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- First Line
- JP 21 Rally NEW
The R-21 Eagle 7S is an evolution of FX 21 R-03 engine. The crankshaft is a ø14.5mm to be stiffer. Its sleeve has 7 ports and provides better performance and durability. This engine is designed for 1 / 8 On-Road. The Eagle R-7S engine has been studied to give you the best performance. Its fixed with 2 high-speed and a special main bearing.
| C. Capacity : | 3,49 cc |
|---|---|
| Bore : | 16,26 mm |
| Stroke : | 16,80 mm |
| Ports : | 7+ 2 By pass |
| Crankshaft : | ø 14,5 mm |
| Carburetor : | ø9 mm + reducer |
| Glow Plugs : | Turbo |
| Main Bearing : | Hight Speed |
| Poids : | 334 gr |
# Eagle 21 R-7S - Stock
Crankcase Stock
The Eagle 21 R-7 Stock version has endowed in crankcase at any point comparable to other FX Engine. This crankcase tested several years ago on the FX series engine, is strong and machined with high quality. The quality of crankcase has been revised for a crankshaft ø14.5mm and provide the Eagle 21 R-7 Stock a very high level of performance. The rear cover has been redesigned to reduce the dead volume of the bottom crankcase. The lowest volume increases crankcase depression and increases the speed of gas.
WARNING : Place the piston in the top dead center before removing the rear cover.
Cylinder Head
The Eagle 21 R-7S's cylinder head is endowed with 7 cooling ribs. Its shape and size are designed for optimum cooling and its getting down the center of gravity of the engine.The blue colour head is engraved R7 and JP.
Head Insert TURBO
The under head is specific to Turbo in Eagle engine and it has been tested and researched for a longtime to end optimize compression and holding glow plug in racing. Its length important entering the sleeve allows maximum tight without deformation of the sleeve. Its large insert allows an optimal cooling with the cylinder head.
WARNING : It is very important to use only a Novarossi Glow Plug for this engine. Only this Glow Plug is perfectly adapted with this insert. The use of other brands can make the engine instable and damage the insert and the piston sleeve.
7 Ports ABC Piston Sleeve
This piston sleeve has ABC 7 ports is designed to provide optimum performance. The new arrangement allows ports to optimize performance and consumption by optimizing the gas flow. The piston is CNC machined in a highly charged alloy silicon. The piston is endowed with 2 holes to cool the upper part of the engine. The conrod is R7 type is the last generation conrod is lightened with 2 bushings.
Crankshaft TURBO
The crankshaft of the Eagle 21 R-7S is increased to 14.5 mmis to be stiffer. The shaft is machined to increase acceleration and reduce fuel consumption. The HardBlack coating on crankshaft avoids the problems of friction and wearing. Like all the Eagle line, the crankshaft is HardBlack coated, a red putty, used for over 20 years on JP Racing engines, is placed in designed hole to improve gas flow. The diameter of the crankshaft for the same reasons.
Carburetor 9mm
The 9mm carburetor has an aluminum body to receive interchangeable reducer. This carburetor comes with a 8.5 mm reducer. As on all JP Engines the idle setting is limited on a single screw to adjust even easier and user friendly. This carburetor has already proved its worth and confer with this engine a great stability setting and excellent performance.