Mazda Cosmo | Unique Cars and Parts

16 Jan 2015 | Author: | Comments Off on Mazda Cosmo | Unique Cars and Parts
Mazda Cosmo

Mazda Cosmo

The Cosmo was Mazda’s rather futuristic car and was designed from the ground up. It was perceived as Mazda’s first foray into the world of high-performing excitement machines. In most aspects the 110 S was a conventional and stylish sportscar designed to compete alongside the Porsche 911 and the Jaguar E-Type.

Its capacity equalled about two litres with an output of 110 bhp at 7,000 rpm.

Top speed was 186 km/h and it could reach 0 – 96 in around 10 seconds. It handled terrifically with its DeDion axle at the rear and wishbones at the front. Its braking power relied on discs at the front with drums at the rear.

In its five year production span the Cosmo basically stayed the same, other than a closer-ratio five-speed gearbox, longer wheel base and slightly increased power.

Development Of The Wankel Rotary

Using the then latest aids to engineering research and development, Toyo Kogyo Co. Ltd. developed their Wankel rotary combustion engine. in parallel with other licensees, to the production stage in barely six years.

Indeed, the twin rotor Wankel RC engine as fitted to the Mazda Cosmo was the first twin-rotor RC engine to go into production, though NSU. Curtiss-Wright and others did have twin and multi-rotor RC engines in advanced stages of development.

Toyo Kogyo research was focused on improving engine durability and reliability; they made exhaustive studies and comparative evaluations of peripheral versus side inlet ports for single, twin, three and even four-rotor engines, besides investigating the effects of single and dual ignition systems on combustion phenomena.

A formidable 1.87 million road test miles were covered during the development of the Mazda Cosmo and its engine to production standards, and during 1966 numerous cars were in the hands of Mazda dealers and other experts throughout Japan for final evaluuation. Their cogent observations were examined, and wherever possible any ideas which emerged were incorporated in the final version.

Mazda Cosmo

A Conventional Sports Car Formula Mated To Rotary Genius

The silhouette of the Mazda Cosmo was rather conventional, although very good looking. The frort mounted engine sat behind the front axle, which in turn drove the rear wheels through a four-speed and reverse all-synchromesh type gearbox, an open propeller shaft and a hypoid final drive. This hypoid final drive made up part of a de Dion rear axle arrangement, which also incorporated’ half-elliptic springs.

Independent front suspension was by unequal-length wishbones and coil springs. Double acting teleescopic hydraulic dampers were used all round, and there were Dunlop front disc brakes and leading/trailing shoe rear drums.

On the Mazda Cosmo‘s release in May 1966 all interest was naturally focused on detail engine features and performance characteristics, all of which quickly proved that there was (and remains) a keen appreciation of RC engine peculiarities at Toyo Kogyo. The displacement per shaft revolution was 2 X 491 cc. which made the engine equvalent to a 1,964 cc. four-stroke reciproocating piston engine. The compresssion ratio was 9.4 to 1 and maxiimum power output was 108.5 bhp at 7,000 r.p.m. with maxiimum torque of 96.2 lb. ft. @ 3,500 r.p.m.

Two-Stage Carburettor Ensures Near Perfect Low Speed Top Gear Flexibility

A four-barrel two-stage Stromberg carburettor was matched to the engine, the main feature of which were the double inlet ports into each chamber. The primary inlet ports, each 1.108 sq. in. effective cross-sectional area, were provided to operate at the lower load and speed range, whilst the primary and secondary inlet ports – 2.217 sq. in. – become operative as load and speed rose.

Mazda Cosmo
Mazda Cosmo
Mazda Cosmo
Mazda Cosmo
Mazda Cosmo
Mazda Cosmo
Mazda Cosmo
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