Q: why would I have to buy an engine if all I need is piston rings and cam shaft? on 1996 Plymouth Voyager

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The car makes a loud noise when running as if there is no oil in the motor. I was told by someone that the motor has "thrown a rod"
(1) Answer
it sounds easier than it is. it makes more sense from a dollar and cent standpoint to replace the motor rather than have to put in just the parts that broke. besides, the only way to tell the damage is disassemble it. that means a lot more money for you to spend to find out you still need the motor replaced.