21-02-2013, 02:11 PM
HDis are not sat upright at all! They sit at quite an angle backwards, about 15* backwards...
Go and take a look at other engines and there's usually one major factor that changes how the injector sits... Go look at petrols too, their spark plugs do the same thing with this change - it's quite obvious when you look.
The cone angle DSLA155P1240+ Doesn't make any difference really, you can be up to about 10* out and it really doesn't matter, however PLANE angle as mentioned by Poodle does seriously matter - get it wrong, it's a recipe for melted engines!
There was a thread back along where Darren explained most of this, but essentially when you tilt the injector, it then starts to matter what angle of rotation the injector sits in the head... That is specified by the crows foot/injector body, offset bushing and nozzle mounting...
Sean - look at the table you posted up again, look at the orifice size in relation to the amount of holes - obviously more holes at the same size = more flow, they realised that it's better to have more holes, but smaller for better atomisation... But notice the one thing that's different between the 6x0.150 nozzles and the 6x0.165 nozzles - which seemingly are just 20v vs 10v engines (oh look, I've just given the game away
)... One has a DSLA part number and one has a DLLA part number, I'll leave that to you to find out why they're quite a bit different and the hole size is smaller... I'll give part of it away that the later 20v engines run a later CommonRail system that can run higher pressures (higher pressure = more fuel in a given time)...
Go and take a look at other engines and there's usually one major factor that changes how the injector sits... Go look at petrols too, their spark plugs do the same thing with this change - it's quite obvious when you look.
The cone angle DSLA155P1240+ Doesn't make any difference really, you can be up to about 10* out and it really doesn't matter, however PLANE angle as mentioned by Poodle does seriously matter - get it wrong, it's a recipe for melted engines!
There was a thread back along where Darren explained most of this, but essentially when you tilt the injector, it then starts to matter what angle of rotation the injector sits in the head... That is specified by the crows foot/injector body, offset bushing and nozzle mounting...
Sean - look at the table you posted up again, look at the orifice size in relation to the amount of holes - obviously more holes at the same size = more flow, they realised that it's better to have more holes, but smaller for better atomisation... But notice the one thing that's different between the 6x0.150 nozzles and the 6x0.165 nozzles - which seemingly are just 20v vs 10v engines (oh look, I've just given the game away
)... One has a DSLA part number and one has a DLLA part number, I'll leave that to you to find out why they're quite a bit different and the hole size is smaller... I'll give part of it away that the later 20v engines run a later CommonRail system that can run higher pressures (higher pressure = more fuel in a given time)...