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

LeMans winner Johnny O'Connell answers your driving questions

The guy's been racing professionally since 1987. He's won at LeMans four times. He's used to success, but this week he's an instructor at Bondurant, trying to make a halfway decent driver out of your humble editor.

Drivers undecided over 20mph zones

DRIVERS are against the idea of a blanket 20mph speed limit on urban roads but are open to their targeted use, according to research published today by road safety charity, Institute of Advanced Motorists (IAM). Half of drivers from the UK are against a blanket 20mph speed limit with less than a third willing to embrace the idea and a fifth undecided. Male drivers are more likely to be against the idea than female.

Concept Car of the Week: Pininfarina CNR-PF (1978)

In the 1970s alarm bells were ringing in the energy sector as a series of energy crises and rising fuel prices spiralled. The car industry was forced to produce a new generation of more efficient cars and designers were putting new models through wind tunnels to optimize their aerodynamic performance to reduce aerodynamic drag. Some pushed the limits further than others and none more so than Pininfarina, which designed a car that slipped through the air twice as efficiently than any other.