3.8 Injectors VS 3.4 Injectors

[Incydowt]

Will the injector from a 3.8 work in my 3.4, Do they have a dual spray pattern?

[walterdude]

As far as I know the 3.8 injectors are NOT dual spray, as 3.8s only have 1 intake valve. I've seen a few threads here discussing different makes of cars that use a dual spray pattern... A thorough search should turn up some info.. For sure other people have had to upgrade their injectors... Possibly someone with more knowledge than I can help.....
Tom...

[robertisaar]

i imagine northstars would have a dual-spray pattern.... and would probably flow a bit more fuel as well(the L37 anyway).

[Dave96z34]

They are not but it wouldn't matter to much but they are also much bigger injector so you would have to reprogram the pcm and retune it.

[RedZMonte]

The 3800 injectors are not dual spray like the DOHC injectors... BUT i am running Lucas 42.5# injectors for a 3800 on my DOHC turbo setup. Seems to work fine.. sometimes doesn't idle or act 100% like stock but who knows if thats due to the turbo, tune, Injectors, OBDII swap, Intake manifold swap or what... But long story short if your tuning for the size you can run them.. Im sure if you can find a large set of Dual spray injectors it would be better..

S

[jman093]

I cannot remember the exact flow rate of the Northstar injectors, but it was only slightly more than the stock LQ1 injectors. I have 32# pound L32 (S3 3800) injectors in my car because that's what was in there when I bought it. I have noticed from looking at the fuel trim, that at idle and low rpm the fuel trim is quite high even with injectors 50% larger than stock and the car exhaust smells very rich. I believe that the single pattern injector is squirting the fuel right on the bridge between the valve openings and is puddling, getting sucked in as large drops instead of a highly atomized mixture, necessitating the adding of more fuel since it isn't all burning during combustion, but at higher RPM the faster airflow is alleviating some of the puddling and the fuel trim goes back down. Not an ideal setup. Unless you're boosting the engine and simply need the extra fuel capacity like Shane's turbo setup, there isn't any reason to get a larger injector.

What I would like to do sometime instead of putting stockers back in mine is get the injectors out the 07 and newer LY7 3.6L. They are dual pattern, flow very close to an LQ1 injector (23.6# vs 21# on an LQ1), and GM was bragging these things up for having a highly atomized mixture, which is probably natural that these would be a lot better/higher tech than a 20 year old Multec design. They are GM pn 12609418, ACDelco pn 217-3034.

[robertisaar]

another option may be the HO quad4 injectors if the LY7 injectors prove hard to find.

[Smittro]

Did'nt read all the posts but.. I own an l36 series II 01 Camaro y87 car.. The injectors are dual spray I have'nt seen a series-III being any different.. They are also 21ish pounders NOT anywhere near 30 lbs ther are a few different styles of l36 stock injectors but non flo 30 lbs/hr not even l67 's with the new modified eton 90 flo 30lbs but hey are close.... My 92 LQ1 bosch type/style stock injectors are quad spray (part#no81 17103509).. L36 injectors are taller than the bosch style too. If the engine is running rich on obdII you should be looking for front 02 codes and MAF needing clean with CRC cleaner only.. Just my .o2.. Without having the ses codes posted..

[Smittro]

L36 flow rates 93-2001 l36

Injector Size 17 lbs (AC Delco 217-301)
~22 lbs (AC Delco 217-306)
~22 lbs (AC Delco 217-1436)

[Smittro]

More l36-l67 flow rates

3800 vin C injectors -- 19.0 lb/hr

3800 vin L injectors -- 21.2 lb/hr

3800 SC vin 1 injectors -- 29.0 lb/hr

3800 Series 2 (non SC) Rochester 17103146 injectors -- 21.2 lb/hr

3800 Series 2 (non SC) Bosch 0280150973 injectors -- 21.2 lb/hr

[Smittro]

To the OP;s (?) L36 injectors are dual spray to clear the valve stem, the rochesters are taller than LQ1 bosch type.. In my oppy the l36 injectors are far less efficient than the quad flo LQ1 injectors. I would look for higher lbs/hr quad injectors personally.. L36 in jectors are designed to spray past 1 valve and in an LQ1 app they may just hose the 2 intake valves with fuel making for an inefficient burn.. This could easily lead to a rich inefficient combustion condition.. Of which none of your 02's will like that front or rear..

[ChevyBlown]

what about3800 vin k injectors 24503226 or ac delco 217318 anyone know the flow rate

[RedZMonte]

3800 Series 2 (non SC) injectors -- 21.2 lb/hr (these are Vin K injectors)

[ForcedFirebird]

Injectors from a 1996-1998 m3 (pink tops) are 24lb/hr@3bar, and are dual pattern since they also are DOHC's. Not likely to find them in a junkyard, just thought I would share.

[SappySE107]

old thread, but if you have a 3.4 DOHC and are concerned with dual spray pattern, then you are wasting your time. They hit the tip of the injector and mist, not really a cone spray at all. Just get injectors with the closest fuel flow if you aren't tuning. If you are, just get whatever you can get that is bigger than 22# @ 43.5 PSI. Ive ran 3800 SC 36# and currently the 4.2 I6 trailblazer injectors (28# at 55 psi), both at 60 psi, with the same MPG and no noticeable idle issues or tuning variances other than the injector constant. Offsets vs voltage if you want to fine tune....but im getting way the hell off topic:P