Hydro Diesel









Diesel Fuel Injection

We at Hydro Diesel Injection Services take pride in every job we do!

In the Diesel Fuel Injection Line, we Specialize in:

Distributor Pump

Distributor Pump:

  1. Drive Shaft
  2. Supply Pump
  3. Roller Ring
  4. Cam Plate
  5. Hydraulic Head with pump plunger and control collar
  6. Delivery-valve holder with compression spring and delivery valve
  7. Timing-device plunger with compression spring (Not Visible)


The story of Diesel:

Everyone knows that the diesel engine is economical and long lasting. Yet only a few people know that Robert Bosch made it possible to use the diesel engine in passenger motor vehicles.


It was in 1895 that Rudolf Diesel unveiled his invention to the public: the compression - ignition engine. As compared with the already established spark - ignition engine, this new engine had the advantage that it consumed considerably less fuel, it could be operated on relatively inexpensive fuel and could be also designed for very much higher power outputs.

Diesel's invention quickly established itself and soon had no competitors in field or marine and stationary engines. However, the diesel engine had the great disadvantage of not being able to achieve high engine speeds. As the diesel engine became more widespread and the advantages of the diesel system became increasingly well known, there was more and more demand for a small, high-speed compression-ignition engine.

The greatest obstacle to the high-speed diesel engine was the fuel feed. The hitherto used blow-in method in which fuel was blown into the combustion chamber with compressed air did not permit any appropriate increase in engine speed. Furthermore, the "air pump" was a large, heavy piece of equipment which could not be substantially reduced in size an weight.

At the end of 1922 Robert Bosch decided to concentrate on the development of fuel-ignition systems for diesel engines. The technical foundations were already laid: Bosch already had experience of internal-combustion engines; production engineering was highly developed and, above all, knowledge gained from the manufacture of lubricating pumps could be used to advantage.

Robert Bosch and his team worked untiringly on this new task. In early 1923 aboutRobert Bosch a dozen different injection pump designs had been drawn up, and mid 1923 saw the first tests on an engine. Experts awaited the increasing anticipation the advent of the fuel-injection pump from which they expected a new impetus for the construction of diesel engines. In the summer 1925 the final design was laid down and in 1927 the first series produced fuel-injection pumps left the factory.

This injection pump developed by Bosch finally made the high-speed diesel engine possible and thus prepared the way for a breakthrough of unimagined proportions. The diesel engine enjoyed ever increasing popularity, particularly in motor vehicle sector.

There followed continuous further development of the diesel engine and fuel-injection systems.

DieselWith a top speed of over 360km/h, a diesel experimental vehicle with a Bosch injection system recently demonstrated what the present-day diesel power plat is capable of. Usually, the makers of such record breaking vehicles are reluctant to speak about consumption. Not with the diesel: of 360km/h this vehicle consumed only 13.61 per 100km and at 250km it even contented itself with 61 per 100km.

Almost a century later, the potential of Rudolf Diesel's invention is apparent, as is demonstrated in particular by the annual increase in the number of passenger cars equipped with diesel engine. Almost every European automobile manufacture now has at least one diesel car in his range or in development.

Introduction to Zexel

Established:           17 July 1939

Head Office:           Tokyo, Japan

Employees:            4769

Main Activities:
Development, manufacturing and marketing of diesel and petrol fuel injection equipment as well as car air-conditioners.
Major Shareholders:
Robert Bosch GmbH 50.14%
Nissan Motor corp. 6.87%
Isuzu Motors Ltd. 3.62%

Zexel became a member of the Bosch group in 1997 after Bosch acquired 50.04% of Zexel shares. On July 1, 2000 Zexel Corporation changed its name to Bosch Automotive Systems Corporation.

Product Information

Timing and Injection Rate Control System - TICS

Tics is a sophisticated system that detects engine conditions, vehicle speed, coolant temperature, accelerator angle, etc to control the fuel-injection engine, and vehicle to the highest efficiency at all times. To control the volume and timing of injection, TICS has an electronic governor with a linear DC motor, and an electromagnetic rotary actuator. In addition, it has a movable timing sleeve for prestroke control to realize a variable injection rate (pressure). At low speed, the prestroke is increased to raise the injection pressure so that smoke emissions and improved while increasing the torque. At high speed, the prestroke is reduced to advance the injection timing while suppressing an excessive increase of the injection pressure to decrease NOx emissions.

VP44 System

The VP44 system has been developed for the purpose of reducing Co2 emissions to help cope with the problem of global warming and, of course, to reduce fuel consumption. It is a direct-injection type fuel-injection system to small-to-medium-size diesel engines. High pressure injection is indispensable if direct-injection is to be realized. This was previously difficult for small to medium size diesel engines, but this injection system has succeeded by using internal cam disk and radially opposed plungers to pressurize the fuel. VP44 controls the injection quantity and injection timing using two electromagnetic valves. The electronic control is also divided into two, with the compact control unit mounted directly on the pump. The VP44 makes it possible to decrease exhaust emissions and power performance fluctuations found among individual vehicles.