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

MPG or performance: It's a trade with turbos

Some automakers say turbochargers offer high fuel economy and quick acceleration, the best of both worlds. Well, yes and no. Turbocharged vehicles allow automakers to keep power output high while they downsize engines for better fuel economy.

Mercedes fixes diesel injector problems

Mercedes say that a new injector system for C Class and E Class diesels with the OM651 engine have now been fixed. So extensive was the problem that many owners were waiting months for their cars to be fixed as Mercedes struggled with a mounting pile of broken cars and injectors that were failing. Mercedes tell us that the problem was fixed with the release of new injectors later in 2010, but Cars UK readers have continued to complain about their cars needing multiple visits to dealers with injectors failing multiple times (that original story garnered more than 500 comments from disgruntled Mercedes owners).

Porsche mulls smaller SUV, sports car

Porsche may develop a small SUV and a sports car smaller than the Boxster as it aims to double worldwide sales in the next three years. Bernhard Maier, head of sales and marketing at Porsche AG, confirmed that the company is looking into smaller and less expensive models “but we have taken no decision so far.” The small SUV has been code-named “Cajun”--short for Cayenne Jr. The success of the Cayenne SUV has given Porsche confidence to “investigate if there are other opportunities,” Maier said.