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CC Advertisers
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04-06-2005, 11:10 AM
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CC Member
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Join Date: Feb 2005
Location: Oxnard,
ca
Cobra Make, Engine: superperformance, 427 side oiler
Posts: 178
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Not Ranked
CA smog test
Just went to the BAR referee yesterday with my 1967 427 sideoiler. Non SB-100 and must pass 1967 smog standards for HC emissions. The 2500 rpm test with 218ppm measured, 600ppm allowed. However, the engine failed the idle test miserably with 2686ppm measured, 700ppm allowed. Any ideas how to get the emissions down at idle? Widen plug gaps, backoff initial timing, lean the carb. I need an expert mechanic in this area (Los Angeles/Orange County) to perform this miracle. This is my last hurdle to get a 2year green light to operate, and hopefully obtain a SB-100 number.
Thanks, Bill
__________________
... and when you start your Cobra its inner voice shouts at you "You f***ing assh*le, this time I'm going to kill you."
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04-06-2005, 11:16 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
You Have Mail
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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04-06-2005, 11:40 AM
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Senior Club Cobra Member
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Join Date: Nov 1999
Location: Folsom,
CA
Cobra Make, Engine: ERA 623, 427 S/C Cobra. Ford FE 428 Cobra Jet, Ford Nascar TL 4speed - with a touch of raw; "less is more" theme
Posts: 3,880
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Not Ranked
That idle test is a real killer. I tried it with smaller carb, jetting, and yes known fuel adds, tuning, more tuning, and then some. I passed it with my last 282 cam in my last car - just barely, but anything with a more radical cam seems to put it on tilt for the idle test.
It was amazing to see how much modulation/difference there was at the 900rpm idle test as compared to the 2500 test. Short of swapping out the cam or backing off the rockers to a point where its risky, there were no other options for me to try. 
__________________
Duane
Western States Cobra Group 1998-2016.
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04-09-2005, 01:14 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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Not Ranked
Using a PCV valve will lean you out... not likely 2000 ppm. I'd gap my plugs at .055 if you are using an MSD. Running a 195 thermostat will help and run Autolite 45 or hotter plugs. I'd even run platinums during the testing process.
If that fails I have a pair of 450 holleys ready to put on you can use for the test. They ran well under 350 ppm...
What is your intake vacuum at idle??? If it's 5-6 or lower (common on 8V 427's) your power valves are likely open at idle. 600 cfm holley's use 8's for which 11" of vacuum is needed to keep them closed. If you are at or within 3 inches (if you engine idles at 8" of vacuum you want to use a pair of #5 power valves.)
Hope this helps,
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
Last edited by SCOBRAC; 04-09-2005 at 01:19 PM..
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04-09-2005, 02:38 PM
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Senior Club Cobra Member
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Join Date: Nov 1999
Location: Folsom,
CA
Cobra Make, Engine: ERA 623, 427 S/C Cobra. Ford FE 428 Cobra Jet, Ford Nascar TL 4speed - with a touch of raw; "less is more" theme
Posts: 3,880
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Not Ranked
I ran 4.0 power valves with 9" of vacuum and still did not pass with the 450 holley on the idle test. Once above 282 on the cam, the numbers are off the chart on the idle test.
I was able to get my last motor, exact same setup, to pass with the 282 cam, and a slightly smaller one before that. Once I tried it with the 295-300 duration cams - no dice!
__________________
Duane
Western States Cobra Group 1998-2016.
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04-11-2005, 04:17 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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Not Ranked
There's aways Jan. 2... I suggest getting there early. Another option is to run on alcohol... No Hc's...
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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04-12-2005, 09:28 AM
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CC Member
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Join Date: Feb 2005
Location: Oxnard,
ca
Cobra Make, Engine: superperformance, 427 side oiler
Posts: 178
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Not Ranked
Thanks for the info, keep it coming. Probably will not tackle this problem until after April 15th.
Bill
__________________
... and when you start your Cobra its inner voice shouts at you "You f***ing assh*le, this time I'm going to kill you."
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