US EPA

914897 

Journal Article 

The use of pure methanol as fuel at high compression ratio in a single cylinder gasoline engine 

Çelik, MB; Özdalyan, B; Alkan, F 

2011 

1 

Fuel
ISSN: 0016-2361
EISSN: 1873-7153 

Elsevier BV 

90 

4 

1591-1598 

10.1016/j.fuel.2010.10.035 

WOS:000287652300034 

http://linkinghub.elsevier.com/retrieve/pii/S0016236110005752
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The methanol has greater resistance to knock and it emits lower emissions than neat gasoline. As single cylinder small engines have low compression ratio (CR), and they run with slightly rich mixture, their power are low and emission values are high. The performance can be increased at high CR if these engines are run with fuels which have high octane number. In this study, methanol was used at high CR to increase performance and decrease emissions of a single-cylinder engine. Initially, the engine whose CR was 6/1 was tested with gasoline and methanol at full load and various speeds. Then, the CR was raised from 6/1 to 8/1and 10/1, gradually. The knock was not observed at the CRs of 8/1 and 10/1 when using methanol while the knock was observed at the CR of 8/1 when using gasoline. The knock was determined from the cylinder pressure-time curves. The results showed that some decreases were obtained in CO, CO sub(2 and NO) sub(x) emissions without any noticeable power loss when using methanol at the CR of 6/1. By increasing the CR from 6/1 to 10/1 with methanol, the engine power and brake thermal efficiency increased by up to 14% and 36%, respectively. Moreover, CO, CO sub(2 and NO) sub(x) emissions were reduced by about 37%, 30% and 22%, respectively. 

Methanol; Small spark ignition engine; Performance; Emission; Compression ratio