idle mixture screws
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 1,235
Likes: 0
From: Mesa AZ
idle mixture screws
on an edelbrock carb do you turn the screws clockwise or counterclockwise to get a lean idle mixture?
some say that you turn them clockwise to lean it out but when i first put the carb on my car, the catalytic converters were getting red hot indicating a rich mixture, so to fix this i turned the screws counterclockwise thinking it was leaning it out and that worked.
so turning them which way does what?
some say that you turn them clockwise to lean it out but when i first put the carb on my car, the catalytic converters were getting red hot indicating a rich mixture, so to fix this i turned the screws counterclockwise thinking it was leaning it out and that worked.
so turning them which way does what?
Safety Car
Joined: Jul 2002
Posts: 4,269
Likes: 3
From: St. Charles IL
Cruise-In 5-6-7-8-9-11-12 Veteran
A CI-6 Car Show Winner
Correct me if I'm wrong, but I thought our smog motors were supposed to run a little rich so the un-burned fuel would burn in the catalytic converter and cause it to heat up and operate more efficiently.
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Originally Posted by chris75stingray
on an edelbrock carb do you turn the screws clockwise or counterclockwise to get a lean idle mixture?
some say that you turn them clockwise to lean it out but when i first put the carb on my car, the catalytic converters were getting red hot indicating a rich mixture, so to fix this i turned the screws counterclockwise thinking it was leaning it out and that worked.
so turning them which way does what?
some say that you turn them clockwise to lean it out but when i first put the carb on my car, the catalytic converters were getting red hot indicating a rich mixture, so to fix this i turned the screws counterclockwise thinking it was leaning it out and that worked.
so turning them which way does what?
http://neptune.spacebears.com/cars/stories/carb.html
Pro
Joined: Jan 2002
Posts: 624
Likes: 0
From: Marietta ga
Originally Posted by Big Fish
Correct me if I'm wrong, but I thought our smog motors were supposed to run a little rich so the un-burned fuel would burn in the catalytic converter and cause it to heat up and operate more efficiently.
too rich is usualy not a good idea unless you are building a forced induction or nos application.
Safety Car
Joined: Feb 2006
Posts: 4,855
Likes: 2
From: Columbia South Carolina
Originally Posted by kb2fzq
Safety Car
Joined: Jul 2002
Posts: 4,269
Likes: 3
From: St. Charles IL
Cruise-In 5-6-7-8-9-11-12 Veteran
A CI-6 Car Show Winner
Originally Posted by Cory1970
if you want to loose power and backfire in the exhaust.........
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
Nice car! mine used to look something like that! Now, she's a beauty. I would just remove the cat and replace it with a straight pipe. I did it to mine. I can't remember where I got it but I think it was Corvette America. If you remove it, retune the carb to your liking and you're done.
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
I don't know where you live but I don't think there is any state, maybe CA, where a 31 year old car needs emissions testing. I'm in NY and here, I think if a car is 25 yrs. old it's automatically exempt. Every year I need just a safety inspection. Check on your states DMV site.
Melting Slicks
Joined: Mar 2006
Posts: 3,443
Likes: 2
From: McDonough Georgia
Originally Posted by Big Fish
Correct me if I'm wrong, but I thought our smog motors were supposed to run a little rich so the un-burned fuel would burn in the catalytic converter and cause it to heat up and operate more efficiently.
Instructor
Joined: Jul 2000
Posts: 173
Likes: 0
From: Pumpkin Center CA
Originally Posted by bextreme1
I don't know where you live but I don't think there is any state, maybe CA, where a 31 year old car needs emissions testing. I'm in NY and here, I think if a car is 25 yrs. old it's automatically exempt. Every year I need just a safety inspection. Check on your states DMV site.
Just be warned, the Federal (read all states) laws clearly specify that if a car is manufactred with smog equipment it cannot LEGALLY be removed or made inoperable. Correctly stated above that most states do exempt older vehicles (Age Varies) from annual/semi-annual TESTING/INSPECTION ONLY. If caught with modified smog equipment, irregardless of age, car can be impounded and registration revoked until smog equipment is returned to original factory spec's.
Now, do a lot of owners do it anyway, SURE DO!!!
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Originally Posted by bextreme1
I don't know where you live but I don't think there is any state, maybe CA, where a 31 year old car needs emissions testing. I'm in NY and here, I think if a car is 25 yrs. old it's automatically exempt. Every year I need just a safety inspection. Check on your states DMV site.
(...where were you when I asked this question 4 months ago)
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
Yes, my converter has been removed and replaced with a thru pipe that mounts directly to the cat mounts that were there. I think you can get it from Corvette America. I had the engine rebuilt at the same time I did the exhaust and now have a 350/350HP which sounds great.
Also, I can't remember ever being stopped by the FBI to see if I had correct exhaust. States are the ones that rule emissions on the local level and if it is exempt by the state I don't think it's a problem.
Also, I can't remember ever being stopped by the FBI to see if I had correct exhaust. States are the ones that rule emissions on the local level and if it is exempt by the state I don't think it's a problem.
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Originally Posted by bextreme1
Yes, my converter has been removed and replaced with a thru pipe that mounts directly to the cat mounts that were there. I think you can get it from Corvette America. I had the engine rebuilt at the same time I did the exhaust and now have a 350/350HP which sounds great.
Also, I can't remember ever being stopped by the FBI to see if I had correct exhaust. States are the ones that rule emissions on the local level and if it is exempt by the state I don't think it's a problem.
Also, I can't remember ever being stopped by the FBI to see if I had correct exhaust. States are the ones that rule emissions on the local level and if it is exempt by the state I don't think it's a problem.
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
Yes. I've had my car thru inspection twice. In NY you would only need a Safety Inspection.i.e. lights, brakes etc.
As far as replacing the cat, you need to take everything off but leave the flanges that are used to connect the cat. The replacement part has the flanges that match the originals. All you do is bolt the new pipe to the flanges and you're done. You can cut the bolts off with a hack saw or a torch. Either way don't mess up the flanges.
Bill
As far as replacing the cat, you need to take everything off but leave the flanges that are used to connect the cat. The replacement part has the flanges that match the originals. All you do is bolt the new pipe to the flanges and you're done. You can cut the bolts off with a hack saw or a torch. Either way don't mess up the flanges.
Bill