Why is the inline 6 engine in Jeeps the best?
The Jeep 4.0L is indeed a VERY good engine. It’s ALL cast iron and also hails from the John F. Kennedy era, circa the early 1960s, when it was on the drawing board and put into production. The engine was a Chrysler engine to 2006, but it’s an AMC engine all the way. What ChryCo. did was refine it for noise, harshness and vibration and upgrade the computer system to OBDII and reinforced the block itself with extra webbing and gussets (like it wasn’t strong enough already…) after they got it from American Motors Corp. The saving grace of the thing is it makes good torque for off-road use. This is done by it’s long heavier crank as opposed to the new Wrangler JK’s (JoKe?, JunK?) stubby lightweight V6 crank = more rotating metal. This “modern era” AMC straight six motor was responsible for being a base engine for almost all of AMC’s cars and in every Jeep made after 1971 I think. Also this in-line six has 7 main bearings so it can distribute the load better and that also helps in keeping
