Scuderia Toro Rosso to have advantage

Toyota's engine technical director Luca Marmorini has warned that the proposed rules to regulate the power of three-liter V10 engines in 2006 do not go far enough.

The Italian has joined a growing list of engine experts, including Honda Racing president Yasuhiro Wada, who are concerned about the new wave of 2.4-litre V8 engines.

The FIA allowed the use of V10s in 2006 to help the privateer teams that didn't have the finance to run the new engines, but now that Minardi has been sold to Red Bull this problem no longer exists.

"On the basis of the experimentations carried out so far, it's estimated that with the FIA-imposed limitation to V10 engines – that is a 77mm air intake and revs limited to 16,700rpm – these engines can reach a power output of around 800 horsepower," Marmorini told Autosport, after Toyota's customer team reported that V10s had a distinct advantage in a recent back-to-back test.

"Honestly, I don't think any of the current V8 engines can reach levels similar to these."