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Old 05-08-2013, 02:29 PM   #35
Ryne @ CMS

 
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Originally Posted by thahemp View Post
Hehe... more like I apparently don't understand what they check for in a smog test. I was under the impression that once the factory cats were gone, you weren't going to pass regardless of cam.

Thanks for the cleanup Ryne. I don't want to misinform people.
well yes, but even if you have factory cats or otherwise you can still fail emissions with an aftermarket camshaft if the specs of the cam arent correct for emissions compliance .... on the overlap cycle of the motor you will essentially just pass raw unburned fuel right out the intake valve and right out the exhaust valve, so essentially the car will fail due do to high HC's. Factory cats will do one hell of a job to clean a lot of that up, especially if you get them really hot before testing, but there is a limit to how much they can clean up... my generally rule of thumb is keep the the overlap at .050" at a max of 0 degress, and under...
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Old 05-08-2013, 02:37 PM   #36
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Originally Posted by Ryne @ CMS View Post
well yes, but even if you have factory cats or otherwise you can still fail emissions with an aftermarket camshaft if the specs of the cam arent correct for emissions compliance .... on the overlap cycle of the motor you will essentially just pass raw unburned fuel right out the intake valve and right out the exhaust valve, so essentially the car will fail due do to high HC's. Factory cats will do one hell of a job to clean a lot of that up, especially if you get them really hot before testing, but there is a limit to how much they can clean up... my generally rule of thumb is keep the the overlap at .050" at a max of 0 degress, and under...
Yikes. You guys can't get away with much of anything out there.

I could have sworn this thread was in a different section. There's no way I would have been in the regional Cali forum. Obviously I don't belong here either!
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