Do you have a lawn in front or at the back of your home or office? Then you might already have observed that a lawn that has tall and unkempt grasses make properties look ugly. Thus, you need to maintain it using a quality and reliable lawn mower or the one that has good lawn mower ratings.
As an overview, a lawn mower is a machine that has an engine that can either be powered by gasoline or electricity. It comes in different sizes, as well as heights, which can either be adjustable or not. It also has multiple blades that are mainly responsible for cutting or trimming the grass.
On the other hand, lawn mower ratings are actually grading systems used by companies or manufacturers in order to emphasize the functional capabilities of their products’ engines. By understanding what each type of rating means, you will be able to determine the perfect lawn mower for your needs.
Lawn Mower Ratings: The Types
Generally speaking, gasoline and electric lawn mowers are rated based on the performance or functional capabilities of their engines. With that being said, let us look into the different types of lawn mower engine ratings that are being used.
Lawn Mower Engine Horsepower Rating System
Your lawn mower’s engine power refers to the speed or rate wherein a certain amount of task is done at a specific period of time. It is also the one that enables your lawn mower to move in a pushing, pulling, shoving, and dragging manner. In the United States, it is expressed using the horsepower or HP unit.
As an additional knowledge, the horsepower rating system is actually the traditional method by which a lawn mower’s power level is measured or rated. It is commonly used for lawn mowers that have large engine sizes like that of the riding lawn mowers. That is because of the fact that they are the type of lawn mowers wherein the power is distributed to the transmission, hydraulics, wheels, and other parts of the product.
Generally speaking, one HP means that 33,000 feet-pound of task or work can be accomplished within one minute. Thus, a lawn mower that has a horsepower rating of 10 can cut or trim approximately 330,000 feet-pound of lawn grass in one minute.
Therefore; the higher the horsepower of your lawn mower, the more power it generates and the faster you can finish cutting your lawn grass.
Lawn Mower Engine Torque Rating System
Mechanically speaking, the engine of your lawn mower moves by spinning or twisting around an axis. In order to achieve that, your lawn mower needs some force, which is popularly known in mechanics as torque and is expressed in revolutions per minute or RPM.
In simpler terms, a gross torque measurement refers to the direct force exerted or produced by the engine in order to move your lawn mower’s blade in a given period of time.
Taking that into consideration, the torque rating system can help you determine the amount of work that the machine can accomplish in one minute. Hence, the higher the torque power rating is, the more grass it can cut in one minute.
Lawn Mower Engine Ratings: Some Important Points to Remember
The lawn mower’s engine horsepower and torque ratings that you will see refer to gross ratings. Meaning, the number in feet-pound and RPM is not the actual performance capabilities of the lawn mower engine. That is due to the fact that the actual performance level of the lawn mower can be affected by several factors.
Those factors can include the specific type of engine used by the lawn mower manufacturer, lawn mower accessories, and the temperature and humidity levels when the product is used.
On another note, the procedures in obtaining the lawn mower ratings should be in accordance with the Society of Automotive Engineers (SAE) and Small Engine Power & Torque Rating Procedure (SEPTRP) guidelines.
However, at the present time, most companies are only using the torque rating system. That is because of the controversy about the horsepower rating system. Nevertheless, some companies still use the two rating systems.
Lawn Mower Ratings: A Comparison
The general types of lawn mowers based on the type of their engines include the gasoline or petrol lawn mower and the electrical or electric lawn mower. As their names imply, they differ when it comes to their power sources. In addition, they also differ in terms of lawn mower ratings.
Gasoline or petrol lawn mowers have horsepower ratings ranging from four to seven HP while electric lawn mowers generally have an average horsepower rating of four and below.
In addition, electric lawn mowers also have lower torque ratings as compared to gasoline-operated mowers. Hence, gasoline-powered lawn mowers better grass-cutting speed, as well as more powerful than electrical ones.
Taking that into consideration, gasoline lawn mowers are recommended for larger lawns, as well as lawns that have thick grasses. On the other hand, electric lawn mowers will be very useful for small- and medium-sized lawns that have thin grass.
Final Words on Engine Power and Torque Ratings
Mowing the grass on your lawn on weekends or during the holidays is a challenging and time-consuming task even if you have a gas- or electric-powered lawn mower. The amount of time and effort you spend will depend on how thick and long the grasses are. Likewise, it will also depend on your lawn mower’s engine power and torque ratings.
When you head to the lawn mower store, you will probably see the two types of lawn mower ratings on the user manual or on the product itself. With the concepts given above, you already know that lawn mowers with high RPMs and HPs will have better speed and power. Thus, it will be better if you will go for such products or brands.
Although the HP rating is very uncommon nowadays, there are still manufacturers that believe that the aforementioned rating system has a better meaning when used for large lawn mowers. Hence, if you intend to buy a large-sized mower, go for the ones that have either an HP rating or an HP and torque rating.