P ▁( T ipo ▁ 5 5 ), ▁later ▁renamed ▁L ancia ▁G amma , ▁is ▁a ▁passenger ▁car ▁produced ▁by ▁the ▁Italian ▁car ▁manufact urer ▁L ancia ▁during ▁ 1 9 1 0 . ▁It ▁was ▁derived ▁from ▁a ▁previous ▁B eta ▁model , ▁now ▁equ ipped ▁with ▁a ▁bigger ▁engine . ▁In ▁total , ▁ 2 5 8 ▁units ▁were ▁built . ▁In ▁ 1 9 1 1 , ▁the ▁type ▁was ▁su pers eded ▁by ▁the ▁larger - eng ined ▁and ▁more ▁powerful ▁L ancia ▁ 2 0 - 3 0 ▁H P ▁D elta . ▁ ▁The ▁D elta ▁was ▁built ▁with ▁two ▁wheel b ases , ▁normal ▁and ▁short . ▁The ▁latter ▁was ▁dest ined ▁for ▁competition - orient ed ▁C ors a ▁models , ▁to ▁be ▁bod ied ▁as ▁open ▁two - ▁or ▁three - se aters . ▁ ▁Spec ifications ▁The ▁engine ▁was ▁a ▁T ipo ▁ 5 5 ▁side ▁val ve ▁inline - four , ▁with ▁cast - ir on ▁mon ob loc ▁engine . ▁B ore ▁and ▁stroke ▁measured ▁, ▁for ▁a ▁total ▁disp lacement ▁of ▁ 3 4 6 0   cc . ▁The ▁engine ▁produced ▁ 4 0   hp ▁at ▁ 1 5 0 0   r pm , ▁giving ▁the ▁car ▁a ▁top ▁speed ▁of ▁— the ▁same ▁as ▁the ▁six - cy l inder ▁D ial fa ▁of ▁two ▁years ▁earlier . ▁ ▁The ▁transmission ▁was ▁a ▁ 4 - speed ▁g ear box ▁with ▁a ▁multi - plate