by the machine shop today, but they couldn't locate my valves. Anyway, what do yours say?
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Old 09-03-2010, 08:06 PM   #6
johnathon.sprague
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They say ID1 and ED3. I took a look at my old WRX heads and they say ID2 and ED2. They look the same otherwise. I am almost finished torquing the head bolts and then I will see what the specs look like. They guy I bought them from said he had them lashed but I wanted to double check.
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Old 09-03-2010, 08:34 PM   #7
paintbing
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You need to re-lash after you torque the head. I just found some old valves - They have what looks to be a star-trek symbol and then T-ED2

The I is for intake and E for exhaust. Not sure what the T or D2 is for...
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Old 09-13-2010, 12:47 AM   #8
7ommy7urbo
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i would definately set valve lash on the loose end of the spec as opposed to the tighter side, a tight valve lash can cause a misfire in the engine, a looser adjustment will make a little more noise, which is what id prefer. thats just my personal opinion and experience learned over the years working on Subie's though
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