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steph
Dodge Dakota
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1/09/2002
17:12:39
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 Subject: Octane,high or low?
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What do you all think about the octane levels we use? I run premium in my Dak faithfully, but I've had people even certified mecanics tell me that running too high an octane level all the time is no good, others still including certified mecanics tell me the opposite. Personally I agree with the pros of higher octane and believe it or not my gas mileage is better with the higher octane not to mention the increase in performance. What do you think and use? Steph.
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Joel
Dodge Dakota
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1/09/2002
17:41:51
|  RE: Octane,high or low?
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If your mods don't require high octane, use what is in the owners manual. That is what the engeneers designed the engine to run on.
Higher octane can hurt, reason is the amount of time it takes for the air fuel mixture to combust while the piston is at top dead center. Too long of an explosion can mess up timing! To low octane (if there is such a thing on your truck) can cause pining and power loss.
Joel
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joel
Dodge Dakota
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1/09/2002
17:44:27
| RE: Octane,high or low?
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also, too high octane can cause power loss.
Joel
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jjj
Dodge Dakota
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1/09/2002
18:12:54
|  RE: Octane,high or low?
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Not sure where joel gets his info, but the only thing higher octane can hurt is your wallet. If your truck performs better and you don't mind spending the cash then it is better for your truck. If you get better fuel eco. then your are probably pinging (even though you may not hear it) with the lower octane. Run what ever the truck and you prefer. I personally use reg. (I am cheap) and switch brands often.
Jeff
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Clevite 77
Dodge Dakota
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1/09/2002
21:21:49
| RE: Octane,high or low?
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87 octane burns much better in the winter than say 93 example- hard starts
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steph
Dodge Dakota
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1/11/2002
16:37:43
| RE: Octane,high or low?
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Anyone else?
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MACE
Dodge Dakota
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1/11/2002
17:02:04
| RE: Octane,high or low?
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Higher Octane burns quicker, right? Could that indeed cause various engine problems if your truck is recommended to use 87 and you use 93?
(I know some folks go with the lowest octane till they start to ping, then go up a rating)
FWIW, keep in mind that 87 is minimum octane rating, if could actually be between 88-90 octane
(read the square yellow label on the pumps)
(I have a Jet II chip that calls for 93 octane, I used 93 and 89, without 'feeling' any difference in my 01 4.7)
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steph
Dodge Dakota
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1/11/2002
17:40:35
| RE: Octane,high or low?
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Wrong, higher octane burns slower. I found an interesting info page on octane.Here it is if anyone is interested.
http://crystalbiol.csufresno.edu:8080/projects/9.html
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MACE
Dodge Dakota
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1/11/2002
17:52:04
| RE: Octane,high or low?
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Thanks for the correction steph, I had a 50/50 shot at that...I just remember some guy during our 2pm coffee break at work, explaining how high octane in a low octane engine could cause problems due to the burn time difference between the two grades...I'm running pretty good with 89 and my current mods.
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steph
Dodge Dakota
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1/11/2002
18:27:57
| RE: Octane,high or low?
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I think we would probably all just do just fine with one octane level, probably just another government gimmick to make money. And here I am buying the expensive stuff! Go figure.
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CW
GenIII
1/11/2002
19:41:51
| RE: Octane,high or low?
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Why spend the money on higher octane if it is designed to run on 87. There are no knock sensors to up the timing to take advantage of the higher octane. I am sure there is a TSB on drivability when using high index fuel.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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Joel
Dodge Dakota
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1/11/2002
20:53:27
| RE: Octane,high or low?
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CW, the 4.7 has no knock sensors?!! Dealers amung others say the 4.7 is so great, efficient "this" and "that" but I'm finding its not really what its cracked up to be.
Joel
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jjj
Dodge Dakota
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1/11/2002
21:00:11
| RE: Octane,high or low?
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It is a shame too because the knock sensors worked great and gave some flexability to fuel use. Maybe an EPA thing or cost issue.
Jeff
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CW
GenIII
1/11/2002
21:24:46
| RE: Octane,high or low?
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What is sad is that the 3.7 and 4.7 HO have them and the rest of us are left in the dark. BASTARDS!!
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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CThomp
Dodge Dakota
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1/11/2002
22:00:32
| RE: Octane,high or low?
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I almost always use 87-89. Never noticed any difference. I have heard though that your engine gets used to one type of octane and that you should try to stick with it. Depends on where i'm getting gas though. If i'm not to confident about the gas I get a higher octane.
Guess I better start saving my pennies for that 4.7HO.
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Joel
Dodge Dakota
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1/11/2002
22:53:18
| RE: Octane,high or low?
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What trucks/cars get the 4.7 HO? Is that in the RAM? What do they get, 10 more hp and tq j/k
Joel
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sandman
Dodge Dakota
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1/12/2002
00:01:46
|  RE: Octane,high or low?
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The owners manual in my 2001 says to use 87 regular. It also says that damage to your vechile can occur from running high octane fuels. It is worded in a very ridged manner. I have run regular in the winter and 89 in the summer. I have no plans to go higher then 89.
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CW
GenIII
1/12/2002
10:44:39
| RE: Octane,high or low?
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4.7 HO is only in the jeeps right now.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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Dave Mitchell
Dodge Dakota
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1/12/2002
10:46:25
| RE: Octane,high or low?
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Too high of octane can cause the combustion process to be incomplete, dumping unburned fuel and and high carbon levels into your catalytic converter and may cause problems there. My wife's cousin was using 97 octane AND octane booster ina motorcycle I bought from him. I had to take the top end off the engine to clean it. The carbon looked like black corn flakes on the piston crown and the chamber in the head. These carbon deposits heat up and glow like charcoal and can actually cause your engine to start "pinging" and dieseling.
It would be advisable to use the recommended grade for a good, clean combustion that won't load up the components with carbon deposits.
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