Mixing Gasoline
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RE: Mixing Gasoline - 9/26/2005 5:59:43 PM
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Patrick
Posts: 436
Joined: 3/17/2005
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what does your owners manual call for? i would guess 89 octane...the only people whom i have seen run a mix are very high performance cars...in which case they are mixing high octane (100+) with high octane pump gas, because 93 isnt enough for them
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RE: Mixing Gasoline - 9/28/2005 1:18:57 PM
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the_gray_mazda6
Posts: 1874
Joined: 8/13/2005
From: Pittsburgh, PA
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owners manual says 87 octane.... if i were to use a higher octane like 89, would that be better for my engine?
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RE: Mixing Gasoline - 9/28/2005 4:59:45 PM
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Patrick
Posts: 436
Joined: 3/17/2005
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octane rating has to do something with the level of detonation...i have an article about it, but it is about 15,000 words long...
anyways, your car may run a little better with a higher octane..i dont think that it would hurt anything, as your car has knock sensors to prevent things like varying octane...so forth
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RE: Mixing Gasoline - 9/28/2005 6:13:26 PM
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bkey71
Posts: 1469
Joined: 9/9/2005
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It is best to use what the manual calls for. The engine computer is calibrated to run on 87 octane. You can run 89 or 93, but you would be basically wasting money. My mom's VW Passat calls for 91 which must not be available in TX, so she fills up with 89 one time then 93 the other. She waits til it gets about a half tank and alternates on fill ups. And most people think higher octane burns hotter and faster, but it's quite opposite, the higher the octane rating, the slower and more controlled burn in the combustion chamber. That's why pinging tends to be less of a problem in hot weather when you step up a grade in octane.
< Message edited by bkey71 -- 9/28/2005 6:14:24 PM >
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RE: Mixing Gasoline - 9/29/2005 9:34:01 PM
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the_gray_mazda6
Posts: 1874
Joined: 8/13/2005
From: Pittsburgh, PA
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yeah, i mixed 89 octaine with 87 and the pinging sound has been eliminated. My performance feels to be better as well. Especially when accelerating. Would this be a result of the higher octane gas? The ride for whatever reason seems to be smoother.
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RE: Mixing Gasoline - 9/30/2005 6:14:39 PM
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bkey71
Posts: 1469
Joined: 9/9/2005
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Pinging, or also called pre-ignition, is caused by high combustion chamber temps. This is the reason for an EGR valve, it opens to allow exhaust fumes in the engine to cool it and reduce NOX at highway speeds. The higher octane is a slower, more controlled burn, which can lead to better performance in some cars. As far as the ride, dunno. My cousin swears when he washes his car it runs and drives better!
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