Merc nozzles wrecking a AAZ

[James8485]

i have 1.6 injectors with merc nozzles

i have a aaz and i am about to put them in....

why are there bad reviews from some ppl on here???

i know about the pre swirl or something like that but whats that about???

like you cant wreck anything on the motor can you???      i gots 3000 into the motor alone so if they will cause damage i might want to re consider!

i have already bought them so,,,,,,,,

[jtanguay]

the merc nozzles were designed for a different type of pre-combustion chamber.  i forget the details, but stock nozzles should be able to flow all the fuel you need.

[53 willys]

If Dave from passenger can grab 180+hp with old worn stock nozzles then I think some new stock nozzles will be even better.
so if I can get 180+hp from stockers why even bother with bigger smokier injectors? I think Dave even lost power with his merc tips right?

[ikas]

i wreck a aaz with merc nozzels!

i dont like merc nozzles

[carrizog60]

i wreck a aaz with merc nozzels!

i dont like merc nozzles

sorry but i dont believe that was the nozzles...
i had them with pump delivering all the fuel,run veggy for a while and the engine didnt suffer at all.
it must have been something else and somebody put the blaim on the nozzles...

why do you say that you have wrecked it?what happened?

[myke_w]

The pintle design is definitely different, which makes a different spray pattern, the prechamber is very different, it's much longer in an MBZ.

If the fuel was all being forced into the wrong place because of an incorrect pattern, I would think that could be a problem, especially if it overheated the prechamber.

I'd personally like to see a "side by side" comparison of both spraying through a cross sectioned vw head prechamber.







Maybe I'll do that when I get some free time. 

[Vincent Waldon]

Fantastic pictures Myke.

There's always been an internet rumour of precups dropping out thanks to Merc injectors, and when you see the cut-away like that you can envision the wrong spray pattern dropping fuel in the wrong spot and overheating the precups... wish I was closer and could help you take pictures 'cause I think it's a fantastic idea for an experiment.

BTW, that head has a pretty big crack in it...dunno if it's reusable... 

[andy2]

AAZ nozzles can flow more fuel than a 12mm head can supply them with.They are capeable of flowing more fuel than the engine can handle ! So don't use the merc nozzles if you don't have to.

[RabbitJockey]

if you use a 1.9 head on a 1.6 block should you use 1.9 injectors?

[theman53]

Great reference Myke...is that my old head?
I think with all the posts on this I would stay away from the Merc nozzles and just run the stock ones.

[jtanguay]

i think the main reason people run merc nozzles is to try and achieve the same power, but it's two different designs.  just look at the gm 6.5L diesels.  apparently the 1.9 aaz nozzle will flow as much fuel as those 6.5L nozzles??? 

time for mythbusters!!! 

[myke_w]

Fantastic pictures Myke.

I have to admit these aren't my pics, I could only hope to have a head that was cross sectioned, (anybody have a band saw?). I stole them from a site whose identity I can't remember for the life of me, but had to save them because of their illustration value.

[monomer]

I have a junk OM602.92 Mercedes head here, if anyone wants to cut it up.

[andy2]

if you use a 1.9 head on a 1.6 block should you use 1.9 injectors?

You should be ok to use the 1.6 nozzles in the 1.9 head but it would be better to have the 1.9 nozzles to match the bigger AAZ combustion chamber.

[ikas]

I had a rod  warped because of the nozzles mercedes or who I mounted the nozzles in the injectors. I do not know if the fact that the 10m help! also said that the sb nozzles inject  what the pump can deliver! merc nozzles make the engine sound terrible! I´ve mine merc nozzles on sale