. ▁ ▁D F Z ▁The ▁announ cement ▁at ▁end ▁of ▁the ▁ ▁season ▁that ▁tur bo charg ed ▁cars ▁would ▁be ▁b anned ▁from ▁, ▁and ▁the ▁introduction ▁of ▁the ▁Jim ▁Clark ▁Cup ▁and ▁Col in ▁Chap man ▁Tro phy ▁champion ships ▁for ▁naturally ▁asp ir ated ▁cars ▁for ▁, ▁prompt ed ▁Cos worth ▁to ▁rev ive ▁their ▁elder ly ▁engine ▁design . ▁This ▁resulted ▁in ▁the ▁D F Z , ▁essentially ▁an ▁updated ▁version ▁of ▁the ▁final ▁D F Y ▁design . ▁However , ▁the ▁capacity ▁increase ▁for ▁the ▁new ▁ 3 . 5 L ▁naturally ▁asp ir ated ▁formula ▁running ▁alongside ▁the ▁ 1 . 5 L ▁tur bos ▁in ▁ 1 9 8 7 ▁allowed ▁Cos worth ▁to ▁increase ▁the ▁power ▁output ▁of ▁the ▁unit ▁to ▁. ▁The ▁engine ▁was ▁intended ▁as ▁a ▁temporary ▁measure ▁to ▁t ide ▁smaller ▁teams ▁over ▁until ▁the ▁tur bos ▁were ▁b anned ▁at ▁the ▁end ▁of ▁the ▁ ▁season . ▁T yr rell , ▁A GS , ▁March , ▁L ola ▁and ▁Col oni ▁ch ass is ▁were ▁all ▁power ed ▁by ▁Cos worth ▁in ▁ 1 9 8 7 . ▁Jonathan ▁Pal mer ▁of ▁T yr rell ▁eventually ▁won ▁the ▁drivers ' ▁Jim ▁Clark ▁Cup , ▁and ▁his ▁team ▁took ▁the ▁construct ors ' ▁la ure ls ▁in ▁the ▁Col in ▁Chap man ▁Tro phy . ▁The ▁engine ▁remained ▁in ▁service ▁with ▁minor ▁teams ▁until ▁the ▁end ▁of ▁ 1 9 8 8 ▁and ▁development ▁saw ▁a ▁slight ▁power ▁increase ▁to ▁.