BONITO.21-7XLB


   Displacement: 3,49 cc
   R.P.M. (max power): 36.300 RPM
   Practical range: 6.000-40.700 R.P.M.
   Bore x stroke: 15,88x17,60 mm
   Sleeve: 7 ports
   Rear ball bearings: steel
   Front ball bearings: steel
   Crankshaft: 14,5 mm - turbo
   Carburetor: plastic - 9 mm - slide
   Glowplug: Turbo (C6TGC)
   Exhaust position: rear
   Starting: -
   Weight: 363 g
   Fuel type: 25% nitro
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carburetor-setting
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Only available with rear and front steel ball bearings (Bonito.21-7XLB/A)


FEATURES

02663   08567-11   15068   21000-2
Coolinghead:
This a 'Lighter&Lower evolution 2' type of cooling head. It is drilled and milled out to reduce the mass of the coolinghead which sits high up in the car and thereby lowering the Center of Gravity of the engine/car.
  Sleeve:
The sleeve has 7 transfer ports and an exhaust with booster ports. The special shape and positioning of the ports, covered by a patent, improve the internal fluid-dynamics to obtain the maximum possible performance.
  Crankshaft:
The crankshaft has a special shape to reduce turbulences inside the crankcase. The front part was extended to improve the seal against fuel leaking.
  Gasket:
The inner shape of the gasket has a new shape, and with that more material. Together with a change in material these gaskets are more resistant to high temperatures.
             
biella-R7   13021   16002   24063
Conrod:
The R7 conrod is made from a superlight alluminium which has been checked ultrasonic. The specific form of the R7 creates little turbulence inside the engine while running.
  Rear cover:
The rear cover presents a round shape to optimize the filling and reducing the dead spaces. the steel plate is to reduce friction and to expand the lifespan of the conrod.
  Rear ball bearing:
The rear ball bearing has high quality ceramic balls to minimize wear and inertia to improve acceleration and fuel consumption.
  Carburettor:
The carburettor of this engine is made from plastic and in "reverse" style and has a sliding throttle valve.

 

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