The Complete Guide to Classic Datsun Cars and Trucks

1951 Datsun DB-4 Model

 The Datsun DB-4 was a four door sedan that replaced the two door Datsun DB-2 in 1951. No DB-3 model was built, the numbering system instead went from the DB-2 straight to the DB-4. The DB-2 was a 2 door and the DB-4 is a 4 door, but the model naming has nothing to do with the number of doors they had as they followed this car with the DB-5 and DB-6, neither of which has 5 or 6 doors. 
The DB-4 was built on a slightly longer chassis than the previous DB-2 to give it extra space for the four door body. The front of the car remains largely unchanged except for the grille, but everything from the firewall back is all new. The shape of the windscreen opening has been changed, and the glass now has curved edges rather than the straight edged glass on the previous model. The rear windscreen is fairly narrow, on the later DB-5 and DB-6 models there rear windscreen is much wider and wraps around the side of the rear pillar, coming within about three inches of the rear door opening. At the front the grille design is significantly different. Instead of having a set of chrome plated horizontal bars like the previous model, the DB-4 now has a pressed steel grille that is painted the same colour at the rest of the car. The grille now incorporates a pair of indicators. Above the grille there is a wide chrome and red strip with the Datsun name in the middle. A large round badge sits above that. 
 The DB-4 continues to use the 722cc 20hp Type 7 side valve engine. It was replaced with the more powerful Datsun DB-5 in 1953.

1951 Datsun DB-4 Sedan Specifications  
Length - 3805mm   
Width - 1480mm   
Height - 1560mm   
Wheelbase - 2150mm   
Weight - 890kg   
Top speed - unknown 

Transmission - Floor
change 3 speed

Engine Specifications 
Model - Type 7 
Side Valve 4 Cylinder  
Capacity - 722cc   
Bore & Stroke 55x75mm   
Power - 16hp@3500rpm   
Torque- 27ft/lb@2000rpm   
Compression - 6.2 : 1   
Carburettor - unknown   
Final drive - unknown

Model Variations
Datsun DB-4  
 The standard sedan version.
Datsun DW-4 - Five Door Wagon  
 There was also a five door wagon version of the DB-4 called the DW-4.
Datsun DV-4 - Three Door Van  
 A three door van version of the DB-4 was also available, either as a panel van or with side windows. 

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