bi ke ▁engine ▁the ▁Revolution ▁was ▁joint ly ▁developed ▁and ▁engine ered ▁with ▁the ▁German ▁sports ▁car ▁manufact urer ▁Por sche . ▁The ▁V R SC ▁marks ▁Har ley ' s ▁first ▁collaboration ▁with ▁Por sche ▁since ▁the ▁Nova ▁project , ▁which , ▁like ▁the ▁V - R od , ▁was ▁a ▁radical ▁departure ▁from ▁Har ley ' s ▁traditional ▁line up ▁until ▁it ▁was ▁cancel led ▁by ▁AM F ▁in ▁ 1 9 8 1 ▁in ▁favor ▁of ▁the ▁E volution ▁engine . ▁A ▁derivative ▁of ▁the ▁Revolution ▁called ▁the ▁Revolution ▁X ▁was ▁later ▁used ▁on ▁the ▁entry - level ▁Har ley - David son ▁Street , ▁first ▁released ▁in ▁ 2 0 1 4 . ▁ ▁Public ▁reception ▁ ▁Car ▁& ▁Driver ▁declared ▁that ▁the ▁Har ley - David son ▁phenomen on ▁was ▁" c ultur ally ▁rather ▁than ▁techn olog ically ▁driven ; ▁so ▁imagine ▁our ▁surprise ▁at ▁seeing ▁the ▁company ' s ▁new est ▁ride , ▁the ▁V - R od , ▁complete ▁with ▁a ▁liquid - co o led ▁DO HC ▁four - val ve ▁V - t win ▁developed ▁in ▁partners hip ▁with ▁Por sche ▁Engineering ." ▁They ▁added , ▁" we ▁think ▁the ▁V - R od ▁is ▁a ▁serious ▁threat ▁to ▁its ▁own ▁stable m ates ▁as ▁well ▁as ▁to ▁cru is ers ▁from ▁other ▁manufact ur ers . ▁It ' s ▁that ▁good ". ▁ ▁Motor cycle ▁Cru iser ▁wrote ▁" The ▁V - R od ▁was ▁intended ▁to ▁bring ▁in ▁more ▁than ▁the