The following chart (PDF version) is a simplified view of the new engine labeling system. The engine series number describes the minimum torque value for a particular engine family. For example, the 400 Series listed below makes at least 4.0 ft. lbs. of torque, the 500 Series, 5.0 ft. lbs., etc.
Small Horizontal Shaft Engines
400 & 500 Series - Model 90000 (L-Head)
800 & 900 Series - Model 120000 (OHV)
1100 Series - Model 150000 (OHV)
1300 & 1400 Series - Model 200000 (OHV)
1500 Series - Model 210000 (OHV)
The same information listed for small vertical shaft engines applies to small horizontal shaft models through 21 cubic inches. Labels will consist of a series, displacement in cc's and gross torque output values.
Large Vertical Shaft Engines
Labels for these models will consist of a sub brand such as Power Built, I/C or Extended Life Series, etc., cc's and gross horsepower value. Since these large engines perform many tasks besides simply turning a lawnmower blade, horsepower is maintained as a measure of engine power.
For related information regarding our engine torque rating, please visit our What is the horsepower or torque rating of my engine? FAQ
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society of Automotive Engineers) code J1940 (Small Engine Power & Torque Rating Procedure), and rating performance has been obtained and corrected in accordance with SAE J1995 (Revision 2002-05). Torque values are derived at 3060 RPM; horsepower values are derived at 3600 RPM. Actual gross engine power will be lower and is affected by, among other things, ambient operating conditions and engine-to-engine variability. Given both the wide array of products on which engines are placed and the variety of environmental issues applicable to operating the equipment, the gas engine will not develop the rated gross power when used in a given piece of power equipment (actual "on-site" or net horsepower). This difference is due to a variety of factors including, but not limited to, accessories (air cleaner, exhaust, charging, cooling, carburetor, fuel pump, etc.), application limitations, ambient operating conditions (temperature, humidity, altitude), and engine-to-engine variability. Due to manufacturing and capacity limitations, Briggs & Stratton may substitute an engine of higher rated power for this Series engine.