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Old 09-11-2007, 10:09 PM   #1
turbobaby
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Default 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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Old 09-11-2007, 10:13 PM   #2
jays05
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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?
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Old 09-11-2007, 10:14 PM   #3
S L O W W R X
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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
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Old 09-11-2007, 10:27 PM   #4
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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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Old 09-12-2007, 09:14 AM   #5
THE-95-STi
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Quote:
Originally Posted by S L O W W R X View Post
There is a thread in Proven Power bragging. Phil from Element as well as Scott Siegel from Batlground have both had issues recently.

Matt
Well Phil put a set in my motor and I don't seem to have any problems at the moment
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Old 09-12-2007, 12:39 PM   #6
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Quote:
Originally Posted by PSM-04-STi View Post
Well Phil put a set in my motor and I don't seem to have any problems at the moment
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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Old 09-12-2007, 09:06 AM   #7
Nate8409
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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.
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Old 09-12-2007, 11:07 AM   #8
jays05
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Quote:
Originally Posted by Nate8409 View Post
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.
That is specifically what I was asking about, not the engine break-in.

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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Old 09-12-2007, 11:27 AM   #9
Devan M
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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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Old 09-12-2007, 09:42 PM   #10
turbobaby
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Quote:
Originally Posted by jays05 View Post
That is specifically what I was asking about, not the engine break-in.

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.
Yes, the engine ran at 1500 rpm for 30 minutes.
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Old 09-12-2007, 01:01 PM   #11
THE-95-STi
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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:
Originally Posted by Element Tuning View Post
Now we built two motors back to back, one for a customer and one for our Time Attack car. The customer's motor with these cams has normal vacuum at around 18-19 inHg and normal spoolup from my experience with these camshafts. I had to wait for my camshafts as they came in on a different shipment than the other set. We verified the camshafts and all the specifications of our build as we keep meticulous records and pictures that show the part numbers of the camshafts in the head. I will be shocked if these cams come back measured to advertised specification given my normal experience with them.

Thanks,
Phil
www.elementtuning.com
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Old 09-12-2007, 01:16 PM   #12
Junior2JZ
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Knocking noise after about 2k and 5 track passes.. ended up being a broken spring.

Junior
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Old 09-12-2007, 02:47 PM   #13
jays05
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Quote:
Originally Posted by Junior2JZ View Post
Knocking noise after about 2k and 5 track passes.. ended up being a broken spring.

Junior
That car was using ignition-cut LC/FFS right?
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Old 09-12-2007, 04:22 PM   #14
Junior2JZ
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Quote:
Originally Posted by jays05 View Post
That car was using ignition-cut LC/FFS right?
The 07 from the vids is fine. This was another car an 06 with low miles.. It was using FFS and LC. It broke after the first pass with the LC + FFS on
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