02-24-2017, 07:36 PM
2/24/2017
When Jim Akkerman built the 24 hp circle crank 820s he always had external rods and aluminum plates to hold the block together. They were part of his article on how to build the engine. One of the rods actually passed through the Gem v-12 manifold he used.
In the early 70s I got ahold of a resleeved 820 block that was +60. I sold it to a friend to rebuild one of his motors and warned him to put a thick (or even multiple) head gaskets to keep the compression down. He put it together with so much compression you could barely turn the engine over. The block split open before the first heat ended.
When Jim Akkerman built the 24 hp circle crank 820s he always had external rods and aluminum plates to hold the block together. They were part of his article on how to build the engine. One of the rods actually passed through the Gem v-12 manifold he used.
In the early 70s I got ahold of a resleeved 820 block that was +60. I sold it to a friend to rebuild one of his motors and warned him to put a thick (or even multiple) head gaskets to keep the compression down. He put it together with so much compression you could barely turn the engine over. The block split open before the first heat ended.