Design was by Giorgetto Giugiaro's Italdesign. Its platform put together MacPherson suspension developed for the Beta with four-cylinder, SOHC engines derived from the Fiat Ritmo. The Fiat engines were revised by Lancia engineers with a Weber twin-choke carburettor, a new inlet manifold, exhaust system and ignition. To achieve its market positioning the Delta offered features uncommon in the segment, as fully independent suspension, rack and pinion steering, available air conditioning, optional split-folding rear seat, height-adjustable steering wheel, and defogger. Its three-piece body-coloured bumpers made from polyester resin sheet moulding compound were claimed by Lancia to be a first in the industry. The heating and ventilation were developed with help from Saab, experts in the field, who also claimed to have had a hand in the rust proofing of the Delta. It was also thanks to Saab that the bootlid was extended all the way down to the bumper, simplifying loading and unloading.