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Tinkering with timing

Question : REGARDING the use of Octane 95 petrol in the future, can I retard the ignition timing by one or two degrees at a time if 'pinking' occurs during operation. Is this the right procedure to eliminate 'pinking'? Please advise.

Answer : The octane rating of the fuel is simply its ability to resist knock and if your owner's manual recommends that you use a fuel with an octane rating of less than 95, then there is no need to make any adjustments. The issue arises only when the recommendation is for a higher rating, when slight adjustments have to be made to the ignition timing. For an engine with an electronic management system, this task is taken over by the 'knock sensor', which adjusts the ignition timing continuously to the optimum level. Your method can be used for manually adjusted ignition timing. Please note that adjusting the ignition to the point just before 'knock' does not necessarily mean that it is the best setting for the engine performance.

 
 

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