Question about 1983 Jeep CJ5

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Whats the timming for a 1975 jeep cj5 with a straight 6 and a i bbl carb ?

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I don't have that info, but whatever the setting was then, it won't apply now as fuel quality is much poorer than it was back then. Therefore, correct setting will likely put you into detonation. Best thing you can do is if it's an automatic, set the timing at TDC, then with the engine running, put it "up against the brake" in gear, increasing rpm. Keep advancing it 'till you hear the engine detonating, then back off two to four degrees. If it's a stick, do the same thing, but just run it up to the top of first gear going down the road and listening for detonation, then backing off timing as I outlined.
Another way of "baselining" your timing is to put a vacuum gauge and tach on it and advancing to the highest vacuum and rpm, then backing off a few degrees. Once you have established what the engine will "like" with todays fuel, use that timing setting for future reference. One note...If it "rumps over" when you try to start it hot, take a couple of more degrees out of it.
What I have outlined is "power timing" which isn't a new thing. Timing on every engine is not the same even the same size in the same vehicle.
The numbers given by the factory are not written in stone, they are just a baseline for experimentation. The important thing is to get the most power without going into detonation while still avoiding hard starting.
Today, computers do that for you.

Posted on Nov 19, 2009

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  • mashunitjeep Aug 24, 2011

    best timing for it would be set around 5-8 degrees with vacuum advance disconnected

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