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05.05.2021 9:44:02
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Each carburetor is inspected and assembled by one technician. Before any work can begin, the unit being rebuilt gets a thorough cleaning and inspection to ensure all parts are usable.
In the grand scheme of things, it wasn’t very long ago when every enthusiast-based car magazine was touting the benefits of the then-new EFI systems geared toward the home DIY-er. Back then, some hot rodders speculated the introduction of this new technology for use on classic cars would bring about the demise of the carburetor. I don’t know about you, but I am still waiting on confirmation of the carburetor’s extinction. One company that is proving the carburetor – especially the Quadrajet – is still viable, is Jet Performance.
When it comes to Chevrolet’s vacuum-operated fuel squirters, there are two distinct camps: Those that praise the Rochester Quadrajet, and those that loath it. Whatever your perception, there is no denying that to Chevrolet enthusiasts, the Q-jet is the least understood carburetor placed on muscle cars and trucks.
Install a carburetor kit. Carburetor kits are prepackaged parts kits containing valves, gaskets and any other parts particular to that carburetor model that can wear or deteriorate. Installing a carburetor kit overhauls the carburetor. here
Find and measure the jets, the openings where fuel is forced under pressure into the mixing chamber. Because ethanol contains less energy than gasoline the amount of the fuel introduced to the engine must be increased. Measure the opening, which will be small, very accurately. Use a micrometer, if available, or take the jets to a machine shop for measurement. [links]
Acquire a spare carburetor. Converting a second carburetor to ethanol has a couple advantages. It keeps the vehicle in service while the work is being done and gives the car owner the ability to revert back to gasoline, by re-installing the original carburetor, if necessary. Check salvage yards for a used carburetor. more
Ethanol, a form of alcohol, is a renewable fuel, produced from plant materials that can be grown each year. Ethanol is not interchangeable with gasoline. Vehicles intended to run on ethanol will require several modifications to the fuel delivery system including the carburetor. These changes are necessitated by the lower energy content of ethanol and its corrosive properties. These modifications can be accomplished by a competent amateur mechanic. Commercially available kits can make the process easier.
Increase the size of the jets by 40 percent. Calculate the new size based on the measurements of the original jets. Determine the proper size of drill bit and use it to enlarge the jet. Home mechanics without access to a full set of drill bits and a drill press can have this work done at a machine shop. Another option is to purchase new jets of the appropriate size, if available, from an auto parts retailer.
ordering process was great, appreciate the professional advice in making choosing which way to go. Finished product looks great and was well packed. Due to cold weather here in Indiana, I have not been able to get the carb installed so I can't provide an evaluation of performance at this time.
Additional parts and services may be required at extra cost. These would include more
Posted by Terry Saylor on Aug 19th 2021 here
Auxiliary pull off, vacuum brakes (Primary is included) here
secondary air valve cam and tension spring with new air valve screws
My carb was kind of an oddity but they made it work very well. [links]