 Tyrrell started making its own cars towards the end of 1970 , and March 's 1971 program in Formula One was much reduced , with no recognised front @-@ running driver . The <unk> and <unk> sponsorship was insufficient and Mosley failed to attract a large <unk> for 1971 . <unk> author Mike Lawrence has suggested that the shortfall forced him into short @-@ term deals , which maintained <unk> , but were not in the best long @-@ term interests of the company . Mosley negotiated a deal for the team to use Alfa Romeo engines in a third car , bringing much needed funding . The engines proved <unk> , and his hopes of an ongoing partnership with the Italian automobile manufacturer were not met . Nonetheless , March again finished third in the constructors championship , and works driver Ronnie Peterson , in a <unk> <unk> @-@ powered car , was second in the Drivers ' Championship . March 's financial <unk> continued : the company had lost £ 71 @,@ 000 at the end of 1971 . Mosley and Rees disagreed over how to rectify the situation and Rees left March early in 1972 . 
