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Brian, I think Gade also made an opposed twin, basically two aircooled hit and miss cylinders much the same as my Recent Gade build but on opposite ends of the main bed casting. Just need to find the photo I saw of it (as a model)The other option would be to say your engine is a 180degree Vee twin and then you can use a single crank pin
Jason--You're right, and that is a great idea---as long as the cylinders are in line with each other. Unfortunately, with them offset as shown, it won't work. I have found that by using a 36 tooth and an 18 tooth gear, I can avoid having to cut a jockey gear to fit between them since I don't have the same physical constraints as the original engine. I have to do a bit more modeling to decide whether I like them, or if they will look too big and "clunky".
I don't understand; VWs have offset cylinders and use only one camshaft centered under the crank?