The gears in the planetary gear trains are sized to provide {HEAD ~ a desired speed reduction} from {TAIL ~ the crank shaft} to the cam shafts 
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The gears in the planetary gear trains are sized to provide { HEAD ~ a desired speed reduction } from { TAIL ~ the crank shaft } to the cam shafts
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH