Briggs & Stratton Raptor

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The Briggs & Stratton Raptor series is a long-running line of single-cylinder, four-cycle flathead engines that has been in use since the early 1970s.

Contents 1 Specifications 1.1 Raptor I 1.2 Raptor II 1.3 Raptor III 1.4 Production counterparts 2 External links

[edit] Specifications

[edit] Raptor I

The Briggs Raptor 1 was a three-horsepower single plate clutch, a design shared by the other two Raptors. The stock options were an aluminum block with .010-bore pistons, making this setup a good choice for beginners due to its slow acceleration and low top speed. However, a top-of-the-line options package would include an I/C Steel Sleeve Ball Bearing block with I/C Steel .030-bore pistons, bringing the overall horsepower up to four.

[edit] Raptor II

The second Raptor, released in the 1980s, saw an upgrade to four horsepower standard. This would be the year that Briggs introduced the aluminum-bore dual-bearing block. It had a cast-aluminum connecting rod that decreased internal mass and improved engine life.

[edit] Raptor III

Released in 1995, the third and final Raptor, the Raptor III, had five horsepower. The only thing different from the II was that this one had a cast-alloy crank with a carbon-infused piston. This engine sold phenomenally, however, and almost fazed out its two predecessors. Hundreds of thousands of these engines remain in service today, and are the best-selling racing engine of all time.

[edit] Production counterparts

All Briggs flatheads since the introduction of the II have been designed after the racing engine, most notably the I/C. However these engines have none of the racing parts.

[edit] External links

• [1] A Briggs Raptor III.