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cdmn 10-01-2012 19:27:41 66.228.249.73 Report to Moderator

The 9N engine was based on one half of a Mercury V8. When the first 1932 V8s came out about half of the blocks were scrapped for cracks. In WWII Ford built some of the Jeeps. Their blocks cracked. Willys blocks did not. It has to do with how the blocks are treated before they are machined. Slow cooling, long curing, perhaps. More expensive engines had a handful of Nickle put into the ladel before pouring. This added toughness. Hudson engines had bores very close to each other, but I'm not aware of cracking. I've worked on the small Case and Allis Chalmers engines. More often than not, they are cracked. Frost is suspected, since the radiator drains don't empty the blocks. The cracks didn't seem to ruin the engines however. [Reply]   [No Email]