RE: Gas

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RE: Gas - 5/20/2008 8:15:53 AM

KAZSAM

Posts: 647
Joined: 2/14/2008
Status: offline

I have to agree with rianbech if your motor does not knock with 87 why put in 93. It is all advertisement. Just like BMW wants you to spend $9.50 a quart for thier special oil when mobil one or
castrol will protect just as well. Profit is the name of the game.

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KAZSAM

(in reply to Igloo112)

Post #: 11

RE: Gas - 5/20/2008 5:45:19 PM

rianbechtold

Posts: 25
Joined: 5/19/2008
Status: offline

quote:

ORIGINAL: Igloo112

^^^^ Burns slower....? Hmmm, so are you saying that 93 would last longer than 87?

In fact it does last longer. In the combustion chamber that is! It will still inject the same amount so a tank of gas won't last longer.

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19 Year old budget mechanic!
I'd rather be working on my Chevelle!

(in reply to Igloo112)

Post #: 12

RE: Gas - 5/21/2008 12:04:15 AM

bmw745ion19s

Posts: 590
Joined: 7/31/2007
Status: offline

i only use 93 in my car, where i bought the car in Texas and coming back they had 91, and 92 octane as the highest levels avail at some stations. Even with that I noticed a performance and fuel economy diff. in favor of the 93 octane. My car has never had gas that contains ethenol in it either. Lately, ive had to turn around and leave many stations I normally go to but I refuse to put it in any of my cars.

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2003 S-Type R W/ Navigation
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(in reply to rianbechtold)

Post #: 13

RE: Gas - 5/21/2008 11:52:27 AM

cosworth

Posts: 167
Joined: 10/19/2007
Status: offline

I come from turbo cars where octane is so debated and capitalized upon. I personally like is a mild to cold climate (west coast) and use 89 in the winter. In the summer/spring/fall I use 92.

I use Chevron exclusively.

Remember Chevron higher octane gas is still the same gas at lower octane gas but with additives that make it burn slower. Very little difference in quality.

Bob's corner gas bar? Who knows where he buys his gas from. Chevron ONLY put Chevron in their tanks (in Canada at least) and you know what you are buying.

this is debated ad infinitum on line especially amongst motorcyclists and turbo owners. buy what you want. Spending money on expensive gas over the lifetime of a car or buying synthetic oil equates to a full engine replacement for some cars (price point varies).

Drive your car better (and maintain it) and cheap gas is the smallest variable. Filling your tank after the drive and parking it full in colder temps is THE BEST insurance against any fuel issue. Less chance for condensation on the tank.

(in reply to Igloo112)

Post #: 14

RE: Gas - 5/21/2008 12:18:57 PM

rianbechtold

Posts: 25
Joined: 5/19/2008
Status: offline

Added ethanol will cause a loss of mileage and marginal loss of performance. HOWEVER, living in California I have had to deal with added ethanol (every station has to add it here). After 2 engine builds, I support it. The first 350 I built ran it's entire- 85,000 mile- life on ethanol added gas before I replaced it with my current motor(nothing wrong with it when removed). I tore it down for a rebuild to sell it and was amazed by the condition. The valves, exhaust ports, quench area, and combustion chambers looked brand new! Plus ethanol is even more slower burning than gas, raising the effective octane rating. This lets you raise the compression ration and run on pump gas. My new motor has a static compression ratio of 12.2:1 I wanted to run it on pump gas from the beginning of the build and thought I'd have to go with a custom cam to lower the DCR. However, with the added ethanol fuel, i dynoed and broke the motor in with no problems.

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19 Year old budget mechanic!
I'd rather be working on my Chevelle!

(in reply to bmw745ion19s)

Post #: 15

RE: Gas - 7/3/2008 5:16:29 PM

lowell216

Posts: 26
Joined: 7/29/2007
Status: offline

This debate always drives me nuts. Why would you use a lower rated octane gas for an engine not designed for it. Just because you can''t physically hear engine knock doesn''t mean detonation still isn''t occurring. You can''t tell unless you hook a monitor up to your car and check for it. All your timing tables are designed for higher octane gas. Yes, your knock sensors will compensate to some extent for crappy gas, but why make them. Also, higher octane gas goes not give your car more horse power. More octane makes the gas less combustible and and resistant to detonation allowing you run run a more aggressive timing table (which does allow for more horsepower if properly tuned). All-in-all, the higher octane gas make your engine run better.

For engines designed for lower octane gas then you''re right...the higher octane is generally unnecessary and a waste of money. For engines like ours, you''re just wrong. Spend the extra $5 per fill, take it easy on your engine and use what it''s designed for...

Remember, if you can actually hear the knock then it''s pretty bad...

(in reply to rianbechtold)

Post #: 16