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John B. Heywood. Holmes, Jacklyn (Jacklyn A.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2012-02-24T15:29:42Z 2012-02-24T15:29:42Z 2010 2010 http://hdl.handle.net/1721.1/69179 676809587 Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (p. 28). 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. by Jacklyn Holmes. S.B. 35 p. eng Massachusetts Institute of Technology 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. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. The effect of carburetor refurbishing on emissions, performance, and fuel economy in a classic pickup tested using real-world tests Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="70d47319-e56a-4a03-a60f-1feac9eda95d"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>The effect of carburetor refurbishing on emissions, performance, and fuel economy in a classic pickup tested using real-world tests</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2010</PublicationDate> <Authors> <Author> <DisplayName>Holmes, Jacklyn (Jacklyn A.)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>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.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>