Red RC » OS Engines

March 26, 2025

O.S. Speed T1205 .12 Onroad Engine

Japanese engine manufacturer O.S. Engines has released its latest .12 1:10 Onroad competition engine, the O.S. Speed T1205. Based on T1204, it features a redesigning crankshaft and revised needle taper angle. The newly designed crankshaft for improved power delivery from low to mid end performance. The revised needle taper angle has expanded the adjustment range. Using the well-received outer head shape from T1204 this gets a new laser design. Also available as a Combo set, this comes with TT03 EFRA2700 tuned silencer and the newly developed MT04 exhaust manifold.

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December 2, 2024

O.S. Speed B2105 Ongaro WC V3

To mark Davide Ongaro’s history making 3 in a row IFMAR 1:8 Offroad World Championship victory in Redovan in this year, his Japanese engine sponsor O.S. has released the O.S. Speed B2105 Ongaro WC V3. Based off the B2105 the Italian used to take his second nitro WC victory with the brand, features of this special release include the outer head being double anodised in black and gold to meet Ongaro’s request. The letters on both sides of the crankcase have special laser engraved for a shiny finish, with the “World Champion” logo also engraved on the front bearing. The reducer is a gold-plated φ6.5 II that was used in the World Championship. The TB02 tuned silencer is also a special edition with Ongaro’s signature and the “World Champion” logo.

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August 7, 2024

O.S. Speed R2106 1:8 Onroad engine

Legendary Japanese engine manufacturer O.S. Engines has released its latest .21 engine for 1:8 Onroad racing, the O.S. Speed R2106. The cylinder liner adopts a new 9-port shape, and the port shape has been revised to improve power in the mid-range. The crankshaft uses the well-known EURO2, and the combination with the rear bearing that uses ceramic balls has improved the feeling from the low-range. In addition, the connecting rod adopts a newly designed reinforced type, which improves durability in long and harsh racing scenes. The carburetor is based on the 21M, which was also well-received in the R2105, but the slide valve and needle shape have been changed to make it easier to adjust. It has been reborn as the O.S. Speed R2106, which can be expected to give you an advantage in racing.

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May 7, 2024

O.S.Speed B2105 1:8 Offroad engine

Japanese manufacturer O.S.Speed has announced the latest evolution of its World Championship winning 1:8 Offroad engine with the release of the B2105. The fifth generation of the B21 series, it is designed to produce power that gives an advantage in harsh offroad racing scenes, and pursues a driving feel that steadily demonstrates performance in any situation. By re-designing the cylinder liner and crankshaft, they have achieved smooth and linear power delivery. The newly designed 3 port cylinder and liner features new port shape and the air-fuel mixture flow has been reviewed to achieve more torque from mid to high end. The modified crankshaft has undergone O.S.Speed’s traditional DLC coating and the internal shape has been revised to improve not only power characteristics but also easier to use than B2104. Additionally, the effect of a lighter outer head successfully improves drivability of the B2105.

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April 16, 2024

O.S. Speed TR03 & MR04 1:8 Onroad Exhaust Set

Japanese engine manufacturer O.S has released a new TR03 (EFRA2196) exhaust for 1:8 Onroad use. It has been designed to give powerful characteristics at the mid-speed range after reviewing the internal shape of the current TR02 (EFRA2165) exhaust. A special coating applied to the surface also plays a part in this improved area of performance. Additionally, the engine sound that can be noticed from the moment the engine starts. Also released is the new MR04 manifold that can also be purchased as a set with the new TR03 exhaust. This manifold has a revised shape from the current product MR03-WC, and has the characteristic of extending smoothly to the high speed range without compromising the medium speed range. Both the exhaust and manifold have a buff finish and are laser engraved for easy identification.

Source: O.S. Engines [os-engines.co.jp]

March 14, 2024

Kato joins O.S Engines

Promising Japanese onroad and offroad talent Kouki Kato has been announced as a O.S Engines supported driver for 2024. The 17-year-old Japanese driver has put in some very impressive international results recently including making the Final on his debut at the 1:8 Onroad World Championship last November, after TQ’ing the final round of qualifying, and making the A-Main at the ultra competitive TITC electric touring car race in Thailand earlier this month. The reigning Japanese 1:8 Offroad Champion, he is also the double 1:10 Offroad National Champion, and his Team Associated Offroad and Infinity Onroad nitro programmes will be powered by O.S. Speed engines and Nitro Fuel.

Source: O.S. Engines [os-engines.co.jp]

March 6, 2024

O.S. Engines MAX-B21 1:8 Offroad/GT engine

Japanese engine manufacturer O.S. has introduce their new MAX-B21 which is intended for 1:8 Offroad 1:8 GT Onroad use. The MAX-B21 is easy to use from entry-level users to sports users and has excellent cost performance. Based on the O.S.SPEED series engine, it has a well-balanced combination of smooth speed and power delivery that can be used in both onroad and offroad racing situations.  The engine head is based on MAX-21XR-B VER.3, it has been reduced weight for better performance and finish in O.S.’s trademark blue colour. Also the shape of the combustion chamber of the inner head has been revised to improve combustion efficiency and response in the low speed range.  In addition has improved stable idling and an easy to adjust carburetor.

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September 7, 2023

O.S. MAX-12TG Ver.V 1:10 Touring Car engine

Japanese engine manufacturer O.S. has released the fifth generation of their long established MAX-12TG 1:10 touring car engine line. While following user requests and trends, OS have pursued ease of use and better performance with each successive generation, and now in its fifth generation the MAX-12TG Ver.V has been improved in various parts in order to demonstrate excellent power even in regulated race scenes. The first major change in appearance is the addition of one cooling fin to the bottom of the outer head. This improves engine cooling performance and enables stable performance. Also, by increasing the lightweight holes in the fins, the weight increase due to adding one fin is reduced. Furthermore, the head has a new laser design, making you aware that it is “Ver.V”. Another point that cannot be overlooked is the improved idling performance due to changes in crankshaft timing and improved carburetor. The shape of the combustion chamber in the inner head has been changed to improve combustion efficiency and increase torque in the mid-speed range.

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