Ultimate Racing MTS Engine
Ultimate Racing MTS Engine
Ultimate Racing MTS Ceramic Competition Engine is a 3 port .21 Off-Road racing engine. Made by the prestigious Japanese O.S. Engines brand and based on their long stroke Spec II configuration, the MTS features a DLC coated crankshaft with two balanced tungsten, modified backplate, and 21J3 carburetor to improve performance. The MTS is a great choice for use in nitro truggy applications and nitro buggy when maximum power is needed. The MTS provides amazing power and great fuel consumption, with exceptional low to mid-range torque and a great idling.
The "Team Edition" concept uses the standard Ultimate Racing Ceramic Competition Engines, but the engines are assembled directly in our factory, completely broken-in and then thoroughly checked by our competition team to extract 100% of the performance. There are many manufacturers that offer pre-break-in services performed on benches with propellers. The problem is that this method only works as a pre-break-in. It is still necessary to continue breaking in the engine on the track. At Ultimate Racing we wanted to go a step further and offer our customers the possibility of purchasing fully broken-in and ready-to-race engines without the need for any additional break-in on track, i.e. engines that can be used in the most demanding competitions as you receive them, directly from the box. To ensure quality and that all "Team Edition" engines are broken-in exactly the same, we have evolved a fully monitored break-in bench where temperature, RPM and break-in time are controlled at all times. The whole break-in process is performed with the engine perfectly lubricated to minimize the loads and wear of all the parts, significantly increasing its useful life. During each of the break-in stages the engine's resistance torque is also controlled. Using this parameter, we know when the engine break-in is finished, ensuring that all of our “Team Edition” engines are perfectly broken-in and ready to compete. Once the break-in process has completed, the engines are dismantled, checked piece by piece and assembled again by our competition team, thus ensuring the highest quality of product reaches our customers.
The cooling head has been redesigned by Modelix. It’s a low profile and light cooling head that keeps a lower center of gravity improving its performance on high temperatures.
The MTS comes with the 21 J3 carburetor. Compared to the original OS 21 J3 carb, its high-speed needle holder was redesigned for a better refrigeration of the fuel flow into the carburetor, lowering the temp of the carb, and consequently it’s more stable with a great idle stability, improves fuel mileage and overall engine performance. Besides this, the uniball joint of the carb slide was also modified with two stoppers instead of one. With this new modified design, you can easily adjust the angle of the uniball joint without having to remove the engine. This carb offers a higher accuracy tuning, a very interesting advantage to experienced drivers.
The MTS backplate has been modified. The backplate is CNC machined and made of 7075-T6 Swiss Aluminum. It’s been milled to improve the gas flow going to the piston and improving engine efficiency and performance.
Thanks to its design, you can remove the backplate without damaging the conrod even when it is on its lower position (PMI). The lateral grooves allow to easily remove the backplate without having to use any tool that can damage it.
The crankshaft of the MTS is an evolution of the DLC B2102 but with two balanced tungsten in order to increase the inertia to rotation.
The MTS comes with the original OS Ceramic bearing in the rear and steel in the front.
The engine is supplied with a 6.5mm aluminum venturi.
SLEEVE AND PISTON
The sleeve with 3 inlet port and an exhaust port guarantee a low fuel consumption with a very high but smooth and linear power. Both, the sleeve and piston are made from a high strength aluminum bar to improve its durability.
Displacement: 3,49 cc
Power Output: 2.61 hp @ 34,000 rpm
Practical Range RPM: 4,000 - 42,000 rpm
Bore x Stroke: 16,27x16,80mm
Sleeve: 3 + 1 ports
Rear Ball Bearing: ceramic
Front Ball Bearing: steel
Crankshaft: 14 mm
Carburetor: 21 J3
Glow plug: P3 Turbo
Exhaust Position: rear