The ARO 24 Series engines had a lower PS than their competitors and fell in the middle of the field for engine capacity.
ARO 83 PS (61 kW) at 4200 rpm ARO 67 PS (49 kW) at 4000 rpm ARO 95 PS (70 kW) at 4000 rpm Chrysler 120 PS (88 kW) at 5250 rpm Toyota 140 PS (103 kW) at 5000 rpm Ford 145 PS (107 kW) at 5500 rpm Ford 165 PS (121 kW) at 4400 rpm Cosworth 207 PS (152 kW) at 5250 rpm 3958 cc 3007 cc 2935 cc 2932 cc 2512 cc 2495 cc 2469 cc 2438 cc 
