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Novarossi Keep-On .21 Engine 9 Port Turbo XLong Stroke

Novarossi Keep-On .21 Engine 9 Port Turbo XLong Stroke

Your Price:$190.00
Retail Price:$445.99
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Part Number:NVRKEEPON21/A

This a Lighter & Lower evolution 2' type of cooling head. It is drilled and milled out to reduce the mass of the cooling head which sits high up in the car and thereby lowering the Center of Gravity of the engine/car.

The R7 conrod is made from a super light aluminum 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.

Compression rings:
The ignition timing is controlled with these little rings of various thickness. To change the ignition timing you can add or remove a ring of a certain thickness.

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 ball bearing:
The new ball bearing reduces the inertia of the rotating masses and increases the engines scavenging. You can see both the ball bearing and the manufacturing process result in the picture. These novelties give an increased throttle response and a higer top speed.

The crankshaft is ground to increase the mixture flow and has a special shape to reduce turbulence inside the crankcase. The balancing is done by 3 inserts made of tungsten alloy and the inlet has a silicon filling to reduce the weight of the crankshaft to improve acceleration.


  • Displacement: 3,49 cc
  • R.P.M. (max power): 40.100 RPM
  • RPM practical 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

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