VIR-TUS.21


   Displacement: 3,49 cc
   R.P.M. (max power): 41.000 RPM
   RPractical range: 6.000-46.800 R.P.M.
   Bore x stroke: 15,88x17,60 mm
   Sleeve: 9 ports
   Rear ball bearings: steel
   Front ball bearings: steel
   Crankshaft: 14,5 mm - tuned - turbo
   Carburetor: aluminium - 9 mm - slide
   Glowplug: Turbo (C8TGH)
   Exhaust position: rear
   Starting: -
   Weight: 336 g
   Fuel type: 25% nitro
download-exploded-view
carburetor-setting
instruction-manual

Available versions:
front and rear ceramic ball bearings (VIR-TUS.21/S)
front and rear steel ball baerings (VIR-TUS.21/A)


FEATURES

new-position-carb   16607   02154V   85024-T
Patented:
The shifted carburetor grants a better mixture flow inside through the crankase's intake. This gives the engine an improved fuel efficiency and a better power curve.
  Rear ball bearings:
The new ball bearing reduces the inertia of the rotating masses and increases the engine's scavenging. You can see both the ball bearing and the manufacturing process result in the picture above. These novelties give an increased throttle response and a higer top speed.
  Coolinghead:
This a 'Lighter&Lower evolution 3' 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. The use of 6 screws instead of 4 ensures a better sealing between sleeve, botton head and the crankcase.
  Crankshaft:
The new crankshaft gives the engine a better balancing. This will reduce the vibration produced by the rotating and the alternating masses.
08593   13021   biella-R7   21000-2
Sleeve:
The sleeve has 9 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.
  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.
  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.
  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.

 

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