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Mikes94Dakota
Dodge Dakota
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7/20/2003
01:38:31

Subject: Octane Rating?
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Does the 93 octane run better than 89 and alot better than 85 or what....what is the best fuel to run with for my 94 3.9 auto dak?



nate
Dodge Dakota
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7/20/2003
12:10:48

RE: Octane Rating?
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octane is an petroleum based additive that burns slower than gasoline. Adding it to gasoline makes it, when in a fuel/air mix, less explosive. In high rpm, high compression engines, this is important. It keeps the fuel/air mix from combusting due to compression, before the sparkplug fires (detonation).

In an engine like yours, running higher octane than necassary may give you better performance in the 4k rpm and up range, but in day to day driving - It will DECREASE your mpg. Americans waste alot of money paying for gas that is rated higher than what their vehicles require, then in turn waste millions of gallons of gas when their car's mpg goes down slightly as a result.

Look in your manual. If it says 87, run 87. Whatever is listed in your manual is the best gas you can run (mpg wise) without worrying about detonation. Why? its determined by the EPA in conjunction with the car manufacturers.



gg
Dodge Dakota
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7/20/2003
13:41:30

RE: Octane Rating?
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here in az all you can get at the pump is 91,my v6 runs cleaner with 91 ,plugs looked like crap running 87,by good gas ,i run texico,mobil,chevron and exxon is good stuff,wish we had sunoco round here



Mikes94Dakota
Dodge Dakota
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7/20/2003
21:34:32

RE: Octane Rating?
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Ok if all is in all.....what about the
Knock Sensor?



mo-par
Dodge Dakota
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7/20/2003
21:39:11

RE: Octane Rating?
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the 4.7 is the only Dakota engine that has a knock sensor



Mikes94Dakota
Dodge Dakota
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7/20/2003
22:06:19

RE: Octane Rating?
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Well.....maybe....but ill run a scan check on it
to see if it really does...which i think it
does.....even my old 84' 600 2.2 turbo had a
knock sensor on it.....factory!



repeat
Dodge Dakota
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7/20/2003
22:12:31

RE: Octane Rating?
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the 3.7 & 4.7 & the 5.7 HEMI are the only mopars that have knock sensors



Mikes94Dakota
Dodge Dakota
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7/20/2003
22:16:51

RE: Octane Rating?
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U mean trucks right of this decade cause
like i said my old 84 had one. \
I'll tell you when i get my truck back from the
paint shop and see if it does or not



Mikes94Dakota
Dodge Dakota
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7/20/2003
22:18:28

RE: Octane Rating?
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What cars or trucks have a 3.7. I have never
seen or heard about such a chrysler motor
before



Marks67Ram
Dodge Dakota
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7/20/2003
23:23:29

RE: Octane Rating?
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this is for repeat they did hav a knock sensor
on the 600 and the 3.9 v6 daks no matter if it
was a 600es it still had one even though the
only ones u hav seen wer 3.7,4.7,5.7 dosnt
meen they were the only ones w/ knock
sensors you dont know evrythng no body
does but dont put meseges if your not sure



blu4door
Dodge Dakota
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7/21/2003
00:04:01

RE: Octane Rating?
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3.7 = Jeep Liberty.



bowser
Dodge Dakota
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7/21/2003
13:27:05

RE: Octane Rating?
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3.7=Next motor for Dak=crap



AmsoilSponsor
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7/21/2003
14:40:57

Amsoil Series 2000 Octane Boost
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I am not a qualified expert. My Bro-In-Law owns a couple of gasoline stations, and I have read some articles. Here is what I know and correct me if you must.
--------------------------------------------------
Itís been my observation that if an engine does not require high-octane fuel, it will run cleaner and better on the fuel it was designed for.

Octane rating is a measure of the fuel's resistance to pre-ignition. High-octane is specified by manufacturers when the engine requires it. High compression, high temps, or turbo engines will do better with high octane due to its slower burn rate.

Basically, the numbers you see at the pumps only indicate the anti-knock index of the fuel. It is measured using RON + MON and the divided by 2 (R+M)/2. In short, RON (Research Octane Number) measures the fuel's anti-knock index simulating light load, typical street, normal driving conditions. MON (Motor Octane Number) measures the fuel's anti-knock index simulating high-speed, high load conditions.

They used to post the RON and MON octane numbers in small print on the Sunoco pumps but I haven't noticed this lately.

Run what your owners mauual specifies. Put the high-octane in an engine designed for 87 and you have incomplete combustion ... and a waste of 20 cents per gallon.
--------------------------------------------------
Consider AMSOIL Series 2000 OCTANE BOOST for the track events !!

IMHO ... Not to be used as a daily fuel additive. Use only for qualifying runs and the actual racing event.
--------------------------------------------------



Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com

AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products



blueballs
Dodge Dakota
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7/21/2003
17:37:35

RE: Octane Rating?
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Here is a fuc-k up thought.. Try them and see. Run two tanks of each. This will let the truck adjust.



alexB
Dodge Dakota
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8/08/2003
20:45:27

RE: Octane Rating?
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Here is a TSB from DC that explains the octane issue that applies to all cars:


Engine - High Driveability Index Fuels


NO: 14-08-97

GROUP: Fuel

DATE: Nov. 21, 1997

SUBJECT:
Poor Driveability With High DI (Driveability Index) Fuel

MODELS:

1996 - 1998 (AB) Ram Van/Wagon
1996 - 1998 (AN) Dakota

1996 - 1998 (BR/BE) Ram Truck
1998 (DN) Durango
1996 - 1998 (FJ) Sebring/Avenger/Talon
1996 - 1998 (JA) Cirrus/Stratus/Breeze
1996 - 1998 (JX) Sebring Convertible
1996 - 1998 (LH) Concorde/Intrepid/LHS/New Yorker/Vision
1996 - 1998 (NS) Town & Country/Caravan/Voyager
1996 - 1998 (PL) Neon
1997 (PR) Prowler
1996 - 1998 (SR) Viper Roadster/Coupe
1997 - 1998 (TJ) Wrangler
1996 - 1998 (XJ) Cherokee
1995 - 1998 (ZJ) Grand Cherokee

SYMPTOM/CONDITION:

Long cold start times, warm-up sags, hesitations, and driveway die outs. These symptoms are most noticeable and severe at moderate ambient temperatures between 4 - 27 degrees C (40 - 80 degrees F).

DISCUSSION:

Gasoline with a high Driveability Index (DI) can cause the above described symptoms. DI is a measure of the gasolines total volatility, or tendency to vaporize completely. A high DI number is less volatile than a low DI number. Most premium gasoline sold in the U.S. has a higher (worse) DI index than regular or mid-grade gasoline. Use of premium gasoline is NOT recommended for vehicles designed to run on 87 (R+M)/2 regular or 89 (R+M)/2 midgrade gasoline. High DI gasolines also cause higher emissions for the same reasons they cause driveability problems.

For vehicles that require an octane rating of 91 (R+M)/2, premium is recommended, or possibly required. Using premium fuel with a higher than recommended octane rating is not recommended. Owners who experience fuel related cold start and warm up driveability problems should try a gasoline with the recommended octane rating or different brands of gasoline until they find one that provides good performance.

The octane quality of gasoline is only a measure of its resistance to spark knock. The use of higher than recommended octane gasoline under normal operating conditions does NOT improve startability, idle quality, fuel economy, driveability, acceleration, engine durability, or emissions. In fact, most higher octane gasolines available in the U.S. have higher DI values than regular gasoline. Customers are most likely to experience poor driveability with premium gasoline than with regular.

Some vehicles, such as Viper, Prowler, 5.9L Grand Cherokee, 2.0L Turbo Talon, and 2.0L DOHC Neon have been specifically designed to take advantage of higher octane. These vehicles may have higher compression ratios, and/or more aggressive spark calibrations which provide optimum performance with the specified higher octane. However, other vehicles which are not specifically designed and calibrated to take advantage of higher octane will not benefit from higher octane.

Some vehicles may experience light spark knock in situations such as trailer towing or climbing steep sustained grades. Light knock or "ping" under these conditions is not harmful. However, if the customer is concerned about light knock under these circumstances, the use of 89 (R+M)/2 or even 91 (R+M)/2 premium gasoline may be temporarily warranted. If a vehicle is experiencing heavy spark knock on gasoline with its designed octane rating, this may be an indication of excessive combustion chamber deposits, or some other problem. Combustion chamber deposits can be removed with Mopar Combustion Chamber Conditioner p/n 04318001. Standard diagnostic procedures may help in identifying other potential causes of excessive knock.

Some gasoline marketers may advertise that their premium gasoline contains extra detergent additives. Under provisions of the Clean Air Act, ALL gasoline sold in the U.S. must contain effective deposit control additives. Nevertheless, if fuel injector or intake valve deposits are suspected of contributing to poor performance, occasional use of Mopar Fuel Injector Clean Up p/n 04549613 is a much less expensive way to maintain engine cleanliness than regular use of premium gasoline.



Demon
Dodge Dakota
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8/09/2003
07:37:10

RE: Octane Rating?
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The higher the compression in your cylinders, the higher octane you need. I use 89 in my 2000 Sport V6, my friend's supercharged Grand Prix will run like sh!t unless he uses 93. As Nate says, using higher than needed is a waste and can cause long term engine problems.



TellMeWhy
Dodge Dakota
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8/16/2003
19:24:22

RE: Octane Rating?
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Okay...
Which brand of gasoline do we prefer...and why?



HeLpMePlEaSe
Dodge Dakota
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8/23/2003
18:46:29

RE: Octane Rating?
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Gas is reaching $2 gallon. Can I use the lowest Octane and save a few bucks every fillup?



Ed
Dodge Dakota
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8/25/2003
10:49:32

RE: Octane Rating?
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Use the recomended, mine is a 2000 and I use 87 all the time. If you can avoid it do not use Canadian gas in your Dakota. I took mine up there and got some bad gas toasted two injectors and caused some problems with the fuel system.

As stated above Octane increases burn times, which in some vehicals depending on the compression ration of the cylinder can cause the deposit of carbon in the engine causing a reduction in engine life and good operation.



Dville Dak
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8/25/2003
11:25:27

RE: Octane Rating?
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I have tried all 3 grades. The middle seems to run best for my 3.9. The high grade made it run funny and it also ran a little hotter (not much.) The low grade just didn't seem give it enough umph. But the middle seems to be just right. Just my 2 cents worth.



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