Engine details
Prestwich Model Boats
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CMB 21 LS.21 longstroke greenhead.

  Technical details

Displacement (cc) 3.48
Bore (mm) 16.30
Stroke  (mm) 16.70

 

 
Cooling Green water-cooled head
Carb Barrel type carb 8.5mm bore .
Cylinder 1-Exhaust, 4-transfers, 1-boost, 2 piston bypass ports.
Induction  Drum valve  
Glow plug Cone plugsl  (TURBO)      
Head shims (mm) 0.1
Extra CMB Multi-Exhaust-System 2 ports + special tapered piston and top
Crankshaft 13 mm 
Main bearings  1 x 6000, 1 x 607
Recommended fuel 20% nitro
17% oil, 2% castor, the rest synthetic.
Recommended pipe length mm for gear drive. 185mm 
 
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