Red RC » OS Engines

March 1, 2015

O.S. Speed Tuned B2101 Ty Tessmann Edition engine

Ty Tessmann tore up the track at the 2014 IFMAR 1/8 Scale Off-Road World Championships running an O.S. Speed Tuned B2101 engine tailored to his winning specs. Now O.S. makes that same setup available to other drivers — in the Ty Tessmann Limited Edition Speed Tuned B2101. The engine features the same tuned pipe, manifold and carb restrictor used by Ty to win the 2014 IFMAR Championships. Its T-2090SC pipe is paired with an M2002SC manifold whose added length increases torque in the low to middle range. The 5.8mm restrictor — not available on any other O.S. engine — matches what O.S. supplied to Ty for extending run time in competition. Like the standard B2101, this version has a lowered cylinder head, DLC crankshaft with balanced tungsten weights, and a Type 21J carburettor. Only a small number are being produced, making this engine both competitive and collectible. The Ty Tessmann Limited Edition Speed Tuned B2101 is easy to distinguish from the standard model due to the natural-colour cylinder head and Ty’s name laser-etched onto the crankcase, crankshaft and tuned pipe.

Click here to view the specifications

September 14, 2014

O.S. Speed T1201 2.1cc nitro engine

Following the Speed B2101 buggy engine O.S. also release first information a new Speed line engine for the 1/10th 200mm class. The T1201 uses the experience gained with the Speed 12XZ Spec.III engine and basically is a completely new design that features improved fuel efficiency and an optimised torque curve. Furthermore the long stroke engine comes with an improved carburettor and a new low centre of gravity cooling head. The engine is set for a release in October.

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

September 12, 2014

O.S. Speed B2101 buggy nitro engine

Japanese company O.S. introduce their latest competition buggy engine in the form of the B2101. Based on the experience gained with the 21XZ series the square bore/stroke engine is of a new design that allows for a more controllable bottom to mid range power, resulting in improved vehicle control. The B2101 makes use of a new crankshaft that comes with a special coating and it is tungsten balanced while a redesigned cooling head lowers the centre of gravity. The motor will not replace O.S.’s Speed 21XZ-B Spec.II as this will still be available for all drivers who seek the ultimate in bottom end power. The B2101 is set for an October release following the World Championships in Sicily.

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

February 28, 2014

O.S. 21XZ-B VII buggy engine

New from O.S. comes the 21XZ-B VII competition buggy engine. Sharing the same liner, piston and conrod as the Speed version the engine’s output is comparable to the Speed Spec II but the price tag is more aimed towards the regional and national level racer. The engine features a 22B2 single needle carburettor with 7mm venturi insert, a silicone-filled crankshaft with tungsten counter weights and a blue anodised low-profile cooling head with lightening holes for reduced weight.

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February 8, 2014

O.S. R2101 8S low-profile cooling head

O.S. Engine introduce the 8S low-profile cooling head for the R2101 on-road engine. Being of a shorter design with only 8 ribs the cooling head makes for faster engine heat-up and less temperature loss at speed in cold ambient temperatures. The part is a direct replacement for the engine’s stock cooling head.

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

September 29, 2013

O.S. Speed R2101 .21 on-road engine

O.S. Engine introduce the O.S. Speed R2101 .21 on-road engine. Building on the winning heritage of the 21ZX-R the newly developed engine is of a 7+3 port design, and comes with a redesigned liner and piston for improved fuel economy, a new crankshaft and a new cooling head. A pre-production version of the engine was used by Mugen’s Takaaki Shimo to win the Pre-Worlds race back in May with the actual production engine will be used by the O.S. team at the upcoming Worlds next month.

Click here to view the specifications

May 2, 2012

O.S. Engine 12TG VII(P) engine

New from O.S. Engine comes the 12TG VII(P). Featuring a new two-piece head, slide valve carburettor and ROAR-legal rear exhaust design the .12 engine is designed for competition level stadium trucks and the like.

Click here to view the specifications

July 31, 2011

O.S. 21XZ-R Speed & 21XZ-R VII engines

O.S. have introduced two new 21XZ-R engines for 1/8 scale on-road racing with both featuring superb runtime. Engineered for added horsepower and faster lap times, the 21XZ-R Speed performed well at the 1/8 Scale On-Road Worlds in Miami, Florida with Team drivers coming home in 4th and 5th place with production models. The motor features a redesigned crankcase and carb to produce smoother transitions and higher speeds while the 21M slide-valve carb features 4 adjustable control settings, including a low-end metering needle for improved torque and fuel economy. A more-balanced conrod reduces vibration and wear. Equipped with many of the same performance features as the .21XZ-R Speed ABC, the 21XZ-R VII offers explosive acceleration and top-end for race-winning potential at a more economical price. It combines aggressive timing with easy starting so drivers can unleash its race-winning potential right out of the box, while the cylinder liner boasts 7 scavenger ports and three exhaust ports. Both engines are available in early August.

View the full engine specs here