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Old 12-16-2014, 08:15 PM   #1001
Shortpersonbk
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Member#: 319017
Join Date: May 2012
Chapter/Region: MWSOC
Location: Michigan
Vehicle:
12 sti 68mm turBRO
10.48 @134 (6266)

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you would think this thread would have helped me sell the cams i have had for sale for months lol.....

surprised no one has gotten to the bottom of this yet
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Old 12-16-2014, 08:26 PM   #1002
Padilla12
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Member#: 375915
Join Date: Dec 2013
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2006 Impreza wrx sti
Grey

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Quote:
Originally Posted by Paul View Post
I'm on my phone and not going back but I don't think he listed that data. He just said he tried different clearances and no rhyme or reason why they failed. Although after some research I found this which is interesting. Also I never knew the FSM spec was so different between wrx and STI.



From this thread
forums.nasioc.com/forums/showthread.php?p=24240379#post24240379
Sti and WRX are the same clearance. 0.20mm+0.02intake and 0.35mm+0.02 exhaust.
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Old Yesterday, 04:39 PM   #1003
Paul
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Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

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Incorrect...that is STI's clearance

right from 2002-02 FSM
http://ken-gilbert.com/wrx/mans/3%20...C%20ENGINE.PDF

WRX is .20mm +/- .02 .25mm +/- .02

Went back alil in this thread and post#229 from dom has a picture of one of his build sheets. Looks like he runs what the cam companies recommend. Which makes me think Phil might be onto something from that thread I linked

Quote:
Originally Posted by Element Tuning View Post

I had Cosworth examine my buckets and cams and they said the valve lash was too tight (even though we used their spec) so we had to loosen them given the temp our engine reaches during racing.


The odd part (if lash is the issue) is why there isn't MORE failures...and why do some other cams live fine at those specs. I'm guessing usage, oil temp/pressure, ect plays a roll?
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Old Yesterday, 05:17 PM   #1004
Subie Nic
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Member#: 408745
Join Date: Dec 2014
Chapter/Region: Tri-State
Location: Upstate New York
Vehicle:
2005 STi
Black & Blue

Default Brian Corwer 272/stock Turbo

Just sharing my personal non bias experience with the BC 272 cams on my 05 Sti/STOCK TURBO setup. My intention was that i figured someday i will also upgrade the turbo, IC, etc, and while I had the motor pulled and the money, I'd just do the cams then.

My tuner (MOON PERFORMANCE, Lake Placid NY) checked valve lash and everything was still within spec with stock buckets and valvetrain. BC stated stock valves, springs, retainers would be 'OK'. No adjustments were needed and that checked out to be true. Nice. They didn't expect much out of the cams with a VF39 but neither did I, It was just a prep mod for other future upgrades to come.

OTHER SPECS: I had a catless TBE, UEL headers, TGV deletes, Intake, DW740 injectors, CC segmented clutch, and a lightweight crank pulley done in addition to this for the tune.

The car made around 300WHP and hit 350LBS of torque with 93 octane at the wheels on the stock VF-39 and stock TMIC. Keep in mind the car had like 95K miles at the time and had low compression. 125psi all the way around with 2% leakdown. (So I may have made better numbers under the right circumstances.) In perspective, they told me they had tuned an 08 model with an 18G that made about 360Lbs of torque. Most people wouldn't think cams would produce very much without a big turbo, big intercooler, big injectors, etc.. But these cams did produce more than I thought they would and we were all surprised, I was happy. Keep this in mind for those of you that are wondering about cam performance on a stock motor with only about stage 2ish in upgrades.

Anyways, 2K-3K later I've pulled the motor to upgrade internals and do head work. (Seemed to run fine, it's just an oil burning MF and I think it's time for an upgrade since the short block has never been split)

DETAILS INSIDE: My main bearings were chewed up a little, my cam journal surfaces need a polish, and my crankshaft needed polishing. Was this dirty oil, poor maintenance or something else.. I can't really say. (I'm like the vehicles 3rd owner) Anyways, cam lobes are still in good shape and my buckets are still flat and smooth. ONE THING I NOTICED.. I checked, zeroed, and checked again the bucket measurements. All of them have lost about .03-.04mm of lifter at this time. Which is about .001-.0015. I am assuming this is attributed to the increased lift of the newer camshaft..or normal wear? Everything else is in spec. I had a machine shop check the crankshaft and i re-checked it. Valves have no visual damage but some exhaust valves showed some leaking at this time. (just hydro tested them.) ALL Valve keepers have a small bump at the center of the crescent where it meets the valve grooves. Right here.. (<--->) Again, normal wear and tear or something else.. I don't know. But i Probably won't reuse the keepers.

CONCLUSION: YES these cams have performed even with a small stock turbo. Have they fallen apart, NOT YET. I have no conclusive evidence that BC has caused any mechanical issues with 1000s of miles and counting. But will update if they do.


This project is still a work in progress, if anyone is interested, I can post pics later of cam surfaces, contact surfaces, buckets, other parts, dyno sheet, etc. to give others a better idea. This is all I have right now, I'm at work. Obviously working)
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