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08-29-2020, 01:58 PM
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#1 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,249
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Sensor for Tune Ups?
I was wondering if any of you folks that run carbs still if there is some sorta )@ type sensor that can be used to adjust the carb setting with? The 4bbl (500 CFM) on my 81 and it is running really rich. I have the kit to tear into the Edelbrock, but it would be nice to know with some sorta gauge to see what is coming out the pipe without having to run it a while, check the plugs and all. I have not down a carb reject/rerod (whatever you call it on an Edelbrock) in 30 years.
Thanks for the help.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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08-29-2020, 04:26 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
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Re: Sensor for Tune Ups?
Running real rich on an eddy is usually too much fuel pressure.
Have you got a regulator set to 5 psi. |
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08-29-2020, 04:34 PM
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#3 |
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State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,249
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Re: Sensor for Tune Ups?
Its the factory fuel pump on my 250, which isn't real hig output..
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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08-29-2020, 06:39 PM
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#4 |
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Just here to tinker
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: Sensor for Tune Ups?
Have you performed the basics? Timing and set idle/mixture with vacuum gauge?
Also, checked to ensure choke is opening all the way after warm up?
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08-29-2020, 06:47 PM
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#5 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,620
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Re: Sensor for Tune Ups?
The normal tuning gauge is an Air Fuel gauge but they require an O2 sensor be mounted in the exhaust system very close to the transition from exhaust manifold to pipe.
Make sure the choke is adjusted properly. As mentioned check for fuel pressure. If you take the carb apart, check for proper float height. The nice thing about the eddy carb is you can change the rods and power piston springs via the little access caps on top. If the carb has been in service for a while, maybe all you need to do is pull the caps and give the pistons and cylinders a good soaking in carb cleaner. They can get gummed up and sticky after a few years. Would also let you check what rods and springs are installed. Depending on what carb you have, possible it was sold as a "Performance" carb and those are usually rich for a daily driver. The manuals came with a calibration chart for making adjustments. You might check which rods you have and order a set that is a bit leaner on the chart. Same for the springs. |
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08-30-2020, 07:37 AM
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#6 |
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State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,249
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Re: Sensor for Tune Ups?
Everything is new. Timing and fuel pressure is good. Choke appears to open all the way. I just can't go lean enough on the carb with the out of the box jetting. I was just curious if there was anything out there like you see the EFI guys use to monitor fuel mixture. I'll probably be getting into opening up carb and rejetting it. This is all on the new tweaked some 250 I put into the truck. It is old style heard, cam, 4bbl Offenhauser intake, the new Edelbrock 500 carb and headers.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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08-30-2020, 12:44 PM
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#7 |
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Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 769
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Re: Sensor for Tune Ups?
This may help: one of the better ones If you still want to stay with Carb
https://www.youtube.com/watch?v=YiUDltHKnLE
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 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bedWas a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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09-01-2020, 12:29 PM
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#8 |
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Registered User
Join Date: Jun 2014
Location: CO
Posts: 750
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Re: Sensor for Tune Ups?
I installed a AEM wideband O2 sensor in my truck and is the best thing I ever did as far as tuning. It helped me pass emissions here in CO. The gauge does become a litte addictive watching it as you driving to see what air/fuel ratio is.
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79 Chevy 2wd BIG10 350 TH400 |
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