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Untitled document This is a EBMods JS Racing "TX-521R" Fully Modified .21 Nitro Engine. The JS TX-521R was designed by Ed Bridges of EB Mods with JS Racing. Ed Bridges was able to produce a high horsepower, fuel efficient, and durable engine. The EB Mod's JS TX-521R Fully Modified Engine has been blueprinted, and hand assembled by Ed, to guarantee a precision fit with all the parts, to provide the best performance and longest life. The JS TX-521R Full mod is broken in, and dyno tuned by Ed to ensure that every engine meets the performance requirements - Connecting Rod: The rod is milled to reduce weight, and then treated to strengthen and eliminate any machining stresses.
- Piston: The piston is lightened on a Milling Machine while maintaining strength.
- Crankshaft: The Crank has undergone extensive R&D testing with different ratios of balance between the Crankshaft, Piston, and Rod assembly. All this testing has helped develop a lighter crankshaft, with improved balance, while keeping proper crankshaft inertia for a smoother idle.
- Port Timing: The timing has been adjusted to offer a more linear feel across the bottom-end with a noticeable increase in the Mid and Upper RPM power. The usable rpm range is increased to 45,000rpm, compared to the stock 40,000rpm range.
- Crankshaft: The Crank has been Titanium Nitride coated (TiN) to reduce friction and increase engine life. The crank is then bored and filled with silicone to reduce rotating weight, while maintaining proper crankshaft balance for quick acceleration and smooth idle.
Features:
- Hand Matched piston and sleeve
- Optimized sleeve timing and port design for increased run time
- Re-enforced case for better concentric mating during thermal expansion and contraction
- Knife edged long con rod, for a broad power curve
- 14mm TiN Coated Crankshaft, for reduced friction and long life
- Flow tested 2 Needle slide carburetor w/6.5, 7, and 8mm inserts included
- Ceramic rear bearing for reduced friction and vibration
- Cross drilled cooling head for reduced weight and increased cooling
- Blueprinted
- Broken-In
- Dyno Tuned
Specifications:
Displacement: .21c.i./3.49cc
Bore: .6405"/16.26mm
Stroke: .6615"/16.8mm
Sleeve: Chrome Plated Brass
Porting intake: 5 port + 2
Porting exhaust: Single Optimized
Crankshaft: 14mm
Rear Bearing: Ceramic
Carburetor: Composite Two Needle w/Adjustable Venturi
Usable RPM Range: 45,000rpm
Recommended Pipes: Novarossi pipe #NOV51004, and manifold #NOV41021 Recommended Plugs using EBMods Race Fuel: - OS P3: High Humidity Days / Outside Ambient Temp Range 50*-70*
- OS P4: Hot and Low Humidity Days / or High Altitude Racing / Outside Ambient Temp Range 70*-100*
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