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The SH .21 XB Pro Competition Off-Road engine is designed specifically for 1/8th scale off-road racing. It features competition-grade aluminum-alloy parts, a ceramic piston with 8-port chrome-plated brass sleeve, dual ball bearing-supported crankshaft, three-needle slide carburetor with 7.5mm and 8.5mm intake restrictors, heat-dissipating cylinder head and superb attention to detail and quality.
All SH engines are created using CNC manufacturing equipment to ensure every engine is produced to the exacting quality that you expect from an engine of this caliber. SH engines offer the best in reliability, power and cost.
Specifications:
Displacement: 3.497cc
Bore: 16.27mm
Stroke: 16.75mm
Maximum RPM: 38,000 rpm
Power: 2.8hp @ 38,000 rpm
Weight: 464gr
Features:
Ceramic Piston with 8-Port Chrome-Plated Brass Sleeve
Dual Ball Bearing-Supported Crankshaft
Dual Bushing-Supported Connecting Rod
Three-Needle Slide Carburetor
Heat-Dissipating Cylinder Head
7.5mm and 8.5mm Carburetor Intake Restrictors
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More Information About the 21 Pro Buggy Engine, 8-Port Ceramic Piston
Fuel Recommendation:
For the break-in period you should use a fuel specifically designed for R/C car engines that contains no more than 20% nitromethane and 10%-14% oil content. Once the engine has been adequately broken in (about 45-60 minutes of run-time) you can switch to an R/C car fuel containing up to, but no more than, 30% nitromethane and 10%-14% oil content. We recommend using XTM Racing or Trinity Monster Horsepower fuel.
Glow Plug Recommendation:
The glow plug can make a big difference in how your engine performs. For both the break-in period and normal use, we recommend using a "cold" or "medium" heat-range glow plug intended specifically for performance engines like the SH #5 or the SH #4. After the break-in period you may want to use a different heat-range glow plug. If the engine has a hard time idling, you may want to use a hotter glow plug, like the SH #3.