LP-GAS OCTAN NUMBERS AND THEIR RELATIONSHIP TO ENGINE PERFORMANCE
590269
01/01/1959
- Event
- Content
- An investigation has been made of the relationship between LP-Gas characteristics and the knock-limited performance of several bus and truck engines over a range of design and operating conditions. This work has shown that:
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A.
The knock-limited spark advance characteristics of LP-Gas blends in the engines tested could be rationalized in terms of the Research and Motor octane numbers calculated and determined for the blends.
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B.
The three most severe truck engines investigated in this program have an LP-Gas antiknock requirement of 90.5 octane number at a point called Severity “E”. A nomograph has been developed which can be used to define Severity “E” and can also be used to test an LP-Gas blend of known composition for its suitability in meeting this octane requirement.
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C.
Sufficient data were obtained in this program to demonstrate that if carburetor air or mixture temperatures are not controlled to reasonable limits, satisfactory knock-free operation will not be experienced in all heavy duty engines with pure propane.
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D.
The unique knock limited characteristics of LP-Gas in these heavy duty engines, basically designed for gasoline, suggest that a new approach is required to design mechanical octane numbers for gaseous fuels.
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A.
- Pages
- 18
- Citation
- ARMOR, W., INGERSON, H., HILF, A., JOBARIS, J. et al., "LP-GAS OCTAN NUMBERS AND THEIR RELATIONSHIP TO ENGINE PERFORMANCE," SAE Technical Paper 590269, 1959, https://doi.org/10.4271/590269.