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Using low octane in a turbo - Can anyone direct me to an actual explanation of what happens when a knock is sensed?

posted by  james_a_sousa on  Sat Oct 19 20:24 CST 2013
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last visit: Thu Oct 23 18:51 CST 2014
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Many people - including Consumer Reports tell one to use regular fuel to save money.

The will not, however answer my question as to how a car compensates for low octane.

I have read that the first action by the computer in a Volvo is to add extra fuel to cool the cylinders to stop the knock.

You see, if the engine is knocking, the cylinder(s) are firing before the ignition system operates, retarding the ignition will not stop the knock.

Can anyone direct me to a good technical explanation of how this system works?

At today's prices, 10 cents more a gallon is worth it to pick up 1/2 an MPG.






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New Using low octane in a turbo - Can anyone direct me to an actual explanation of what happens when a knock is sensed?
posted by  james_a_sousa subscriber  on Sat Oct 19 20:24 CST 2013 >


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