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Old 03-28-2009, 04:43 PM   #1
shutupnshift04
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Default valve clearance horribly off compared to stock cams

Okay so im finally getting my motor together and i go to check the valve clearance on my web 264 cams and i can park a bus under it(not literally duhhh) I put the stock cams back on and the clearences are right in check all around .20....now theres noooooo wayyy im going back to stock cams after i bought these but i cant stand to have my motor apart anymore.. the aftermarket cams are well over .9 clearance(thats all my feeler guage goes up to) is it even possible to shim the valve that much? Was there an error when disigning these cams? i dont see why they would even touch anything else but the lift and duration why is the clearance off when its not even on the cam "runner". please give me a sugestion.
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Old 03-28-2009, 04:49 PM   #2
kevinh211
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you can't just drop in cams. you need larger buckets to get the correct clearances for what ever your cam manufacture suggest.
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Old 03-28-2009, 05:06 PM   #3
shutupnshift04
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I know that however the largest subaru shim you can buy is 2.7 most of my shims in my heads are 2.55 so that means i would only get a .15 of adjustment out of it when i need atleast like a .9 increase which is impossible? UNless your talking about bigger brand new buckets all together?
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Old 03-28-2009, 05:34 PM   #4
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Okay so after further reading up on it all the 2003 and newer motors have shimless buckets (i have a early 2002 wrx) is it possible that this cam is made for a newer wrx and thats y the clearance is so DRAMATICALLY off? I just cant see how its pysically possible to get that much clearance out of these buckets
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Old 03-28-2009, 06:22 PM   #5
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Id strongly recommend switching to shimless buckets...

-Jerod
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Old 03-28-2009, 06:34 PM   #6
shutupnshift04
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yea but what im trying to figure out is will the shimless buckets make up for that GINORMOUS gap? its not like were talking about a small .08 adjustment im talking about it needs an extra like 1.1 before the cams even come close to the buckets
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Old 03-28-2009, 08:17 PM   #7
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Read post #16 in this thread for new bucket sizes: http://forums.nasioc.com/forums/show....php?t=1727455

Good job, at least you measured them and did not just think they would run.
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Old 03-29-2009, 12:21 AM   #8
shutupnshift04
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maybe you guys dont get what im saying?.....the shims in my head are the 2.55 shims. The biggest shim size is a 2.7.(from what i found on alldata) The gap between the bucket and the cam is 1.1. so increasing to a 2.7 from my 2.55 would only increase .15 to my buckets when i need 1.1 so even with the biggest shim installed i would still be about .85 over gapped. is there a problem with my cam? or can going to shimless buckets really make up that entire 1.1 of clearance
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Old 03-29-2009, 12:33 AM   #9
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Is there any chance that your cams require longer valves ( past the valve spring retainers) I know when you install roller rockers on a small block chev it sometimes requires longer valves, and you can regrind the tips for proper length as well.
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Old 03-29-2009, 12:57 AM   #10
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I'm not sure you are able to measure what you have properly. You are using decimal point places that mean nothing to me. 1.1 is 1 inch and .100 thousandths. .15 is .150 thousandths. .85 is .850 thousandths, .750 is 3/4 of a inch. 2.7 is 2 inches .700 thousandths. I think you need to learn to measure with feeler gauges and add in thousandths. .1 is 1 tenth,.01 is 1 hundreth, .001 is 1 thousandth, .0001 is 1 ten thousandth. Then use a known thickness bucket and stack feeler gauge blades and add them to the known thickness to see what you need for new buckets. Any time you change cams you will need to get new buckets to fit the new cams. You will need a 1 inch mike to measure the old buckets to see what the thicknesses are to start with.
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Old 03-29-2009, 01:47 AM   #11
mick_the_ginge
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I think he is talking in mm.

We are saying you need to ditch the shim under bucket and buy a set of shimless buckets. You will need to measure each to work out what size you need.

I doubt their is anything wrong with the cams
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Old 03-29-2009, 03:06 PM   #12
shutupnshift04
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Okay thats what i was looking for yes i was talking in mm as thats the way to properly check the clearance as subaru manual calls for .20 mm clearance and its at about 1.1 clearance
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Old 03-30-2009, 02:31 AM   #13
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After sleeping last night the thought occured to me that maybe the cams are stock cams reground and that would mean the base circle is smaller than the stock cam. They grind the base down and that gives the cam more lift.
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Old 03-30-2009, 09:48 AM   #14
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^^^yup, web does regrinds changing the base circle...they also do new cams too, I believe. So time to wait for the OP to respond back.
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Old 04-02-2009, 09:21 PM   #15
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Quote:
Originally Posted by charliew View Post
After sleeping last night the thought occured to me that maybe the cams are stock cams reground and that would mean the base circle is smaller than the stock cam. They grind the base down and that gives the cam more lift.
is this a common or a worth while route in getting more out of the stock cams? are there any pros or cons to this?
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Old 04-03-2009, 01:29 AM   #16
STIBungy
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When I put my BC cams in and measured valve lash, I ended up having to buy 6 or 8 new buckets. The whole time I was cursing and kicking since I'm so used to only having to use a flathead and 10mm wrench to adjust valve lash on Hondas.
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