John is right about the Sipes angle (piston pin offset from centered), needs to be on the other side of the piston to make the rod angle work and not induce more piston to cylinder thrust.
As far as all the rest, not so fast. I have done 6 H1, and 2 H2 air cooled engines with cylinders mounted exactly as in the picture above, with stock crankshaft rotation. I did them when the original dirt car class TQ was created. Those engines did not have any piston issues caused by heat, seizure, nor thrust, they had nice pistons with the right Sipes angle done. As far as heat, there was also NO PROBLEM, and the crank spinning "the wrong direction" was not an issue.
In fact, there have been a few single crankshaft reversed cylinder racing engines built over the years, including Yamaha YZR 500 inline 4, two center cylinders facing forward, two outer ones facing reversed (Roberts rode one to two world championships and an AMA title), Honda NSR inline 3 and 4 cylinder engines, all cylinders facing to the rear, their 3 cylinder V engine, two front, one rear, and others, NO PROBLEMS.
Then, when the FIM had an active sidecar racing program, the engine of choice was the older TZ700/750 4 cylinder, air cooled, with different air cooled Yamaha, or Honda dirt bike cylinders, reversed in the cases.
Think about it, reversed cylinders on an H engine run the exhaust temps off the barrels far better than having that heat travel through the cooling fins, carbs stay cooler, and if one builds a simple aluminum sheet "ram air system", as we did for the TQ's, even better.
Then, we have engines like the RG and RZ 500, with same rotation cranks, that also used front and rear facing cylinders, in square and V configurations. And, later, lets not forget all the V4, V6, V8, V10 and V12 four stroke single crank engines, one side rotates "conventional", the other, "reversed". NONE of them are "apples to oranges".
As far as stock oiling goes, why not the stock system, with the delivery to the cases? There is room for it, and, with stock hard lines between the pump fittings and check valves. For other connections, a flexible plastic tubing, set in place of the hard plastic delivery lines, moves the delivery any place you like, just like the carb lines on H2 with 4 outlet oil pump systems use, no problems.
I don't have those engines in my possession, but I do know that all are still in existence, sitting away from the world, and all still run as built. And, NO, I don't have any pictures of them, I didn't take pictures of just about anything, except women in the pits.
Simple as that.
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