Autoignition (cetane / octane number)

Layer 2 — Chemistryin the Combustion Chemistry subtree

Autoignition temperature is fuel + oxidizer + pressure dependent; cetane-number 40+ favors compression-ignition (diesel); octane-number 87-95 resists knock in spark-ignition; primary-reference fuels n-heptane (CN=56) + iso-octane (ON=100).

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