Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

One Lap of the Web: Aural delights and a Citro

-- Ayrton Senna positively dominated the 1990 Monaco Grand Prix: he came in with the fastest qualifying lap, started on pole, set the fastest lap, led every single one of them, won the thing, beating rival Alain Prost in the process, then went on to win the 1990 World Championship. The above video was what it's like to ride onboard with the brilliant Brazilian in his McLaren-Honda, which screams like a madman down the Monaco tunnel. -- Five Citro

One Lap of the Web: The Weird World of Wheels

-- Introducing the greatest television show you've never heard of: "Operation: Mystery!" Imagine if the "X-Files" took place in 1960s Japan, and had its own cool custom car the heroes rolled around in: the Tortoise, a pudgy little thing that resembled the unholy combination of an Opel GT and a Dustbuster. It was bulletproof (not really), had gullwing doors (really) and was based on a Subaru 360 (really!). Sadly, its whereabouts are unknown, and it might have disappeared into the ether along with the UFOs its heroes probably investigated.

Peugeot teases Onyx supercar concept

Peugeot has teased a supercar concept dubbed the Onyx ahead of its world debut at this month's Paris motor show. The Onyx will be further developing the supercar concepts that we've seen the automaker unveil in the past – such as the SR1 convertible and the EX1 electric racer – and is likely to indicate Peugeot's future design language as well as that of the RCZ's successor. From the teaser images we can see that the Onyx has the classic supercar wedge shape with a cab-forward design and a rear spoiler that rises at high speeds.