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Yes, I have. I've also looked into the Koenigsegg free valve system, adaptable to any ohv engine, but that's far out of my budget. There are valve systems that have variable lift controlled by extra pieces between the cam and valve stem. I know that GM's V4-6-8 engine left the valves operating normally, and just cut the spark. I know that in GM's system, they didn't rotate the inactive cylinders, and build up of oil and fuel in the cylinders caused problems. I know that Honda has some V6s that can become 3s at low load, and I don't know of any problems with them, but I suspect uneven wear in the "off" cylinders over time. Rotating through each cylinder seems to be the best way to even out wear,and prevent build up.I will be glad to look into any new material you can direct me to.
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