Author Topic: can anyone ID these nozzles? (Read 3966 times)

Smokey Eddy · « **on:** November 14, 2008, 11:32:33 am »

I think this is "Smog"'s site? I don't know though.
I have these nozzles in my injectors and i don't know what size they are. now that i know a little more im curious to know.
http://www.veg-injection-service.com/store/index.php?main_page=product_info&cPath=6_8&products_id=29

Smokey Eddy · « **Reply #1 on:** November 20, 2008, 09:38:38 pm »

bump

anyone bought these nozzles before?

burnt_servo · « **Reply #2 on:** November 21, 2008, 08:55:47 am »

i've got a set of these in my car right now .

they have a flat spot on the needle if the injector that many people claim is desgined for self cleaning and thusly ideal for veg oil .

the flat spot causes a different spray pattern , and i found that at stock vw pop pressures , about 1/3 of the spray was droplets rather than mist .

until i got around 2500 psi then things started to clean up .

before my next trip to edmonton i've got a set of gtd nozzles i think i'm going to try .

Vincent Waldon · « **Reply #3 on:** November 21, 2008, 10:33:47 am »

FWIW Giles says he wouldn't use Merc nozzles himself, and having seen the spray pattern I've put the set I bought on the shelf unused as well. Like burnt_servo I found that the stock breaking pressure wasn't enough to generate the mist that the VW swirl chamber is expecting.

It's my understanding that the topology of a Merc head is quite different from the heads we use, and it would make sense that the nozzle design reflects that. Mind you, I don't use veggie....

My guess is that Burnt_servo is going to like the GTD nozzles just fine, at stock breaking pressures.

zukgod1 · « **Reply #4 on:** November 21, 2008, 11:10:38 am »

I just went from the Merc tips to the "GTD" tips as well.

I didn't notice a difference in power but I do get a smother idle.

burnt_servo · « **Reply #5 on:** November 21, 2008, 11:41:35 am »

there is a "white paper " from vw on the beginings of the vw diesel around here somewhere .

after reading that i found out that vw uses a "swirl chamber " not the standard precup chamber alot of other engines use .

the swirl chamber allows the diesel to rev like a gas engine .

that also means the injectors need to produce a even . circular spray pattern to have a even swirl and even burn .

the merc tip only produce 2/3's of a circular spray , and 1/3 kind of sprays back in toward the centre of the circle with much much larger droplets .

this wouldn't be so bad if a guy could index the injector to the combustion chamber so a even amount of fuel is sprayed to both of the swirl impresions on the piston .

but the needle in the tip is able to turn in the injector , so this is impossible.