▁dies el ▁( com pression ▁ign ition ) ▁and ▁pet rol ▁applications , ▁although ▁the ▁dies el ▁version ▁never ▁reached ▁production . ▁Tra ces ▁of ▁its ▁dies el ▁design ▁lie ▁in ▁the ▁very ▁heavy ▁construction ▁using ▁Her on ▁cyl inder ▁heads ▁and ▁the ▁necessity ▁for ▁d ished ▁p ist ons ▁to ▁decrease ▁compression ▁for ▁the ▁pet rol ▁engine . ▁The ▁cast ▁iron ▁Es sex ▁V 6 ▁is ▁a ▁heavy ▁engine ▁due ▁to ▁its ▁st ur dy ▁design ▁we igh ing ▁in ▁at ▁, ▁ ▁more ▁than ▁the ▁al umin um ▁al loy ▁R over ▁V 8 , ▁for ▁example , ▁the ▁Es sex ▁V 6 ▁also ▁has ▁a ▁very ▁heavy ▁yet ▁st ur dy ▁four - main ▁bearing ▁cross plane ▁c rank sh aft ▁with ▁large ▁ ▁main ▁journ als , ▁and ▁a ▁heavy ▁fly w heel ▁in ▁order ▁to ▁smooth ▁out ▁the ▁power ▁delivery , ▁sometimes ▁Es sex ▁V 6 ▁engines ▁are ▁referred ▁to ▁as ▁an ▁" Es sex ▁L ump " ▁referring ▁to ▁the ▁weight ▁of ▁these ▁engines . ▁In ▁spite ▁of ▁its ▁heav iness , ▁the ▁Es sex ▁V 6 ▁was ▁used ▁as ▁the ▁main ▁work hor se ▁and ▁a ▁high ▁performance ▁option ▁for ▁medium ▁to ▁full - s ized ▁cars ▁like ▁the ▁Cap ri ▁the ▁Gran ada ▁and ▁Trans it ▁v ans ▁supplied ▁by ▁Ford ▁to ▁the ▁Police ▁and ▁Am bul ance ▁services ▁in ▁the ▁UK ▁throughout ▁the ▁late ▁ 1 9 6 0 s ▁and ▁ 1 9 7 0 s ▁and ▁up ▁until ▁ 1 9 8