Main Navigation
Main Content

2-stroke rammer – Health and environmental protection in focus

Wacker Neuson has a long tradition in the field of soil compaction: Hermann Wacker invented the first electric vibratory rammer as early as 1930, and the first rammer with a combustion engine also came from Wacker. In the meantime, Wacker Neuson offers a wide range of rammer models with gasoline, diesel or electric drive - today, however, cordless with rechargeable battery. In the field of conventionally powered models, the gasoline rammers with two-stroke engines from Wacker Neuson are characterized by the lowest overall emissions on the market.

Compaction equipment is essential on any construction site. After all, wherever foundations are to be placed or the soil has been removed and excavated, compaction should be carried out for optimum results. Especially for applications in confined spaces or for compaction work in trenches, the compact rammers play to their strengths. Wacker Neuson is the only manufacturer on the market to offer vibratory rammers with two-stroke engines.

Lower emissions - higher health protection

The two-stroke engine developed by Wacker Neuson and built in Germany offers the lowest total emissions of carbon monoxide (CO), nitrogen oxides (NOx) and hydrocarbons (HC) of all gasoline-powered vibratory rammers on the market, in addition to high performance and durability. These emissions are particularly relevant with operator protection in mind: The focus is on carbon monoxide, which is harmful to the operator's health and often goes unnoticed because it is odorless and tasteless. In trenches in particular, this chemical compound poses a health risk. Wacker Neuson has been equipping all two-stroke rammers with catalytic converters for many years. As a result, CO emissions are very low, even significantly lower than with four-stroke rammers.

WM80: The proven two-stroke engine from Wacker Neuson

The WM80 two-stroke engine, which was specially developed by Wacker Neuson and manufactured in Germany, emits up to 40 percent less CO and HC/NOx emissions than four-stroke rammers thanks to the perfect tuning of the engine's control times, the resulting optimum oxygen content in the combustion mixture and, in particular, the additional catalytic converter. The rammers are far below the applicable emission limits not only when new. The effectiveness of the engine catalyst solution has also been proven and certified after 300 hours of operation. The automatic shutdown after ten minutes of idling not only saves fuel and protects the engine, but also avoids unnecessary pollutant emissions.

Powerful, simple, efficient

With a high number of strokes and a strong stroke, all two-stroke rammers deliver a strong work result. With the same power, the two-stroke rammer is around two kilograms lighter than the four-stroke model. This, and the compact dimensions of the two-stroke engine, allow comfortable handling, especially in trenches. The two-stroke engine is also extremely robust and less complex, which saves on repair and maintenance costs. Another "plus" point: Wacker Neuson's Plus series models eliminate the need for pre-mixing: The two-stroke oil is filled into a separate tank, the tank is locked for 120 hours of operation and the mixture is automatically adjusted. This means that only gasoline needs to be refilled during everyday work - avoiding misfueling. Operators also benefit from low hand-arm vibrations and the easy handling of the compact rammers.

Those who want to do without emissions altogether opt for the zero emission series from Wacker Neuson. This includes three battery-powered rammer models: The smaller AS30e model is a special rammer for the compaction of pipe coils, while the larger AS50e rammer and the AS60e model are used for all classic rammer jobs. The compaction performance in each case corresponds to gasoline rammers of the same size class.

Situation in the Netherlands and Belgium

In the Netherlands, the following legal limits for employees have been in effect since August 21, 2018:

Exposure durationTime-weighted average concentration of CO in ppm
8 hours20

The current limit value can be found on the website of the Rijksinstituut voor Volksgezondheid en Milieu (RIVM). Conversion: ppm = mg/m³ x 0.858

For more information, see: