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Old 07 Feb 2009, 02:01 pm
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Default Would using 93 octane (premium) gasoline in my Civic vtec increase performance? Manual says "87 or..

...higher"? its a 99 civic automatic ex model with soch vtec motor. I did look at the manual and it states that i can use gas "87 octane or higher". Well ive been using 87 since ive owned the car (10 months), would i notice a smoother running car or more power if i filled it up with 93 octane? car has 96,000 miles on it.what does knock mean and how can i tell if its knocking
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Old 07 Feb 2009, 02:46 pm
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Probably not, if the manual says 87 octane then that's all your motor needs, most cars have no need of higher octane fuel unless they have some performance mods.
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Old 07 Feb 2009, 03:01 pm
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If it does not knock running on 87 octane then buying 93 is a waste of money.
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Old 07 Feb 2009, 03:16 pm
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I'm sure some un-educated wanna-be fast-and-the-furious kids will post up and say that it will...but it won't.Higher octane gasoline is more resistant to pre-detonation, which is why it used in high-revving, high compression/boosted engines. But in an engine like your d16z6 civic, you don't need 93 octane...there's not enough compression to warrant it.
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Old 07 Feb 2009, 03:31 pm
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Well for one (prelude) does not no what he is talking about there is no such thing as pre detonation it would either be pre ignition or detonation and his car does not have the d16z6 it has a y8 and you wanna call the other kids fast and the furious get out of here
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Old 07 Feb 2009, 03:46 pm
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Switching to 91 octane will most likely just end up costing you more money. It is possible that after time, carbon buildup in the combustion chamber and on top of the pistons can warrant use of higher octane fuel (since your compression ratio has been increased by the carbon buildup). An engine with as few miles as yours isn't likely to have that amount of buildup.Also, knocking is caused be pre-ignition, and sounds similar to driving over dry leaves.
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