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My original project plan included a freshened 4.0L engine, but after browsing the forum for the past week I’m strongly convinced I’d rather build a 4.5L stroker… it’s only a slight cost premium over keeping the 4.0L.
I’m having a devil of a time finding detailed engine specs for this thing. The OE service manual appears to be completely nonexistant on the used book market. And I can’t find simple things like rod big end diameter, big end width, main diameter, crank rod/main journal diameter, OE specified oil clearances, oil pressure, etc etc etc.
I’ve scratched up the following info on the 6.125” rod from a few places online, but can’t verify the accuracy. It’s also not nearly enough info for what I’m tentatively planning on doing.
Big end Bore Diameter 2.208"
Pin Bore Diameter .913"
I recently held a job as an engine builder – mostly Honda. It has crossed my mind to use Honda rod bearing journal sizes (2.0080”) to tightly control the oil clearances. But without knowing some additional critical dimensions I won’t be able to tell if it will work or not.
Of course, I could always get some wrecking yard components and measure them myself, but I’d much rather have the OE blueprint specifications.
I have a Chilton book that came with my Jeep but it totally sucks and has a lot of incorrect info in it. I’m actually starting to think it’s worse than nothing due to the wrong info.