The main differences between the LH94 and its predecessor were that the LH94 had a smaller fuel tank to take advantage of the reintroduction of refuelling in pitstops in 1994 and a different engine. In Larrousse had used Chrysler-funded Lamborghini V12s but the programme was halted for 1994. The team decided to return to Ford power, using the Series 7 version of Cosworth HB engine which had powered the Benetton and McLaren teams the previous year. Larrousse had previously used Ford Cosworth engines in , and .
