Exhaust Manifold.

[darrenjlobb]

Changing combustion chambers will hardly help the problem at all...

What dictates the main issue with nozzles is the position the injector sits in the head.. most pots in pistons are all very similer / only require very slight angle adjustments in the nozzle, but this isnt what is so important, you can easily get away with being out with the nozzle angle, I think there's a big misunderstanding amoungst most of the hdi boys on here with regards to nozzles and angles....Its something that the likes of me / other diesel nuts dont talk about much, as it DOES cost money experimenting with nozzles to figure out what is right, but esitronic and the internet can help alot to save buying as many used injectors to look at what nozzles are in them etc...

There are TWO critical things with nozzles.. Angle of cone, and angle of plane....this is what imo no one seems to understand including alot of "specilists" after looking at work they have done...

DI engine, bowl in piston, injector over that bowl, injector sprays a cone spray over the bowl, you want the cone to go in the bowl, not outside / in the middle of it, or you will melt things, but as as i said before, thre is ALOT of give here, its no big deal...espically not with low power levels like 200hp, you could be 15 out and still not melt anything.

So say for example you were running a set of 152 (thats a 152 degree spray cone out the end of the nozzle), for this to work the injector would need to be perpendicular with the piston right....or else 152 angle is just on its side, meaning half is hitting the middle of the piston, and the other half is hitting the cylinder wall..what use is this, none, at all....hence injector PLANE angle, which is the angle the injector sits in the head...this is by far, the most important thing you need to figure out before you start messing with nozzles...and trust me, when you start looking back at some projects, you will now begin to see the scale of fail!

So in the 8v hdi for example, the injector is at x degrees (go figure yourself ) meaning the STOCK 8v hdi nozzles have the cone at x degrees, BUT the cone exits the bottom of the nozzle at an angle, the angle of plane, meaning it still matchs up with the bowl, even though the injector is on the piss..now you begin to see the next probem...you can just start spinning the inector round willy nilly, becauase it also needs to go in EXACTLY the right rotation, or else again, you will just be spraying fuel all over the place...and no, this rotation is NOT the same among all engines, this is why they have a crow foot mount, so they only go in one way...

Its not a problem ,you just have to understand / KNOW about it, so you can A get the right nozzle, B put it in correctly, and C know what the hell is going on, then you WILL make chronic horsepower, end of no questions....but from what ive seen so far, there is very little understanding of this with any of the HDI builds ive seen....

Does that help explain poodle / jonny etc?

Darren

Quick paint lash to explain