gotta replace the fuel injectors, pintle vs. 4-hole spray

[brianl703]

Well, it turns out that the injector o-rings aren't what was leaking on the 1988 Mustang 5.0.

I smelled gas again, and after wondering how I could possibly mess up an o-ring replacement, I asked my mechanic who stated that it's more common for the injector itself to leak than it is for the o-ring to leak.

So I added some UV dye to the gas (it's a VERY small leak)and drove it to work and back, and when I got home the UV light showed that the o-ring that I thought was leaking the first time around is actually the injector leaking where the plastic meets the metal. It also showed another injector leaking that I didn't even know was leaking.

So now I have decided to replace the injectors.

Most of the replacement #19 injectors seem to be "4-hole spray" injectors, instead of pintle spray which is what it has now.

Does anyone know what the advantages and disadvantages of 4-hole injectors over pintle injectors are?

From what I've been able to find out, they have better response time.

I've also found out that Ford no longer uses pintle injectors.

I've read conflicting information in terms of deposit resistance and spray pattern, with some saying that 4-hole is better and others saying pintle is better.

 

[DJ]

I do not know what type they are but I do know the Ford SVO injectors like the ones Summit and Jeg's carry are good and are even a popular upgrade when us Chevy guys find ourselves in need of larger injectors. Whatever you get make sure that they are either very similar to what you already have or that you have the computer modified to work with them. There is more to injectors than just flow and different manufacturers rate their flow at different pressures so you really need to do some digging to figure out if an injector really fits the bill.

 

[brianl703]

The ones I'm looking at are made by Bosch, like the originals, and they're both orange-colored, so flow rate should be the same. They're listed as being a direct replacement for the Mustang 5.0 -- for now I'm not going to do anything that'll require larger injectors. I want to make this thing handle better before I make it go faster.

 

[Matt-TDI]

Pintle style injectors usually get deposits on them. This is also why fuel system cleaners often times appear to have a better effect on engines with pintle injectors than ones without. You'll also notice that most injectors on new cars do not have pintle-style.. and it is for that very reason.

 

[DJ]

SVO 19lbs. from Summit Is this basically what you are loking at? I do not know if the SVOs are rebadged Bosch but they might be.

 

[tom slick]

RC Enginnering is experts on FI and could probably answer all your questions and make you a deal on some new injectors. they are a great shop.

 

[brianl703]

Thanks for the info. I've decided to go with reconditioned/flow tested 19# 4-hole spray injectors from an Ebay seller with good feedback. $130 for the set of 8, which works out to $16.25 per injector which isn't bad because most places charge $12 per injector to clean and flow test.