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PE in-line injection pumps for alternative fuels
Application, design, and construction
Specially designed diesel engines can operate on alternative fuels, whereby one differentiates between:
—Multifuel engines which in addition to diesel fuel, can also run on gasoline (petrol) or kerosene.
—Alcohol engines which operate with methanol or ethanol (ethyl alcohol).
—Engines which run on biomass fuels.
The change from one type of fuel to another necessitates adaptive meas-ures in the fuel-metering in order to avoid excessive variations in power output. The most important fuel characteristics are: Viscosity, boiling point, lubricity, density, and self-ignition point. Constructional measures are necessary at the fuel-injection equip-ment and at the engine in order that these characteristics can be optimally matched to each other.
If diesel fuels with a considerably re-duced sulphur content are used with Bosch in-line PE fuel-injection pumps no negative effects are to be expected. Alternative fuels though have a lower boiling point which means that the injection pump’s fuel gallery must be flushed more intensively and at higher pressures. A special fuel-supply pump is available for this purpose.
Injection pumps for alcohol engines
The in-line injection pumps are also suitable for operation with methanol and ethanol (ethyl alcohol) provided they have been modified beforehand. Such modifications include:
—Fitting special seals and gaskets,
—providing special protection for surfaces in contact with alcohol,
—fitting rustproof springs,
—operating with special lubricants.
In order that the engine receives an amount of energy equivalent to that provided by diesel fuel, the delivery quantity for methanol is 2.3 times higher and that for ethanol 1.7 times higher. And compared to diesel fuel, considerably more wear must be expected at the delivery-valve seats and nozzle-needle seats.
Subassemblies
Injection pumps for multi-fuel engines In the case of low-density fuels (gasoline/petrol), the full-load delivery is increased by means of a switchable control-rod stop. On the other hand, in order to prevent fuel losses when low-viscosity fuels are used, the pump’s plunger-and-barrel assemblies are pro-vided with an oil block in the form of two ring-shaped grooves in the pump barrel.
Injection pumps for biomass fuels
Serious complications in the diesel fuel-injection installation are not to be ex-pected when an engine is run with rape oil (RME). Although, depending upon the specifications of the fuel in use special measures may be required.
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99 JETTA TDI HERR WETTERAUER TORQUEMEISTER
98 KAFER WETT SPEKTAKULARE TURBOKOMPRESSOR
97 KTM 620 ADVENTURE RALLY PARIS-DAKAR SUPER THUMPER
Application, design, and construction
Specially designed diesel engines can operate on alternative fuels, whereby one differentiates between:
—Multifuel engines which in addition to diesel fuel, can also run on gasoline (petrol) or kerosene.
—Alcohol engines which operate with methanol or ethanol (ethyl alcohol).
—Engines which run on biomass fuels.
The change from one type of fuel to another necessitates adaptive meas-ures in the fuel-metering in order to avoid excessive variations in power output. The most important fuel characteristics are: Viscosity, boiling point, lubricity, density, and self-ignition point. Constructional measures are necessary at the fuel-injection equip-ment and at the engine in order that these characteristics can be optimally matched to each other.
If diesel fuels with a considerably re-duced sulphur content are used with Bosch in-line PE fuel-injection pumps no negative effects are to be expected. Alternative fuels though have a lower boiling point which means that the injection pump’s fuel gallery must be flushed more intensively and at higher pressures. A special fuel-supply pump is available for this purpose.
Injection pumps for alcohol engines
The in-line injection pumps are also suitable for operation with methanol and ethanol (ethyl alcohol) provided they have been modified beforehand. Such modifications include:
—Fitting special seals and gaskets,
—providing special protection for surfaces in contact with alcohol,
—fitting rustproof springs,
—operating with special lubricants.
In order that the engine receives an amount of energy equivalent to that provided by diesel fuel, the delivery quantity for methanol is 2.3 times higher and that for ethanol 1.7 times higher. And compared to diesel fuel, considerably more wear must be expected at the delivery-valve seats and nozzle-needle seats.
Subassemblies
Injection pumps for multi-fuel engines In the case of low-density fuels (gasoline/petrol), the full-load delivery is increased by means of a switchable control-rod stop. On the other hand, in order to prevent fuel losses when low-viscosity fuels are used, the pump’s plunger-and-barrel assemblies are pro-vided with an oil block in the form of two ring-shaped grooves in the pump barrel.
Injection pumps for biomass fuels
Serious complications in the diesel fuel-injection installation are not to be ex-pected when an engine is run with rape oil (RME). Although, depending upon the specifications of the fuel in use special measures may be required.
------------------
99 JETTA TDI HERR WETTERAUER TORQUEMEISTER
98 KAFER WETT SPEKTAKULARE TURBOKOMPRESSOR
97 KTM 620 ADVENTURE RALLY PARIS-DAKAR SUPER THUMPER