The 2011 Ski-Doo MX Z TNT introduces an all-new 4-stroke powerplant that will soon replace the old fan-cooled, 2-stroke, twin-cylinder unit. As arguably one of the most interesting new products from BRP, the Rotax Advanced Combustion Efficiency (ACE) 600 featuring a double overhead camshaft ranks among the cleanest and most fuel-efficient engines in the industry.

The 2011 Ski-Doo MX Z TNT ACE 600 is smooth, friendly and efficient like very few other snowmobiles. (Photo: Matthieu Lambert/Moto123.com)

Based on the excellent REV-X chassis, the lightest snowmobile platform out there, the new Ski-Doo MX Z TNT ACE 600 offers all the main benefits of its larger siblings, including unparalleled steering precision, remarkable agility and stability in corners, and most importantly, enhanced comfort and ergonomics. This awesome combination allows the rider to get more fun and more mileage out of each trip, regardless of trail conditions.

Technologically advanced
The new liquid-cooled, 600-cc twin looks like the benchmark for any entry-level sled. It proves quiet, smooth, efficient and rider-friendly, with performance that compares to the dirty old 2-stroke engine. And don't forget the extra torque at low and medium revs.

A self-adjusting drivetrain ensures low maintenance, while a 2-litre dry-sump lubrication system reduces weight and friction. The engine can be mounted lower, which improves stability. The electronic fuel injection system uses a pair of Siemens injectors and a single 42-mm throttle body. Furthermore, an electric starter eliminates the crown gear on the drive pulley.

Clean and efficient
This particular model's low emissions exceed EPA standards while real-world fuel consumption amounts to 10.6 L/100 km on average. Bear in mind the test was conducted on melting snow. Rotax engineers are promising a mere 8.2 L/100 km in normal conditions once the engine is fully broken in.

Thank God for the amazing REV-X chassis, which doesn't seem to be affected by the substantial weight transfer as the rider releases the throttle. (Photo: Matthieu Lambert/Moto123.com)