fuelinjectors.pdf

MOTORSPORT COMPONENTS B7

FUEL INJECTORS

IMPORTANT INFORMATION ABOUT FUEL INJECTORS

Important Information About Technical Specifications

• Bosch fuel injectors have their flow rates defined in N-Heptane as part of their engineering specification. N-Heptane is a pure

chemical and does not have the same viscosity and density as standard petrol. Hence the N-Heptane flow rate figures stated

should be used as a general guide for comparison purposes only.

• or safety reasons, Bosch strongly recommends that Local and/or Federal Government health and safety regulations are adhered

to when using or handling any of the mentioned test fluids.

• tated “Operating Pressure” is the pressure that the fuel injector is designed to operate at to give optimal fuel atomisation and

control. This is more critical to the EV1 pintle type fuel injectors.

• Whilst it is common industry practice to request static flow rate only of a fuel injector, it is important to note that one type of

valve group with a specific static flow rate can be used for a number of fuel injectors with different dynamic flow rates.

• Fuel flow specifications are given in grams per minute [g/min]. This is an internationally accepted standard at vehicle manufacturing

level. As development engineers deal with the weight or mass of air inducted by an engine not its expected power rating, the

weight of fuel that an injector can provide is the pivotal measurement. Bosch does not rate fuel injectors related to expected

engine power outcomes.

Bosch Does Not Warrant the Performance of its Components when they are Used with

Certain Fuels or Fuel Additives.

• Bosch fuel injectors are designed for use with standard grade petrol. Subject to statutory warranties, Bosch does not warrant

the performance characteristics or specifications of these fuel injectors if they are used with Alcohol or Ethanol based fuels or

fuel additives that are corrosive.

• Fuel Injector 0 280 150 842 is designed for CNG operation only. Bosch has not tested this fuel injector for permanent service

using liquid fuels, therefore it is not recommended for liquid fuel control systems. Control issues may result due to internal valve

group sensitivity to viscosity differences between liquid and gaseous fuels.

Bosch Is Not Liable For Third Party Recommendations or Modifications

• Modification of fuel management systems should only be carried out by suitably qualified personnel. It is the responsibility of the

purchaser/consumer to ensure the product is compatible with the fuel management system used to avoid damage and/or injury.

• In any event, subject to statutory warranties, Bosch is not liable for damage caused by third party recommendations or

modifications.

• Modification of fuel management systems may cause a vehicle to contravene state or federal emission laws. Bosch does not

endorse or recommend the modification of standard vehicles and does not accept liability for damages or consequential loss

related to any modification undertaken.

B8 MOTORSPORT COMPONENTS

FUEL INJECTORS

Purpose and Function.

Fuel injectors perform an important role in the accurate metering and

atomisation of fuel. These electro-mechanical valves react in milli-sec-

onds to open and close giving the electronic control unit optimal control

over fuel flow to the engine.

Method of Measurement.

Fuel flow specifications are given in grams per minute, as this is an inter-

nationally accepted standard at vehicle manufacturing level. As vehicle

development engineers deal with the weight or mass of air inducted by an

engine not its expected power rating, the weight of fuel that an injector can

provide is the pivotal measurement. Bosch does not rate fuel injectors

related to expected engine power outcomes for this reason.

Power Ratings of Fuel Injectors. [Horsepower]

It has become an aftermarket performance industry practice to rate fuel

injectors in relation to expected engine power outputs, mainly

Horsepower.

As this method of measurement has many issues in relation to various cal-

culation methods, accuracy, individual interpretation and overall relevance,

Bosch as an Original Equipment supplier of fuel injectors, does not sub-

scribe to this specification method.

There are many design requirements taken into account when under-

taking the design and manufacture of a fuel injector to suit a particular

application. Further explanation can be found under the “Method of

Measurement” heading in this section.

EV6 - Standard Version

Effects of Fuel Pressure on Pintle Type Fuel Injectors.

Fuel velocity through a pintle type fuel injector [type code EV 1] can dra-

matically affect its ability to atomise fuel. The profile of the pintle used in a

fuel injector has a direct relationship to the operating pressure it is designed

to operate under. Whilst Bosch produce various fuel injectors that may flow

the same amount of fuel at a given specification, the system operating pres-

sure will influence the pintle profile. Correct pressure will result in a well

atomised spray, while insufficient pressure will result in a “hosing” effect.

Excessive pressure will result in either “hosing” or a spray angle that is too

large for the targeted area dependent on the pintle profile.

The consequence of excessive fuel pressure on a pintle type injector may

well be that as the pressure is increased the mixture values of the engine

may appear to get leaner. This is of course not the case, but the fuel being

injected is no longer atomised and is entering the cylinder as a liquid mass.

This will typically cause the Hydrocarbon [HC] values to rise due to the raw

fuel exiting the cylinder, and the Carbon Monoxide [CO] to drop due to

insufficient combustion.

Later design fuel injectors [type code EV 6] use “director plate” multi-ori-

fice technology to better atomise fuel across various operating pressures.

These injectors allow more flexibility in relation to operating pressures with-

out compromising spray efficiency or fuel atomisation.

APPLICATION NOTE

Fuel Injector 0 280 150 842 is designed for CNG operation only. Bosch

has not tested this fuel injector for permanent service using liquid fuels;

therefore it is not recommended for liquid fuel control systems. Control

issues may result due to internal valve group sensitivity to viscosity dif-

ferences between liquid and gaseous fuels.

EV6 - Long Version

* IMPORTANT NOTE

Bosch fuel injectors have their flow rates defined in N-Heptane as part of

their engineering specification. N-Heptane is a pure

chemical and does not have the same viscosity and density as standard

petrol. Hence the N-Heptane flow rate figures stated should be used as a

general guide for comparison purposes only.

MOTORSPORT COMPONENTS B9

FUEL INJECTOR TECHNICAL DATA

Flow Qty*

Operating

Part Number

g/min

Pressure Resistance Design

@ 3 Bar

(Bar)

(ohms)

Type

Connector

Comments

0 280 150 036

364.3

2.0

2.4

EV 1

1 284 485 002

Hose Type

0 280 150 135

147.4

2.5

2.4

EV 1

9 122 067 011

Hose Type

0 280 150 166

185.7

2.5

2.4

EV 1

9 122 067 011

Hose Type

0 280 150 215

187.3

2.5

16.2

EV 1

9 122 067 011

0 280 150 363

479.8

2.7

0.7

EV 1

9 122 067 011

0 280 150 403

402.8

2.7

2.3

EV 1

9 122 067 011

Manufacturer Specific Inlet

0 280 150 558

326.8

2.7

14.5

EV 1

9 122 067 011

0 280 150 706

186.7

2.5

15.9

EV 1

9 122 067 011

0 280 150 775

186.7

3.3

15.9

EV 1

9 122 067 011

0 280 150 790

149.7

2.7

15.9

EV 1

9 122 067 011

0 280 150 791

311.0

3.8

12.0

EV 1

9 122 067 011

0 280 150 803

286.6

2.5

4.6

EV 1

9 122 067 011

0 280 150 842

1207.2

1.0

4.6

EV 1

9 122 067 011

Refer Application Note

0 280 150 901

146.3

3.0

14.5

EV 1

9 122 067 011

0 280 150 960

150.5

3.0

14.5

EV 1

9 122 067 011

0 280 150 967

269.7

2.7

14.5

EV 1

9 122 067 011

0 280 155 777

150.0

3.5

12.0

EV 6

9 122 067 011

Long Body

0 280 155 821

150.0

3.0

14.5

EV 6

9 122 067 011

Long Body

0 280 155 844

150.2

2.7

14.5

EV 6

9 122 067 011

Long Body

0 280 155 868

261.1

3.5

12.0

EV 6

9 122 067 011

Long Body

0 280 155 890

172.0

3.5

12.0

EV 6

9 122 067 011

Long Body

0 280 155 917

142.5

2.7

14.5

EV 6

Non-Bosch Plug

Long Body

0 280 155 931

187.0

3.5

12.0

EV 6

9 122 067 011

Long Body

0 280 155 968

310.0

3.8

12.0

EV 6

9 122 067 011

Dual Spray/Long Body

0 280 156 012

310.0

3.8

12.0

EV 6

9 122 067 011

Standard Body

0 280 156 013

172.0

3.5

12.0

EV 6

9 122 067 011

Long Body

0 280 156 123

213.0

2.7

14.5

EV 6

9 122 067 011

Dual Spray/Long Body

0 280 156 186

213.0

4.0

14.5

EV 6

9 122 067 011

Dual Spray/Long Body

B10 MOTORSPORT COMPONENTS

FUEL INJECTOR TECHNICAL DATA

Flow Qty*

Operating

Part Number

g/min

Pressure Resistance Design

@ 3 Bar

(Bar)

(ohms)

Type

Connector

Comments

B 280 431 128

364.3

> 8

EV6

9 122 067 011

Standard body

25º spray angle

B 280 431 129

364.3

> 8

EV6

9 122 067 011

Standard body

70º spray angle

B 280 431 130

493.1

> 8

EV6

9 122 067 011

Standard body

25º spray angle

B 280 431 131

493.1

> 8

EV6

9 122 067 011

Standard body

70º spray angle

Revision 1 - December 2003

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