Mercedes Motorsport boss Norbert Haug thinks that bigger capacity engines with more torque could be one way of improving the Formula One show in future years.
Haug, however, said his thoughts should not be interpreted as a criticism of the new 2.4-litre V8 engine formula that comes into effect next season.
"Let me stress, I'm not trying to be controversial and we are committed to the 2.4-litre V8s," Haug said, "but as regards the future of F1 in the long term, perhaps we should look at other solutions when we still have the opportunity.
"I believe that the future may not be 2.4-litre engines revving to 20,000rpm but perhaps bigger capacity engines with a rev limit. Even bigger than we are using now, perhaps. You could even perhaps have something of 4.0-litres restricted to, say, 15,000rpm.
"I hope I'm wrong but I'm not sure that high-revving 2.4s are the way to go. Another solution might give you something that would produce 750bhp and the possibility of 850bhp for a while, via, perhaps, an 'overtaking button' of which a driver is permitted to make limited use, or energy storage.
"That way, I think the possibility might exist to save money as well as to promote better racing."