agree with ZH on injectors, I would just test them see how they flow and if obvious problems then try picking the best of the litter. I did get mine prof cleaned locally, but you never really know what they actually did. Main thing is to avoid leakers or really poor spray. That being said the "spray pattern" is not all that great looking. Perhaps its the injector being dirty OR maybe just the lower pressure they operate at, compared to modern systems anyway. You could always just rig up a setup to spray cleaner both forward and reverse while triggering them. I think just using them by driving is the best way to clean assuming those filters are not clogged up.

The early Bosch style injectors just sprayed a stream.  Primitive.

2 minutes ago, Zed Head said:

The early Bosch style injectors just sprayed a stream.  Primitive.

so if you got a "pattern" it was prob just dirty interrupting the stream!!

Found some links - https://www.witchhunter.com/spraypattern1.php

http://performancefuelsystems.com/InjectorSprayStyles-TechCorner.htm

They say the pintle is designed to spread the fuel but, as you've seen, and me too, it's not much.

Edited February 24, 20205 yr by Zed Head

If I remember right a set of the Standard FJ707T was as cheap as having mine sent off and cleaned.

That was a pain in the rectum trying to get info on injectors in 2011 when I built the 2.8 motor.  You'll see Bigfoot before you get straight, consistent data.  Those FJ3s on ebay were a popular choice back then.  Fastwoman had them and liked them too.  She was quite picky, OCD-ish, I miss her participation on here. 

I have seen new style injectors sold as a replacement, IIRC something with 4 hole heads, short tails that have been modified to work with reg hose, and they are designed to not use the resistors to drop current flow due to different coils. sounds like a lot of differences from the recommended replacements. I wonder if the lower pressures would effect them as well?

Mine didn't look like the OEs.  

They did come with both the larger and smaller rubber insulators.

 

 

Edited February 24, 20205 yr by siteunseen

so those did not have a pintle cap at all or did you remove it? guessing removed since can't see the needle.

Edited February 24, 20205 yr by Dave WM

No pintle cap.  I didn't modify them at all, just slid them in.  I think they had a wider spray than the OEs did but that's been many beers ago when I researched and decided to buy them.  I'm not sure they still sale the 707"T"s. Never knew what that T stood for either.

The T means "economy" product.  There a lots of T products from Standard.

I don't see it on Rockauto https://www.rockauto.com/en/catalog/nissan,1978,280z,2.8l+l6,1209260,fuel+&+air,fuel+injector,6224

The selection is much smaller than it used to be.  No BWD either.

But Standard shows the same style on their web site for the FJ707.   You have to fill out some stuff, it uses cookies.  

https://www.standardbrand.com/en/ecatalog?year=1978

Okay, that question has opened a small can of Z worms I see. Here are pics on my injectors that came on this engine from the JY. Status.....unknown, they appear to be original. They look a bit dirty but that’s not a tell tale sign of operational condition I know.
They are all identical.




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