FF-320

The only ringed piston, "flat four" R/C engine available

• Twin opposing cylinder design self dampens most vibration smooths operation for longer engine and airframe life and minimizes vibration related damage to radio gear
• Features pushrod overhead valves, seven ball bearings, propeller Lock Nut assembly and firewall mount

Stock Number: OSMG1320
Displacement: 0.809 cu in (13.3 cc) x 4
Bore: 1.091 in (28 mm)
Stroke: 0.866 in (22 mm)
Practical rpm: 1,800-8,500
Output: 4.1 hp @ 8,000 rpm
Weight: 77.3 oz (2,190 g)
Includes: glow plugs; mount
Requires: fuel; prop
Recommended Props: 18x10, 18x11, 18x12, 18x13, 18x14, 20x8, 20x9, 20x10, 22x8

Power your prized Giant scale plane with an O.S. Multi-Cylinder 4-Stroke    
Engine. The O.S. FF-320 (Nicknamed "Pegasus") is a Flat-Four Cylinder Engine. 
It is the ultimate in scale realism: abundant power, realistic noise levels,  
and scale appearance. This engine is covered by a 2-Year Warranty.            
                                                                              
                                                                              
FEATURES: Pushrod-Driven Overhead Valves                                      
          Ringed Pistons                                                      
          Gear-Driven Camshaft                                                
          5 -Crankshaft Ball Bearings                                         
          2 -Camshaft Ball Bearings                                           
          Four Cylinders (flat, 2 opposing 2)   Firing Order: 1-3-2-4         
                                                                              
INCLUDES: One Assembled FF-320 4-stroke Engine                                
          One Set of Instructions, Decals, and Poster                         
          One Choke Valve                                                     
          Four Glow Plugs (OSMG2692)                                          
          One Motor Mount (OSMG2804)                                          
          One Safety Prop Nut Assembly                                        
          One Glow Plug Extension Harness                                     
          One Spare Woodruff Key                                              
                                                                              
SPECS:    Construction: All aluminum and Aluminum alloys                      
          Displacement: 13.26 cc (x4) (.809 cu in x4)                         
          Bore:   27.7mm (1.091")                                             
          Stroke: 22.0mm (.866")                                              
          Power Output: 4.1 BHP at 8,000 RPM                                  
          Weight: 2,190g (77.3oz) w/mount                                     
          Practical RPM Range: 1,800 - 8,500 RPM                              
          Length: 181.5mm (7.15") from back of mount to front of drive washer 
          Width: 196mm (7.72")                                                
          Height: 80mm (3.15") from top of mount to bottom of mount.          
                                 the carb extends 30-40mm farther down.       
          Distance from front-most edge of front header to drive washer: 36mm 
          Crankshaft Thread size: 5/16-24                                     
          Suggested Props: 18x10, 18x11, 18x12, 18x13, 18x14, 20x8, 20x9,     
                                                                   20x10, 22x8
          Needle Settings: High Speed: 3-3.5 turns out from fully closed      
                           Mixture Control (low speed): Turn counter-clockwise
                                       until it stops, then 2 turns out