merchauser

Are these 4 hole injectors a benefit? Seem very reasonable; am I missing something? Has anyone bought these?


http://www.ebay.com/itm/1987-1991-Po...JYGzib&vxp=mtr

Imo000

They are re-manufactured = Old injectors that were made look new.

FredR

Quite a few folks [myself included] run with 4-hole injectors and I have never heard of any detrimental comments about them. Allegedly they have a better spray pattern but whether that translates to any real world performance improvement remains to be seen - if they do it is subtle rather than spectacular.

As Imre advises the ones you are looking at are re-manufactured which basically means they are ultrasonically cleaned, new filters and caps fitted and flow tested to some standard and this can be done with your current injectors. With re-manufactured ones you do not know whether they have done 1km or to the moon and back 10 times.

If you have a real need for a set of new injectors contact the likes of Roger to see what he can do for you.

gazfish

I'm far from an expert but the way our cars batch fire the injectors and the mist sits in the intake waiting for the valve to open would minimises any benefit compared to a modern system where the timing is more accurate for each cylinder?

Ad0911

In the case of a CIS injection system: I understand this system injects always, not intermittendly. Isn't that the crudest worst system ever? My 911S injects only when needed with that Bosch injectorpump. Also very bad mpg however.

gazfish

Yes I'd agree CIS is less controlled again, both are still a step forward from carbs though and they both still work in zero or negative G which was important during WW2.

ROG100

We sell hundreds of sets of the Bosch 4 hole injectors. They are all re-manufactured as new is practically unavailable/mega$.
As Fred already stated benefits are subtle but certainly produce a smoother idle when compared to an old original set.
The injectors shown are Design II and providing they are the correct impedance and flow rate will be "plug and play".
Design II are the next design iteration to the original injectors so offer better reliability.
Key issues are - correct impedance, correct flow rate for your installation (Paul yours are 19Lb stock) - many owners move up to 24Lb but this requires a software change in the brain.
Safty - ensure you have the exactly correct O rings both top and bottom as many do not as they were used in different applications. If in doubt I have sets of top and bottom O rings available.

V2Rocket

if your original injectors are single hole pintle type vs the 4-hole "disc?" type...
'youre gonna like the way it drives, i guarantee it'

Imo000

Would be interesting to see New OE injectors VS New 4 hole injectors and if there is any noticeable difference at all.

ROG100

Very much a mute point as originals (19Lb 87 to 95) are NLA.
Choices are limited ---
Have your circa 22 to 30 year old Design I injectors cleaned.
Buy a modern re-manufactured set of 4 hole Design II
Buy a new set of Design III 4 hole injectors - even these are getting hard to find in quantity.

Imo000

Ford doesn't sell the 19lb injectors that were found on the pushrod 5.0s?

FredR

There used to be loads of Ford Motorsports injectors up from grabs for modest bucks [about $200 a set] but they literally seemed to dry up for whatever reason.


I got my "allegedly new" 30lb design 2 injectors from 5-O Motorsports a few years ago. They did not exactly look new but then they did not look s/h either- possibly a bit dull from being stored a good number of years and to date they have worked flawlessly.

If you do a search on Ebay the same outfit offers new design 3 injectors specifically for the 928 with the correct groove size [as I can tell] and seals at about $400 a set- still relatively good value if they cannot be had from Roger. Some of these outfits seem to buy up job lots.

http://www.ebay.com/itm/New-Bosch-19...RY-pHD&vxp=mtr