55AX  | Specification:
- Displacement: 0.545 cu in (9 cc)
- Bore: 0.91 in (23 mm)
- Stroke: 0.85 in (21.5 mm)
- Practical rpm:2,000-17,000
- Output: 1.75 hp @ 16,000 rpm
- Weight: 14.3 oz (404 g)
- Includes: #8 glow plug, 40J carburetor, Power Box E-3070 muffler
- Recommended Props: 12x7, 12x8, 13x6, 13x7 | More muscle for .40 sized airplanes.Increase displacement in your 40-size model the easy way: just drop in a 55AX engine! You'll enjoy more horsepower for swinging bigger props — which means improved 3D, precision and sport flying. Best of all, there's no modifications required! - Mounts directly into the bolt pattern for a 46AX.
- A diagonally-placed needle eliminates the need for a remote needle valve.
- The 5-sided, angular head design looks great and significantly increases surface area for better cooling.
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 ABL (Advanced Bimetallic Liner) uses two O.S.-developed alloys to provide a durable barrier between the brass liner and piston. |  The Power BoxTM muffler has a generous sized chamber and larger sound baffle to significantly reduce exhaust noise without stealing power. |
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Engines 
