Former Williams man Patrick Head says Formula 1 engines are "far too expensive" for what they are.
This season, the price of engines shot through the roof as the sport switched from 2.4-litre V8 engines to 1.6-litre turbocharged V6s.
And in a time when the sport is trying to curb rising costs, Head reckons the price of the engines has become too much.
He told the BBC: "I think the engines are fascinating pieces of kit, but I think they are far too expensive for what they are supposed to be doing.
"You could produce 800 BHP for €2m ($2.7m) a team each year. I think the teams are having to pay about 10 times that amount. It's a very expensive way of powering Formula...
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