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Unread 07-11-2013, 09:23 AM   #1
KTGator
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Gas for 84 CJ 7

I was told when I picked up my Jeep that I should use premium gas..Does anyone else do this? @ 4.09 it hursts a little..

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Unread 07-11-2013, 09:27 AM   #2
Chewtoy
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not unless you have some sort of high compression monster motor. Regular is just fine.
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Unread 07-11-2013, 09:30 AM   #3
texas1al
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I find that my worn 258 runs a lot better on higher octane gas, but I've never run 91 premium. I switched from regular 87 to mid-grade 89 a couple years ago and it cured some knocking I had at load. I tuned the carb and timing for years, but could never completely eliminate the knock until I upgraded to 89 octane.
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Unread 07-11-2013, 09:31 AM   #4
WindKnot
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I use at least mid grade. and it does hurt. It also gets rid of the pinging. My engine isn't stock though anymore either.
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Unread 07-11-2013, 09:59 AM   #5
bradleybrb
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We have one station here that sells ethanol free gas. It's only 87 octane, but my jeep runs as good or better on it than it does premium.
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Unread 07-11-2013, 11:43 AM   #6
scrapman
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The ONLY reason to go up in grades of gasoline is if you can not get your engine to quit pinging (detonating) on the grade you are using. If your engine runs fine (without pinging) on regular grade, it will not run any better on the higher grades.
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Unread 07-11-2013, 12:15 PM   #7
texas1al
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Yeah, I was going to add that I have to use "city gas" with 10% ethanol unless I want to drive 50 miles to get pure "country gas" with no ethanol. Not sure if that makes a difference at the same octane rating.
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Unread 07-11-2013, 12:17 PM   #8
LumpyGrits
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I run prem in mine, and always have.
LG
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Unread 07-11-2013, 12:31 PM   #9
82JeepCJ7
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I run the cheapest non-ethanol fuel I can buy.
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Unread 07-11-2013, 12:49 PM   #10
wellmax
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I always fill my old jeep up with non-ethanol when I make a gas run for all my other small gas engines,
lawn mower, tiller, chainsaw, old tractor, etc:

the old jeep runs fine and starts good on non-ethanol gas.

just hope the government stays out of the local gas business and continues to allow the stations to sell non-ethanol gas.
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Unread 07-11-2013, 02:01 PM   #11
KTGator
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THANKS for all the feedback..This was a big help....
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Unread 07-11-2013, 05:19 PM   #12
brownbagg
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i feel my jeep with what ever gas around, even used outboard gas, if the motor pinging, its not adjusted right. they very few cars on the road today that needs the high dollar ****
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Unread 07-11-2013, 05:26 PM   #13
lucdog
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Quote:
Originally Posted by scrapman
The ONLY reason to go up in grades of gasoline is if you can not get your engine to quit pinging (detonating) on the grade you are using. If your engine runs fine (without pinging) on regular grade, it will not run any better on the higher grades.
This^^^
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1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
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Unread 07-11-2013, 05:44 PM   #14
keith460
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I run 89 octane as I can notice the difference over 87. My engine is also 30 over on the pistons and the head and block were decked as well so the compression is up a little over stock configuration.

I tried 91 octane a few times but their is no difference between using 89, so 89 it is for me.
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Unread 07-11-2013, 10:51 PM   #15
lucdog
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Quote:
Originally Posted by keith460
I run 89 octane as I can notice the difference over 87. My engine is also 30 over on the pistons and the head and block were decked as well so the compression is up a little over stock configuration.

I tried 91 octane a few times but their is no difference between using 89, so 89 it is for me.
I think one would find this is true, the higher the compression, the higher the octane needed.
The GTP Pontiac we had with the supercharged 3.8 V6 required 91 octane. As well as the Buick Gran National with the turbo charged 3.8 ( didn't have one, a friend did)

Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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