Mercedes-Benz W25 

  • built in Germany
  • 1934
  • 354 HP 3.4L
  • 186 mph
The suspension setup warranted the need for hydraulic brakes, as the required linkage would be too complicated for mechanical drums.
The transmission was flanged onto the differential (transaxle design) to improve the distribution of the axle loads.

Road Tests Real world tests of the Mercedes-Benz W25

Top speed

Mercedes-Benz W25
186 mph
253 mph
GT 86
140 mph

Data points Key details of the Mercedes-Benz W25


Mercedes-Benz W25
354 HP
987 HP

Engine size

Mercedes-Benz W25
3,360 cc
7,993 cc
Corvette Z06
7,011 cc

In The News From around the web


Mercedes-Benz W25
The Mercedes-Benz technicians had envisaged 280 hp (206 kW) for the initial M 25 A, extrapolating the 85 hp (63 kW) per litre of the supercharged 1924 two-litre M 2 L 8 engine with which Rudolf Caracciola had won the 1926 German Grand Prix on the Avus, and arriving at a theoretical capacity of 3360 cc for the new engine.
The car stood out as being very unique for the period as it had hydraulically operated brakes to work with the independent front and rear suspensions.

Specifications Full list of technical specs


Brand Mercedes-Benz
Type of car Race car
Year 1934

power & handling

Power-to-weight ratio 5.27 lb/hp
Maximum hp 354 HP @ 5,800 RPM
Max RPM 5,800 RPM
Steering system Rack and pinion


Displacement 3,360 cc
Fuels Gas
Compression ratio 7.5:1
Bore/stroke 3.07 in / 3.46 in
Valvetrain DOHC

road tests

Top speed 186 mph


Gearing Traditional
# of gears 4 gears
Gear ratios
  1. 1: 2:1
  2. 2: 1.37:1
  3. 3: 1.14:1
  4. 4: 1:1
  5. 5: 0.8:1
Axle ratio 4.44:1

suspension, wheels & brakes

Front brakes Disc
Rear brakes Disc

physical dimensions

Curb weight 1,867 lb
Width 69.7 in
Height 45.7 in
Length 159.1 in
Front track width 58 in
Wheelbase 107.3 in
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