P
Pascal 71
Apprenti
Juste pour info, un moteur de 306 Maxi développe aujourd'hui + de 300 Cv et coute la bagatelle de 30 K€ pour 1000 bornes de spéciales.
Effects of Fuel Pressure on Pintle Type Fuel Injectors.
Fuel velocity through a pintle type fuel injector [type code EV 1] can dramatically
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 pressure 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-orifice technology to better atomise fuel across various operating pressures.
These injectors allow more flexibility in relation to operating pressures without compromising spray efficiency or fuel atomisation.
tout se monaye , tu veux quoi??Turbo a dit:KY, héhéhé Fred ach so, piti filou, normalement pour me faire parler sur ce genre de truc, il faut quelques zéros derriére...ou peut etre la gégéne ?
de la dure limite entre forum et secrets de cuisine - mais je serais pas le premier polichinelle à garder mes petits secrets !
je crois que j'en ai déja trop dit en fait ?!...mais comme t'es un pote je te dirais le détail, tkt