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09-11-2007, 10:09 PM | #1 |
Scooby Newbie
Member#: 102564
Join Date: Dec 2005
Location: Toronto, Canada
Vehicle:05 STi BLUE |
Cosworth cams
Anybody have issues with the quality of the cosworth STi cam.
Long story short, I have a built motor that uses these cams, after 300 miles of break in I noticed some knocking noise from cylinder 3. My builder and I took a look as we thought their was something wrong with the shim or bucket. To our amazement the lobes on the intake cam were worn down The other 3 cams were fine, so I wondering if anybody us had quality control issues with these cams?
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09-11-2007, 10:13 PM | #2 |
Scooby Specialist
Member#: 78165
Join Date: Dec 2004
Chapter/Region:
South East
Location: SC
Vehicle:05 STI 35r + e85 |
I have the cossie 278/274 avcs cams and so far so good... 3500 miles and no issues, noises, etc.
How did you break in the cams? |
09-11-2007, 10:14 PM | #3 |
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Join Date: Sep 2005
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There is a thread in Proven Power bragging. Phil from Element as well as Scott Siegel from Batlground have both had issues recently.
Matt |
09-11-2007, 10:27 PM | #4 |
Scooby Newbie
Member#: 102564
Join Date: Dec 2005
Location: Toronto, Canada
Vehicle:05 STi BLUE |
Broken in properly, less than 10 psi, 4000 rpm limit. The other 3 cams were fine and the clearance was the same measurement as before. Only faulty cam clearance was drastically off. I am guessing the material the lobes were made out of were not hardened properly, but I not an engineer. Just can't believe cosworth/kelford would put out something like this
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09-12-2007, 09:06 AM | #5 |
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NESIC
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Vehicle:2006 Global Cooler Black |
The lobes are not made of anything. The whole camshaft is cast with no grinding or shape. Then they are ground to predefined specs, lift diration... and then later hardened.
I would also ask about break in. There are instructions along the lines of put the motor at 1500 rpm for 5 minutes etc etc. |
09-12-2007, 09:14 AM | #6 |
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Location: Charleston SC
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09-12-2007, 11:07 AM | #7 | |
Scooby Specialist
Member#: 78165
Join Date: Dec 2004
Chapter/Region:
South East
Location: SC
Vehicle:05 STI 35r + e85 |
Quote:
I ran mine between 1500-2000rpm for 30-45 minutes right after the initial startup. If this step was skipped I would not be surprised about excessive cam lobe wear. |
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09-12-2007, 11:27 AM | #8 |
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Location: Team Crawford Performance
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If you did not do the break-in right, I would think all the cams would be wrecked
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09-12-2007, 12:39 PM | #9 |
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Vehicle:2008 STI DGM |
Phil said thats the reason he went with cosworth cams, all the ones he installed for customers worked great but when he installed his, they didnt work out so well. Now hes running stocks again.
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09-12-2007, 01:01 PM | #10 | |
Scooby Guru
Member#: 113734
Join Date: Apr 2006
Chapter/Region:
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Location: Charleston SC
Vehicle:2023 FL5 Type R Subaruless |
I saw that thread, He built his motor right after mine
my car hasn't been fully tuned yet although the car appears ok at the moment Quote:
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09-12-2007, 01:16 PM | #11 |
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Tri-State
Location: Tuning 8/9sec Subies all over
Vehicle:10.8 XT+9.2@155 GR+ 9.1/157mph 2015 STI |
Knocking noise after about 2k and 5 track passes.. ended up being a broken spring.
Junior |
09-12-2007, 02:47 PM | #12 |
Scooby Specialist
Member#: 78165
Join Date: Dec 2004
Chapter/Region:
South East
Location: SC
Vehicle:05 STI 35r + e85 |
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09-12-2007, 04:22 PM | #13 |
Scooby Guru
Member#: 64908
Join Date: Jun 2004
Chapter/Region:
Tri-State
Location: Tuning 8/9sec Subies all over
Vehicle:10.8 XT+9.2@155 GR+ 9.1/157mph 2015 STI |
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09-12-2007, 09:42 PM | #14 |
Scooby Newbie
Member#: 102564
Join Date: Dec 2005
Location: Toronto, Canada
Vehicle:05 STi BLUE |
Yes, the engine ran at 1500 rpm for 30 minutes.
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