HRT boss Luis Perez-Sala has expressed concerns F1’s 2014 engine regulations could push small teams out of business.
"Yes," he is quoted by Autosprint magazine, "today for a team like HRT, the engine costs account for 20 per cent of our total budget.
"If this figure will double in 2014, then I do not know what we would do."
The Spaniard and former Minardi driver suggested that, to cushion the blow, small teams should be allowed to buy a customer car from a bigger team.