1985 AMC 150 and E-85 usage? - JeepForum.com
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post #1 of 5 Old 01-15-2011, 05:00 PM Thread Starter
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1985 XJ Cherokee 
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1985 AMC 150 and E-85 usage?

I have a 1985 model year AMC 150 4-cylinder. Before you press the reply button right away with a generic response read this first paragraph please.

To start, I have refitted all the fuel lines to E-85 compatability. The mechanical fuel pump has been certified for E-85 as well. I am running a Weber 38/38, which by accounts given to me, is safe to run E-85 through. This is not a TBI/EFI based motor so there is no computer based fuel control. With that said-

I have been told that running E-85 will melt my pistons due to the higher running temp (and the fact they are aluminum and designed for a 1994 model year 150). I am inclined to think otherwise since my spark plugs are showing a cooler and cleaner burn. (the plugs look better)

So, whats your opinion(s)?

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post #2 of 5 Old 01-15-2011, 07:11 PM
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1974 CJ6 
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You will need to make sure that you are supplying enough fuel as e-85 burns leaner. If you are going to run only e-85, I would look into having the head milled/new pistons to increase the compression ratio to take advantage of the higher octane of the e-85.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #3 of 5 Old 01-15-2011, 08:01 PM Thread Starter
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This is a bored and stroked 4 cylinder. The head was milled 2mm during its rebuild Its compression is running 200-210PSI per cylinder at the moment. I put some E-50 in to see how the spark plugs would handle it and after 200 miles the plugs looked great. Used my spider cam and the pistons show no signs of damage, valves show no signs of wear yet.. (lol, only 2,200 miles on the rebuild)
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post #4 of 5 Old 10-02-2012, 04:16 PM
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1985 CJ7 
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Just curious about this engine as I am thinking of stepping up my carbed 150. Im thinking of a clifford cam and header with ported head and intake. What other head work was done to yours and what are the details on the bore and stroke sizes and parts. More importantly how well does it run. What does the power feel like?


The Last Great American Hero... the demi-god... to which speed means freedom of the soul.
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post #5 of 5 Old 10-04-2012, 05:20 PM Thread Starter
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1985 XJ Cherokee 
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Bored 85 over. Valves were just given a 5 angle grind. However at 14k miles cylinder 3 lost 70 psi on compression. Blew out a comp ring.. Havent had time to pull the motor to fix it. It still runs so i run it. Lol
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