▁Du o ▁D yna ▁Air ▁C ool ing . ▁This ▁warm ▁air , ▁and ▁additional ▁hot ▁air ▁from ▁around ▁the ▁exhaust ▁manifold , ▁was ▁then ▁used ▁to ▁heat ▁the ▁passenger ▁compart ment , ▁a ▁novel ▁approach ▁which ▁was ▁not ▁commonly ▁used ▁after ward . ▁H ideo ▁Sug i ura , ▁then ▁the ▁head ▁of ▁the ▁R & D ▁Center , ▁looked ▁back ▁upon ▁the ▁sentiment ▁of ▁the ▁time : ▁" We ▁had ▁a ▁powerful ▁company ▁founder , ▁Mr . ▁H onda , ▁who ▁was ▁on ▁top ▁of ▁the ▁engineering ▁operation . ▁He ▁also ▁had ▁expert ise , ▁which ▁he ▁had ▁acquired ▁through ▁a ▁string ▁of ▁enorm ous ▁success es . ▁Having ▁such ▁a ▁leader , ▁the ▁sentiment ▁in ▁the ▁company ▁was ▁that ▁we ▁had ▁to ▁see ▁it ▁all ▁the ▁way ▁through , ▁regardless ▁of ▁where ▁the ▁road ▁might ▁take ▁us . ▁There ▁was ▁to ▁be ▁no ▁surrender . ▁We ▁could ▁not ▁give ▁up ▁half way ." ▁ ▁" Stream lin ing ▁the ▁bul ky ▁construction ▁of ▁the ▁air - co o led ▁engine , ▁and ▁giving ▁it ▁the ▁quiet ness ▁of ▁a ▁water - co o led ▁engine , ▁will ▁create ▁the ▁ideal ▁power ▁plant .... " ▁With ▁that ▁concept ▁in ▁mind , ▁the ▁research ▁engine ers ▁worked ▁t ire lessly ▁to ▁achieve ▁their ▁ideal . ▁It ▁was ▁from ▁this ▁gru eling ▁process ▁of ▁trial ▁and ▁error ▁that ▁the ▁D D AC ▁integrated ▁dual ▁air - co o led ▁engine ▁was ▁achieved . ▁The ▁initial ▁prototype ▁was ▁completed ▁in ▁July ▁ 1 9