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Joined: Jan 2007
Posts: 24
Grease Monkey
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OP
Grease Monkey
Joined: Jan 2007
Posts: 24 |
Well I'm back again with more questions for you guys.
I've changed the points, condenser, plugs, rotor, and distributor cap. Depending on driving conditions I get anywhere from 7 to 10 mpg. When going down hills it backfire in the exhaust. The carburator that's in it is a carter with a w-1 on it. When I'm looking at kanter auto products this is not one of the numbers they list.
Anybody have any thoughts on the matter.
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
I suspect carburator problems. A visual of your carb will locate the air adjustment near the top of the carb. At the base of the carb will be a fitting that goes to the vacuum advance. This information applies to the OEM carb. A later carb may be used with expected better results, however ANY carb must be rebuilt and checked for the correct components.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
If in good condition the OEM carb should give 15-18 mpg. If it does not then you need to get it fixed by someone who really knows what they are doing. Very few fit that description. Fortunately there are at least three VCCA members who do. A couple of VCCA members who advertise that they rebuild the carbs and apparently do not.
How Sweet the roar of a Chevy four!
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Joined: Jan 2007
Posts: 24
Grease Monkey
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OP
Grease Monkey
Joined: Jan 2007
Posts: 24 |
I appreciate the info you guys are giving me however you both have used the term OEM. I'm assuming this has something to do with original equipment. If so does that mean my carb is not original?
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
OEM = Original Equipment Manufacturer. Your carburetor could be an OEM W1 or it could be a later W1 replacement. Visual inspection will determine which carburetor you have. :)  
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Dec 2002
Posts: 689
Oil Can Mechanic
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Oil Can Mechanic
Joined: Dec 2002
Posts: 689 |
You should search this site for earlier discussion on W-1 identification. There have been numerous posts on how to identify which W-1 is which. Unfortunately, Carter made many W-1's and it is essential that you get the right parts for your carburetor.
Coach
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Visual inspection will determine the carburetor in most cases but it is not 100%. Over the years some of the internal parts can be switched which can only be determined by at least a partial disassembly. The most critical parts are the main jet, metering rod and low speed jet. If those are correct for the application, the float set close to specification and the insides of the carb are clean then the engine should run correctly. Since yours does not then one or more of the above is likely the problem.
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Also look for vacuum leaks causing the back fire on deaccelleration.
Gene Schneider
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Joined: Sep 2004
Posts: 382
Backyard Mechanic
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Backyard Mechanic
Joined: Sep 2004
Posts: 382 |
Popping through the exhaust on deccelleration is most often caused by exhaust leaks, usually the donut gasket between the exhaust manifold and the head pipe, not by anything on the intake side.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Then why did they do it years ago when we removed the wiper hose from its fitting so it would pop back thru the exhaust when backing off?....when a glass pack was used.
Gene Schneider
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Joined: Sep 2004
Posts: 382
Backyard Mechanic
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Backyard Mechanic
Joined: Sep 2004
Posts: 382 |
Gene,
No one had mentioned an exhaust leak as a possible cause of the popping exhaust, and I have found the problem on my 33 has always been the donut exhaust gasket. I guess a vacuum leak would do the same thing by admitting fresh air, ultimately to the exhaust system, mixing with the unburned gasses in the hot muffler.
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