![]() ![]() With older engine designs (and this is a general statement, not Carry specific), they were often just "detuned" to permit operation on less expensive low octane fuel, especially in the case of economy or utility vehicles (and the Carry is both), this would have been done by lowering the compression ratio & retarding the ignition timing. ![]() OK - this is where starts to get complex.ĭepending on the vehicle and the market it was built for, there will be differences in the specification - early models of the Carry/Every did not have knock sensors, later ones do - the importance of this is that it affects how the engine reacts to the different octane ratings.
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