The effect of carburetor refurbishing on emissions, performance, and fuel economy in a classic pickup tested using real-world tests

This project investigated how refurbishing the carburetor of a 1952 Chevrolet Pickup would affect emissions, performance, and fuel economy. The test used were real-world tests that anyone, with or without access to a laboratory, can perform. The design of the real-world tests is important for ascertaining good results. Thought should go into how to perform the tests safely while still eliminating as many variables as possible. The emissions at idle improved by reducing the carbon monoxide percentage from 4-6% to 2- 3%. The hydrocarbon levels were reduced from 800-1000 ppm to 500-600 ppm. The results of the emissions test were unclear at cruise. The performance data showed that the vehicle had a slower acceleration after the refurbishing. The time to go from stopped to 100 feet in first gear was 5.46 s before refurbishing, and 6.48 s after refurbishing. It is possible that the vehicle was running lean at wide-open throttle after refurbishing. The fuel economy improved with the refurbished carburetor. The initial fuel economy was 10.7 mpg and the final fuel economy was 15.2 mpg. Once the results from the tests are collected, they need to be scrutinized to see if they are plausible using empirical data. Even with extreme care it is difficult to get precise measurements using real-world tests. The emissions data at cruise was not consistent with idle and could not be used. The fuel economy tests and emissions tests at idle show that the engine was running less fuel rich after refurbishing.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Holmes, Jacklyn (Jacklyn A.)

Advisor dc:contributor.advisor

• John B. Heywood.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/69179

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/69179