Shop now and take your engine tuning to the next level.Īchieving optimal engine performance requires precise timing adjustments, and a digital timing light is an indispensable tool for this task. Our advanced timing lights are easy to use and provide precise timing measurements for optimal engine performance. JeepHammer has some nice write ups on this if you search some.Improve your engine’s timing accuracy with digital timing lights from OnlineAuto. V8 shoudl be about 5500 maybe 6k red line. My 258 will hit 4500 pretty easy and know that is red line area. The I6 if healthy can have all the mech advance come in at 2500 because 3500 is screeming pretty good for 258. I think 2500 all in is too early for V8.did not look yet. Hot moves heat line on strap more to the or closer to the center electrode. Cold the line moves to the threads or at threads almost. The ground strap will have a temp line somewhere in the middle 1/3 of strap. The ground strap is a good indicaiton of heat/ proper operation temp. Do you know how to read your spark plugs? I have a few very good links some where. can be a second kind of detonation where the heat sets off the fuel early before the spark plug even fires off. Also too much advacne will get piston knock and its pushed back too soon. Get rid of combustion sooner and will run cooler. The heat has time to soak the cylinder with heat and get hoter. The way to think of it the flame and heat of combustion is in the cylinder longer with more advance. Too Much ADVANCE make the engine run hot. I know i have the I6 scanned but not sure of the V8 so take a look. Gotta take a look a the FSM advance curves. Neighbor bud has older nice snap on and I have the Actron. use them on I6 or 4 bangers and there can be some pretty big errors. There is also a caution the time lights are set up for a V8. Use the balance tape on the first go around and see if you similar reading on balance tape and time light advance indication. carefull Jeep Hammer said the fancy ones do not always work. Will need a vac guage, time light w/ advance is handy. And having all that adv in there 100% time is not a good idea. Some of the guys saying 10-12-16 sometimes for initial advance have a Limited DuraSpark Distributor with a small 3 deg mech limit slot. I ploted and matched the Jeep FSM curve, never get a rattle, no dead spots on throttle. So look at the correct manual/auto, the CJ. There also vary by Cj light or Full Size Jeeps heavy. The next resource is the Jeep Field Service Manuals have the advance curves for the 16 and V8. So the guys asking for the distributor type, yes should be looking. under load the Vac Advance gets minimized, then on the hwy cruise you vac level is up/ carb throttle plats mostly closed, and there is a fair amount of advance and will give good economy. then the vac advance is what is gong to work with engine. 4 wheeling, tails, maybe a trailer full of wood sometime. Can be more but the engine has to be healthy and you take a change of doing damage. The total advance will be in the 30-35 range. I feel the initial advance will be in the 3-6 range in general. Good for you getting your advance curve plotted and fixed.
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