Compression ratio and gas octane
[DOC File]COMBUSTION
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Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause knocking. (Note that it is the absolute compression pressure in the combustion chamber which is important and not the compression ratio. The compression ratio only governs the maximum compression that can be achieved).
[DOC File]Second law analysis of Rankine cycle
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So usually, the compression ratio is between 7 and 10. Figure.8.4. Increase in thermal efficiency with compression ratio. We can, however, go further by choosing the appropriate gasoline with a high octane rating. Octane rating: determines the amount of air-fuel mixture that can be compressed without auto-ignition. So the higher octane rating ...
[DOC File]From: B
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Automotive octane ratings are determined in a special single-cylinder engine with a variable compression ratio (CR 4:1 to 18:1 ) known as a Cooperative Fuels Research (CFR) engine. The cylinder bore is 82.5mm, the stroke is 114.3mm, giving a displacement of 612 cm3.
[DOC File]PHYSICS 103: Test 3
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It uses premium gas. It has a smaller engine. It achieves higher compression ratios since the fuel is injected after compression and spontaneously ignites. Some of the energy is not going into the spark plugs. 30) High compression ratio engines require high octane gas because. Higher octane gas burns at a higher temperature
[DOC File]COMBUSTION
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At the higher compression ratios of modern engines higher temperatures and pressures are attained and dissociation occurs, not only to a greater extent . for NO, but also to some common radicals mainly OH, H, and O, e.g. at 3000(C a stoichiometric mixture of octane and air at equilibrium will contain OH (1.4%), H (0.3%), O (0.3%), and NO (0.3%).
[DOC File]Appendix E - Meeting Notices
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Some higher compression ratio heavy-duty lean burn engines include an additional feedback for knock detection. Higher compression ratio makes an engine more susceptible to knock or detonation. If knock is detected via an accelerometer, the spark plug timing can be retarded, or caused to spark later in the cycle, to reduce knock.5, Retarding the ...
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When using a high octane fuel, in the gasoline autoignition range, in HCCI the required compression ratio is around 18-20:1 and this is much better for fuel efficiency; furthermore such fuels also ...
[DOC File]MidState Miata
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Compression Ratio and Octane. 2001-2015 Miata/MX5 engines have a higher “compression ratio”* than earlier models by design and are recommended to run on 91+ octane gas. (Another Motorhead Geek Alert: Definition: “Compression Ratio”: The compression ratio of an internal combustion engine is a value that represents the ratio of the volume ...
[DOC File]Tech Bulletin - Whitfield Oil
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than other fuels that just concentrated on octane. C12 has been successful in a wide range of applications, including circle track (high and low compression), drag racing, off-road, desert, motocross, snowmobiles, jet skis and road racing. It’s still the best fuel across the widest range of applications of any fuel on the market.
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