NSU Sportmax and Racing
NSU Sportmax and Racing | |
Manufacturer | |
---|---|
Production | 1954 - 56 |
Engine | Single cylinder, 4 stroke, OHC |
Compression ratio | 7.4:1 |
Top Speed | 212 km/h / 131.7+ mph |
Ignition | Coil |
Transmission | Four speed block |
Frame | Single-bar stamped plate with engine protection and suspended |
Suspension | Front: Swining link suspension Rear: Telescopic suspension |
Weight | 155 kg / 342 lbs (wet) |
Manuals | Service Manual |
It could reach a top speed of 212 km/h / 131.7+ mph.
Engine[edit | edit source]
The engine was a Air/Oil cooled cooled Single cylinder, 4 stroke, OHC. The engine featured a 7.4:1 compression ratio.
Drive[edit | edit source]
Power was moderated via the Multi-plate.
Chassis[edit | edit source]
The front suspension was a Swining link suspension while the rear was equipped with a Telescopic suspension.
Photos[edit | edit source]
Overview[edit | edit source]
NSU 250 Sportmax
The NSU Sportmax is a racing motorcycle for private riders that was developed from the standard machine. It successfully raced alongside the factory Racemax machines from as far back as 1953. The whale cladding with ears was replicated many times by private persons, a practice that was tolerated by NSU provided it was not painted blue. In 1955, H.P. Müller riding the Sportmax became the world's first private rider to become world champion in the 250 cc class.1958 NSU. "SPORTMAX". Although N.S.U. had been so successful with their "works" racers in both the 125 and 250 c.c. classes, the machine they used was far too specialized ever to be a practical proposition for a private owner to maintain. However, the factory did realize that they would gain valuable publicity by some private owners racing their products and accordingly they released a few "Sportmax" models. These machines were based on the standard production "250s", the "Max" and "Super Max", and in the years following the factory's sale of real racers there were a good many private-owner conversions of the roadsters into pseudo-racers. They didn't go as quick!
The cycle parts of the "Super Max" were
very similar indeed to those of the "works" twins, with a spine-type frame
made from a pair of deep pressings placed back to back and welded along
their edges, a method of frame making that has been extensively used by
European factories, especially for ultra-lightweights and mo-peds. Pressings
welded together were also used for the rear swinging-fork and for the front
fork main members.
Alloy rims were employed and the hubs
were altogether more massive than the roadster pattern.
Surprisingly, the engine, at any rate externally, did not differ in any
major way from "standard". The operation of the overhead camshaft was by
means of rods and eccentrics.
A pair of rods, rather like connecting
rods with a "big-end" at each end, fitted over eccentrically mounted, thick
discs on the half-time pinion and on the end of the camshaft so that, as one
was rotated, the other had to follow suit. This method of camshaft operation
was not new, for it had been employed in the twenties on Bentley cars.
A few of the "Sportmax" machines reached England and with one, John Surtees
achieved a great number of successes before his M.V. days. With the same
model, Mike Hailwood followed in John's shoes, winning at almost every short
circuit in England during the 1958 season. Later he acquired other, faster
"250s" and the success of the N.S.U. waned.
Make Model | NSU Sportmax |
---|---|
Year | 1954 - 56 |
Engine Type | Single cylinder, 4 stroke, OHC |
Displacement | 247 cc / 15 cub in |
Bore X Stroke | 69 x 66 mm |
Cooling System | Air/Oil cooled |
Lubrication | Dry sump |
Clutch | Multi-plate |
Starting | Kick start |
Ignition | Coil |
Carburetor | BING 2/26/25 |
Exhaust System | Twin, steel |
Max Power | 20.6 kW / 28 hp @ 10 00 rpm |
Compression | 7.4:1 |
Transmission | Four speed block |
Final Drive | Chain |
Frame | Single-bar stamped plate with engine protection and suspended |
Front Suspension | Swining link suspension |
Rear Suspension | Telescopic suspension |
Brakes (front And Back) | Drum |
Wet Weight | 155 kg / 342 lbs |
Top Speed | 212 km/h / 131.7+ mph |
Source | audi.com |