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I like the siamese engine concept and have thought about it much. The biggest hold up for that one is probably NVH: if you've ever run/been in a twin engine plane with the engines out of synch you'd know how GD annoying anything less than perfect synch is.
The other hold up I've considered is that of the deac cyls cooling down too much, so that they aren't at operating temp when called upon. I think that one could be largely overcome via a shared cooling system.
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