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»	Northern California Ford Owners » Automotive » Tech Talk » Question about cams and smog

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Topic: Question about cams and smog

RioredGT
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Member # 2300

posted

Can cams keep you from passing smog? If so, why? I'm about to throw a set of ported and polished svo heads in my 98 gt and wanted to put cams in there at the same time to try and get the most gain, but wasn't sure if they'd keep from passing smog.

Posts: 410 | From: Bay Area | Registered: Jan 2003 | :

KCmustangboy
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Member # 1927

posted

YES! cams will keep you from passing smog, you need to find someone who has a lot of cam know-how and ask how much of a cam you can run and still pass. They are a few smog guys on here I am sure they would be glad to tell you what the most you can do is. Although remember just because it "should" pass doesn't always mean it will. But than again that could work the other way in your benefit.

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03 Cobra... Factory long block, with Whipple and AED tune... 812rwhp 10.0s @ 140... almost there!

WWW.AEDHP.COM

Posts: 1691 | From: San Jose, CA | Registered: Oct 2002 | :

66 AC COBRA
Nitrous King
Member # 904

posted

when u smog it, make sure u have a stock h pipe on it with good cats, this is very important, if u are going long tubes, ur gonna have problems anyway

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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5

Posts: 6280 | From: Winters | Registered: Feb 2002 | :

BlackNGold
CaliforniaFords.com
Moderator
Member # 655

posted

Basically~~Cams make horsepower by letting more air/fuel in the cylinders....More air/fuel in the cylinders means more air/fuel comes out...The smog machine picks up on the added exhaust gas and fails the smog....

I'm sure a set of 99 PI cams sould give some added power and are still emmision legal...If you put some aftermarket cams in your engine, just ask the manufacture if they are smog legal...

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-SLOWER TRAFFIC KEEP RIGHT-

Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001 | :

66 AC COBRA
Nitrous King
Member # 904

posted

some cams arent smog legal but will easily pass smog, like the b 303 or f 330 still weaknuts cams but they will pass and are considered "illegal"

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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5

Posts: 6280 | From: Winters | Registered: Feb 2002 | :

Wolfie351
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Member # 651

posted

The problem with aftermarket cams is the overlap that may let unburned fuel go through the exhaust valves at idle. With the new treadmill testing, it's my understanding that there is no idle test which would greatly help people with stout cams. I pass just fine with a 351W and F cam.

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1985 Mustang GT: 351W, Griggs, Baer, etc etc

Posts: 1214 | From: South Bay | Registered: Dec 2001 | :

RioredGT
¯
Member # 2300

posted

Thanks for the input guys. I'll be checking with comp cams and SHM to see what they have to say about their cams.

Posts: 410 | From: Bay Area | Registered: Jan 2003 | :

Jimbo
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Member # 1456

posted

Cam companies will hesitate to say their cams will pass unless they have gotten a CARB EO# for the particular part. Not too familiar with 4.6 cams out their but I'd check for some cams with a CARB EO# first and see if their are any you like. As it has already been mentioned, the new(to the bay area) dyno smog checks will probably favor cars with a bit of a rough idle, seeing as how there is no idle test.

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1965 Mustang Coupe
EFI, 302ci, T-5, 3.70's.
Click for My Mustang Pics

Posts: 352 | From: Castro Valley,CA | Registered: Jun 2002 | :

mustanggt5091
All I need is.....
Member # 444

posted