A few years ago lots of F1 sidecars went to dry sumps, but now many are using wet sumps. Sidecars don't pull as many Gs as winged cars and also spend a lot more time wheelspinning with only one drive wheel. They are using full throttle more than solo bikes use and until recently were allowed unlimited engine mods so many were chasing max power at the expense of reliability. Many sidecar championships, world and British for example, now are mechanically standard and less engine problems seem to have followed.
Jeff
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