Would these work ok with a lightly modified 3.1?



http://truckperformance.com/products...bddb55eeb197fc

 

They would probably work fine, but I'm pretty sure that 3.1s came with 17lb/hr injectors.

 

3.1's had 15 pound injectors 3.4 had 17 pound

 

what about the 2.8's?

 

summit has some 21lb and 19lb for a little less money for the 3.1 or 2.8 by accell i'm gonna switch soon

21lb

19lb

 

pretty sure they are 15s too!

I have 19s with my 3.4 and I need a tune bad to run with them...the exhaust reaks of fuel! 19s are a bit strong w/o a good custom chip! I got mine out of a ford in a junk yard & had rich @ cruzin performance clean and blue print them! That would be the best $ way to go!

 

I thought 2.8s got 13s. I am still running stock injectors in my motor... I need to do some datalogging to see if I need something a little bigger but it doesn't really act like it does. I've got a set of 19s if I need them, though.

 

I know for a fact that 2.8L engines use 15 pph injectors.

Anyhow, I just got my cleaned and flow-tested 2.8L injectors back from Rich Jensen at CruzinPerformance.com. After Rich's excelent job of cleaning them, the data sheet shows 5 of the injectors flow 15.57 pph and #6 flows 15.39 pph. Before cleaning they were within 5-6% flow of each other (after 117,000 miles) - after cleaning they are all within 1-1.5% of each other with improved spray patterns (on Rich's scale of Good/Fair/Poor, they are now rated Good where before they were rated Fair).

I just put them back in the car this last weekend, but I haven't started or driven it yet. I need to replace the fuel filter (it's a good idea to do so after new/cleaned injectors, and besides, it's due any way).

(Also note that my car is an '89 Camaro RS - I fully expected the injectors to be Multecs - but when I pulled them, they were Bosch pintle-style. I wonder if they had been replaced at some point in the past...I thought '89s came with Multecs. Not that I mind, Rich will actually clean the Bosch style, I hear he won't bother with the Multecs sometimes.)


*Edited: To remove the "In that case, I would think that 3.1L engines use 17 pph injectors..." comment - see redraif's post below.

 

Well if you used that logic, the 3.4 would have been 19s & they are not! I'm sure it was 15 in both the 3.1 and 2.8...then 17s in the 3.4!

Well poor rich has done some fun ones for me...ford 19#s & my stock cold start injector. He also did my Nissan injectors! I will probably be sending him my fiero ones too!

 

2.8- 13 pound
3.1- 15 pound
3.4- 17 pound

 

Oh, ok.
Rich will clean and flow test the cold start injector? Oh. I didn't know that...I didn't pull mine when I sent the injectors in, is it really similar to a regular injector? Hmmm...I guess the cold start is a top-feed injector isn't it? And Rich's page does say he cleans top-feed style injectors.

 

Yep! I took a chance and he said he would look at it and see if he could clean it...same for the Nissans...he was able to do both for me! Heck of a guy and quick turn around to!

 

tried to run a search to see what the 2.8s came with...seems every post says...13s...no 15s...no 13s...no 15s! Who knows! This can be so frustrating! The funny thing is I had the 19#ers on the 2.8 for a while, before I got the 3.4 installed...talk about overkill!

 

a couple of things...

1) did ya ever notice that amongst the discount parts store catalogs, all the injector p/n's seem to supersede to a universal 60deg v6 injector, making it seem that they would all work? compounded by
2) regardless of the #/hr rating of the injector, even if one flows more than another at a given pulse width, won't the computer narrow the pulse width until 14.7:1 (or close) is reached? making the #/hr rating pertinent only when the cylinder filling characteristics are altered? (i.e. porting, cam swap, different intake/tb)

these are just a couple of things that bubbled up in my mind while i was reading this thread. i'm not saying i'm right--this is just what i came up with. what do y'all think? i do accept differing opinions...

 

It'd be great if we could just cross-reference the part # stamped on the injector, then we'd know for sure what they were.

I think only 90-92 Gen 1 3.1's and all 85-up Gen 2 V6's got Multecs. My Multec set came from a 90 3.1. Every Gen 2 block I looked at (2.8 or 3.1) had Multecs... the only Bosch's I could find were in our Gen 1 2.8's.