Carb tuning help...please
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Teching In
Joined: Feb 2007
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Carb tuning help...please So a few months back i traded a guy my 02 Z for a 70 chevelle 350, car has a brand new motor, carb, etc as of about a few thousand miles ago. So it needed to get smogged before i could get it registered again and it didnt pass, these were the numbers:
Hydrocarbons in PPM idle standard 450/ idle reading 514
carbon monoxide in% loaded standard 3.75 loaded reading 5.69
The guy sai my car is running to rich which i new when i got that car is was just by the smell so...... how do i tune a 650 edelbrock to lean the **** out of it? thanks!
Hydrocarbons in PPM idle standard 450/ idle reading 514
carbon monoxide in% loaded standard 3.75 loaded reading 5.69
The guy sai my car is running to rich which i new when i got that car is was just by the smell so...... how do i tune a 650 edelbrock to lean the **** out of it? thanks!
Edelbrock carbs are super easy to tune and work just fine IMO. You need to download edelbrock's tuning manual off the internet, it'll tell you everything you need to do. You'll need a calibration kit for your model carb. Most likely you'll just slap the next size bigger metering rods in to lean it out, will take all of 3 minutes to do. If you can't find that online manual, give me a shout & I'll find my link to it.
I've fucked w/ just about any type/brand of carb there is and Holley is far the best that I can find... Just my personal preferance, but do what ever you like. Rejet your Edelbrock (If you running a 72/68 or 65 set up go to the 70/62 or 60, that will lean you out some
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Find someone that has a wideband O2 kit to aid in tuning if you can.
If not, you can hook up a narrow band O2 sensor to at least dial in the idle/light throttle.
Do some google searching for a simple O2 sensor setup that can be monitored with a common digital multimeter.
You can get a much better tune with any carb if you can tell exactly how any of your
tuning changes are affecting the exhaust readings.
If not, you can hook up a narrow band O2 sensor to at least dial in the idle/light throttle.
Do some google searching for a simple O2 sensor setup that can be monitored with a common digital multimeter.
You can get a much better tune with any carb if you can tell exactly how any of your
tuning changes are affecting the exhaust readings.
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Look at any carbureted car that makes serious power...You won't find an Edelbrock/Carter AFB/Quadrajunk there. You'll find something based off the Holley double pumper's design.
Last edited by b00sted; Jan 1, 2008 at 04:42 PM.
strictly to pass emissions, and depending on the outcome of tuning the carb and observing spark plug color, you might want to try one heat range hotter spark plug. That can help at idle and under normal load. When passed, you can go back to a safer setup. I'm guessing the oringnall tune on it was 160F thermostat and cold spark plugs too, try sticking a 180F or 190F thermostat in it for the emissions test making sure the car has been running a good 30 minutes and is nice and hot. Not sure if adjusting timing a little will help with CO or NOx, I thought I remember hearing something about that, might be worth researching. Who know's, you might be the only one ever at an emissions' station with the hood up adjusting timing like you were on a chasis dyno 
As stated a couple times, nothing wrong with the Edelbrocks. They're not Holleys but that doesnt mean they dont work ok, or are less tuneable.
The jets and rods are easy enough to change, and yes, probably easier than a holley. You dont even have to drain the bowls to change them.
The only bad part about them is you have to buy a whole tuning kit for them, as opposed to individual parts.
The metering rods and springs act as the power valve does in a Holley. The only difference being that at idle, or slightly off idle, the metering rod is in the jet, so changing to a larger metering rod can lean it out some at part throttle.
The jets and rods are easy enough to change, and yes, probably easier than a holley. You dont even have to drain the bowls to change them.
The only bad part about them is you have to buy a whole tuning kit for them, as opposed to individual parts.
The metering rods and springs act as the power valve does in a Holley. The only difference being that at idle, or slightly off idle, the metering rod is in the jet, so changing to a larger metering rod can lean it out some at part throttle.
Teching In
Joined: Aug 2007
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From: Elmendorf AFB, AK
HA! I will agree on the Carter and Quadrajunk, but not the Edelbrock! Its all preference, but by far the 2 best are Holly and Edelbrock. If you tune your Edelbrock in, you can make awesome power! Its not all in the carb either! Its in the cam, heads, valves, intake, and so on. You can make huge power with either carb. You also need to make sure you get your cfm correct for your motor too. So many variables. Anyways, lol so much said for just saying I like Edelbrock lol. I dont mind Holly either! Teching In
Joined: Aug 2007
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From: Elmendorf AFB, AK
