What are Briggs 5hp engine specs?

Answer 1

Engine Size

• The Briggs & Stratton Raptor engine features a bore between 2.56125 and 2.5625 inches and a stroke of 2.438 inches. This corresponds to a total engine displacement of 12.48 cubic inches per engine cycle.

  More modern Briggs & Stratton 5 horsepower engines feature the same 12.48 cubic inches of engine displacement, but achieve that volume of displacement using a wider bore and a shorter stroke. The currently produced Animal, 206 and World Formula engines feature a bore between 2.6875 and 2.6885 inches and a stroke of 2.2 inches.

Compression Ratio

• The original Raptor series of engines featured a compression ratio -- the ratio of the length of the stroke to the length of the combustion chamber -- of 6.5 to 1. Despite their shorter strokes, modern Briggs & Stratton engines also feature shorter combustion chambers and thus have higher compression ratios. The World Formula has a compression ratio of 9.5 to 1, the 206 has a compression ratio of 9 to 1, and the Animal has a compression ratio of 8.5 to 1.

Ignition Timing

• The factory-specified optimal ignition timing for the Raptor engine is 22 degrees before top of dead center (BTDC). The Animal, 206 and World Formula engines are factory-designed for an ignition timing of 29 degrees BTDC.

Aftermarket Modifications

• Many users modify their Briggs & Stratton racing engines to improve on, or the stretch the limits of, engine performance. If you purchase a used Briggs & Stratton motor, ask the seller about any modifications that have been performed and how they may affect engine performance.

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