Gas for 84 CJ 7 - JeepForum.com

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post #1 of 26 Old 07-11-2013, 08:23 AM Thread Starter
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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post #2 of 26 Old 07-11-2013, 08:27 AM
Chewtoy
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not unless you have some sort of high compression monster motor. Regular is just fine.

With a great Jeep comes an empty wallet.
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post #3 of 26 Old 07-11-2013, 08:30 AM
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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post #4 of 26 Old 07-11-2013, 08:31 AM
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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post #5 of 26 Old 07-11-2013, 08:59 AM
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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post #6 of 26 Old 07-11-2013, 10:43 AM
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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post #7 of 26 Old 07-11-2013, 11:15 AM
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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post #8 of 26 Old 07-11-2013, 11:17 AM
LumpyGrits
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I run prem in mine, and always have.
LG
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post #9 of 26 Old 07-11-2013, 11:31 AM
82JeepCJ7
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I run the cheapest non-ethanol fuel I can buy.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #10 of 26 Old 07-11-2013, 11:49 AM
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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post #11 of 26 Old 07-11-2013, 01:01 PM Thread Starter
KTGator
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THANKS for all the feedback..This was a big help....
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post #12 of 26 Old 07-11-2013, 04:19 PM
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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post #13 of 26 Old 07-11-2013, 04:26 PM
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^^^

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #14 of 26 Old 07-11-2013, 04:44 PM
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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post #15 of 26 Old 07-11-2013, 09:51 PM
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

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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