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brewer
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Gasoline...premium or magna?
I have older stuff, like an '89 Cherokee, 3 wheelers, '84 60 hp outboard. And a newer eu3000 generator.
Should I be using premium or magna? I've just got magna in the past. The Cherokee pings while out driving.
So, any thoughts?
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David K
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Magna is 87 octane and Premium is 91-ish... What do use at home? Pemex is not diluted with ethanol, ie. better gasoline!
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woody with a view
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for things where my life depends on it I run Premium..... boats, atv's.... cars run on what the mfgr says they need.
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Pacifico
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I generally get the premium if I'm at a station that has it. If not, I use the magna. My truck runs great on both.
It would be interesting to try the premium in your Cherokee and see if that stops your ping.
"Plan your life as if you are going to live forever. Live your life as if you are going to die tomorrow." - Carlos Fiesta
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Bob and Susan
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ALWAYS use regular...its a marketing gimmick to make more money
people FEEL better if they think they get the BEST for their beloved car or truck
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Pacifico
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| Quote: | Originally posted by Bob and Susan
ALWAYS use regular...its a marketing gimmick to make more money
people FEEL better if they think they get the BEST for their beloved car or truck |
Bob, are you saying there is no premium, that all the gas is the same? Or, there is just no benefit from premium? I would be interested in learning
more about this. Thanks!
[Edited on 5-9-2014 by Pacifico]
"Plan your life as if you are going to live forever. Live your life as if you are going to die tomorrow." - Carlos Fiesta
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woody with a view
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have you ever change the plugs on that jeep? wires, etc....
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Ateo
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| Quote: | Originally posted by Bob and Susan
ALWAYS use regular...its a marketing gimmick to make more money
people FEEL better if they think they get the BEST for their beloved car or truck |
Winning answer. Use what your manufacturer suggests. Most of the time that's 87.
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Ateo
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91 octane does nothing for a car that was engineered for 87 octane. Do a Google search on it and think critically. =)
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rts551
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My 2-stroke motor (Johnson) requires 90 octane or better according to the manual. Ram requires 89 according to the manual. eu2000 takes regular.
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RnR
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| Quote: | Originally posted by brewer
Should I be using premium or magna? I've just got magna in the past. The Cherokee pings while out driving.
So, any thoughts? |
Just try a tank of premium in the Cherokee and see what happens. (Higher octane usually stops pinging)
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willardguy
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| Quote: | Originally posted by Ateo
91 octane does nothing for a car that was engineered for 87 octane. Do a Google search on it and think critically. =) |
funny story about Joshua tree, when gram parsons buddy's stole his body to burn in joshua tree(a pact they had made) they stopped
to fill up a gas can being sure to buy premium, they joked they didn't want him to ping!
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Maderita
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brewer,
Which engine do you have in the Cherokee, the 2.5L or 4.0L?
Both engines were designed to run on 87 octane. However, that doesn't always mean that 87 is sufficient.
There are several problems that may cause your engine to ping with 87 octane.
Carbon buildup, running hot or in hot weather, improper timing, spark plug gap, etc. Does your Cherokee have a recent valve job? Surfacing the head
will increase compression and might require higher octane to compensate.
A tuneup might fix the pinging/detonation problem.
Do NOT continue to drive the vehicle if it is pinging more than momentarily upon sudden hard acceleration. Excessive pinging can cause serious damage
to your engine. Get a tuneup. If that doesn't eliminate the pinging, then switch to a higher octane fuel.
I have had more than one Jeep 4.0L engine that needed 89 octane to run without pinging. My personal tolerance for pinging is zero. A few cents more
per gallon is far cheaper than a complete rebuild.
Bob and Susan,
Please don't believe everything you read in those trite and brief consumer articles. Yes, I've read those too. Passing on that (mis)information as if
you have vast mechanical experience/knowledge is leading folks into trouble. Higher octane fuel is NOT simply a marketing gimmick.
Many vehicles are designed to run on higher octane. The manufacturer will specify the octane requirement.
Heavy demands on an engine, such as steep grades or towing, might call for higher octane than the manufacturer recommended originally. So can hot or
desert conditions. So can the internal condition of an engine or the engine tune. There are numerous variables.
I use what my engine is "happy" (zero pinging) with. If I anticipate pulling grades, towing, or in 95 F. + heat, then I will fill up with higher
octane on that tank of gas.
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David K
Honored Nomad
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| Quote: | Originally posted by Maderita
brewer,
Which engine do you have in the Cherokee, the 2.5L or 4.0L?
Both engines were designed to run on 87 octane. However, that doesn't always mean that 87 is sufficient.
There are several problems that may cause your engine to ping with 87 octane.
Carbon buildup, running hot or in hot weather, improper timing, spark plug gap, etc. Does your Cherokee have a recent valve job? Surfacing the head
will increase compression and might require higher octane to compensate.
A tuneup might fix the pinging/detonation problem.
Do NOT continue to drive the vehicle if it is pinging more than momentarily upon sudden hard acceleration. Excessive pinging can cause serious damage
to your engine. Get a tuneup. If that doesn't eliminate the pinging, then switch to a higher octane fuel.
I have had more than one Jeep 4.0L engine that needed 89 octane to run without pinging. My personal tolerance for pinging is zero. A few cents more
per gallon is far cheaper than a complete rebuild.
Bob and Susan,
Please don't believe everything you read in those trite and brief consumer articles. Yes, I've read those too. Passing on that (mis)information as if
you have vast mechanical experience/knowledge is leading folks into trouble. Higher octane fuel is NOT simply a marketing gimmick.
Many vehicles are designed to run on higher octane. The manufacturer will specify the octane requirement.
Heavy demands on an engine, such as steep grades or towing, might call for higher octane than the manufacturer recommended originally. So can hot or
desert conditions. So can the internal condition of an engine or the engine tune. There are numerous variables.
I use what my engine is "happy" (zero pinging) with. If I anticipate pulling grades, towing, or in 95 F. + heat, then I will fill up with higher
octane on that tank of gas. |
Excellent answer!!! 
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Bob and Susan
Elite Nomad
Posts: 8813
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Location: Mulege BCS on the BAY
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"a fool and his money are soon parted" Thomas Tusser an English poet
welcome to 2014
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captkw
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gas
Maderita has the right answer....more or less...It does not matter what the MFG says... that's a generic profile answer and gas and motors
change...pinging is BAD and if your motor needs better (octane) give it to her...octane slows the flame speed. and pinging is very harmful to the
piston Crown and can/will melt a piston....Bob & susan..why are you always SOO off the mark in regards to motors and electrical???? 30 yrs ago in
Baja you HAD to add octane booster and retard your ignition timing if you wanted to drive normal...or you would sound like a diesel !!!
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durrelllrobert
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It's all about the compression ratio
The higher the compression ratio the more octane is needed so the fuel can burn completely and efficiently. If the fuel octane is deficient a pinging
noise may be heard when an engine is under a load . When compression exceeds 9.5 to 1 a person should use midgrade or premium fuel for the best
performance. Compression over 11 to 1 should go to a low grade aviation fuel that starts at about 102 octane.
Most competition engines are 13 to 1 and over so they require higher octane fuel . I was reading about Trophy trucks yesterday and some of them have
16 to 1 compression and use 124 octane fuel to achieve 700 horsepower.
The 4.0 liter jeep engine has an 8.8 / 1 compression ratio so 87 octane Pemex should be sufficient.
Bob Durrell
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RnR
Senior Nomad
Posts: 839
Registered: 5-1-2010
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If it pings, use a higher octane.
The Magna in southern Baja is somehow different than the Magna in northern Baja.
My 1997 F250 runs fine on northern Magna. First fillup south of Guerrero Negro (Mulege or Loreto), it pings like crazy when towing. Have to switch
to Premium.
Then northbound, run premium to GN, fill with Magna in GN, no pinging until southbound again next year.
Usually runs fine in southern Baja on Magna when not towing. Just an occasional ping under heavy acceleration. Also runs fine on 87 octane in the
US.
This is nothing new, so no changes in the engine condition. It's happened every year since the truck was new in 1997.
To paraphrase the Capt, "just give your motor what she likes...."
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captkw
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pinging
its more than just compression.....air densitey,,temp..(motor & air/gas intake)...rpm,,load,,,ignition timing and a host of other factors..for the
normal joe,, just run enough octane so your motor does not ping...also on newer cars EGR !!
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MitchMan
Super Nomad
Posts: 1856
Registered: 3-9-2009
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If you take your vehicle to regular dealer maintenance over time and you always use regular gas, does that mean that the dealer maintenance service
will tune your vehicle to run on regular and therefore eliminate any and all pinging?
I have all Toyotas now (2000 Echo, 2005 Corolla, 1998 2.7 L 4wd Tacoma) and all have never pinged on regular. Used to have all Volvos...same
situation: regular and no pinging.
Actually, the only pinging I experienced on regular was with my first vehicles; a 1959 4 banger Austin Healy Sprite and a 1955 Chevy V8, both owned
during the 1960s.
[Edited on 5-9-2014 by MitchMan]
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