06-01-2010, 04:27 PM | #57 |
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Wiki bad for sourcing. Remember you college kids, if you cite Wiki, be prepared for points knocked off! When anyone can edit it, anyone can edit it! Including me, and I have no idea what octane means!
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06-01-2010, 05:35 PM | #58 | ||
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Quote:
http://www.state.mn.us/mn/externalDo...ctaneFacts.pdf http://chemistry.about.com/cs/howthi.../aa070401a.htm http://news.carjunky.com/gasoline-oc...k-abc502.shtml http://auto.howstuffworks.com/fuel-e...question90.htm Just a few of the other resources if you just want to search a little. And this is from the federal trade commission. Quote:
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06-01-2010, 06:22 PM | #59 |
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manual says 87 octane or higher. That's what I'm doin...just tend to go a bit higher, thats all.
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06-02-2010, 05:44 AM | #60 | |||||
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Which octane gas to use.
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The camaro V-6 engine has 11:1 compression. I'm sure it will run better and get better gas milage with 91-93 octane,. My 99 mazda uses 87, but if I put in 93 I notice the difference in mileage and power, But if I divide the extra cost of the 93 into the mileage in might not be cheaper in the long run. In most cases if you use higher octane pump gas your car will run better and your mileage will increase. In theory using too high of an octane will result in all the negatives that the others said but I've never seen it from pump gas, race gas at the might (probably) do those things the others mentioned. There is a very clear difference between where you buy your gas and what brand you buy. Go buy some unbranded 91-93 gas,then go buy some Sunoco 91-93 gas, and you will feel the difference. The computers pick up the knocks (gas that burns too fast) and turns back the timing. This all lowers your power. So I'd say run the gas that the computer turns back the timing the least if you want the most power from your car. If you can't afford it then just run 87 because it will probably cost you less. The camaro can run whatever you put in it from 87-93 because the computer will adjust to that gas. Here is what the camaro manual says (below). It refers to both the v-6 and v-8, but all the principles apply to both engines in my opinion. The v-6 has 11:1 compression. There is no way you could run 11:1 compression in the old days before computers without high octance gas. -----------------------CAMARO MANUAL-------------------------- ------------------------- Recommended Fuel
If the vehicle has the 3.6L V6 engine(VIN Code V), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, you might notice an audible knocking noise when you drive, commonly referred to as spark knock. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, the engine needs service. If the vehicle has the 6.2L V8 engine (VIN Code W) or the 6.2L V8 engine (VIN Code J), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. You can also use, regular unleaded gasoline rated at 87 octane or higher, but the vehicle’s acceleration could be slightly reduced, and you might notice a slight audible knocking noise, commonly referred to as a spark knock. If the octane is less than 87, you might notice a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, the engine needs service.
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06-02-2010, 08:27 AM | #61 |
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06-02-2010, 12:02 PM | #62 |
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I'm using an OBD2 that lets me read all the parameters
THERE IS A DIFFERENCE. My car is running better. I can tell a difference. My adv degree timing was almost at 32 now it is at 8
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06-02-2010, 12:21 PM | #63 | |
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Quote:
This is a bit misleading.... Octane doesn't matter with diesel. the main component diesel uses to resist combustion is Cetane. Static compression ratios are completely different for these types of engines. gasoline engines are typically 8-10 (although we're seeing production engines hitting 12's sometimes now) and diesels are more into the 40's. Octane and Cetane levels represent the fuels resistance to combustion under compression. The higher numbers will resist it longer so you can squish it more and get more "work" out of it. The reason the v6 recommends 87 and the v8 recommends 91+ is most likely the Dynamic Compression ratio. Which has everything to do with your cam/valve/timing setup. I'm willing to bet the v6's dynamic ratio is much lower than the v8's. (I don't actually know the numbers) Static ratio is a good rule of thumb to gauge where you should start with octane, but dynamic ratio is the more realistic number and will really determine what your engine is happy running with. edit* I didn't finish reading the thread before I posted this... lots of good info here already that I repeated
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06-02-2010, 12:26 PM | #64 |
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I don't have a Dashawk (yet) but I switched from 87 to 89 and the difference is noticeable. Smoother acceleration, especially when you mash it.
Haven't tried the 91. Haven't seen any evidence of additional benefit. Maybe I'll try it sometime. |
06-02-2010, 01:41 PM | #65 |
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I'm confused! It appears that the timing is being "retarded" with the use of higher octane. If it was 32 with low octane and now 8 with higher octane, how can you have better performance. I presume you mean 32 and 8 BTDC.
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06-02-2010, 01:57 PM | #66 |
Actually wiki is a great place to start. People cite their sources at the bottom. You use those sources to get information, not directly off wiki. You really shouldn't hate one something that is a great resource for sources.
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06-02-2010, 02:24 PM | #67 |
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[QUOTE=wylde1;1936123]This is a bit misleading.... Octane doesn't matter with diesel. the main component diesel uses to resist combustion is Cetane.
I think the thread at that point in time refered to the energy per unit of volume. BTU's of lower octane versus higher octane gasoline. |
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