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When Caterpillar introduced ACERT Technology in early 2003 for on-highway applications, it was setting the stage for future off-road designs. The company now offers a complete line of off-road engines with ACERT as the basis for meeting Tier III emissions requirements.

ACERT Technology is also being utilized by Caterpillar's Perkins Engine division. Perkins recently introduced a new engine series that includes electronic versions utilizing this advanced emissions control technology.

Following is a look at the most recent Tier III engine introductions from both companies, as well as a glimpse at what lies ahead.

From smallest to largest

Over the past two years, Caterpillar has introduced nine off-road engines equipped with ACERT technology. The smallest of these models is the C6.6 industrial engine, which replaces the 3056E.

The C6.6 provides 10% more displacement than the 3056E, all within the same size envelope. It is rated from 119 to 250 hp with 728-ft.-lbs. maximum torque at 1,400 rpm. Only an air-to-air charge cooled turbocharger is available.