North American Turbocoupe Organization



Replacement Fuel Injectors?
Nitro_X Offline
Senior Member
#1
I have two injectors leaking around the metal to plastic junction. I want to buy four new ones. I've heard about disk type (self cleaning?) vs. pintle (stock) type. I know they're low impedance. Has anyone replaced theirs with disk? Any experience, tips, etc. would be greatly appreciated.

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87 TC, T-5 swap, solid state IVR, fog light relay mod, PST / KYB-AGX, med. red, spoiler, 181K+ Mi's., daily driver, still eating Ricers!
87 TC, T-5 swap, billet quadrant / adj. cable, solid state IVR, fog light relay mod, PST suspension, KYB-AGX fronts, Gas-A-Just rears, K&N cone, billet alum BCV, med. red, 90's wing, polished snowflakes and centers, 195K+ Mi's., daily driver, feeding on ricers!
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philS Offline
Senior Member
#2
If they are leaking where the injector meets the fuel rail, it could be just the O-rings that need to be replaced ... before you dish out the dough for all new injectors.

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86 TC, 73 Mini, 72 Mini Van project, SVT Focus
Click here to beat a ricer.
Did you hear about the Lucas powered torpedo? It sank.

86 TC, 73 Mini, 64 Mini Van, Saturn wagon
Click here to beat a ricer.
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Nitro_X Offline
Senior Member
#3
No Phil, they're leaking at the upper plastic to metal junction. I've been all through the o-ring replacement repeatedly. Last time (a couple of months ago), I replaced them all with Ford OEM's lubed with motor oil and installed with the care of a cardiac surgeon. I smelled the leak the other day, pulled the car in the shop, dried the injectors and watched at idle as the gas seeped out at the joint, not the fuel rail. I've got three full sets (all off cars with >150K mi's.) of brown tops and this is the last "good" set. Time for new ones. Any recommendations on disk versus pintle, before I shell out the big bucks?

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87 TC, T-5 swap, solid state IVR, fog light relay mod, PST / KYB-AGX, med. red, spoiler, 181K+ Mi's., daily driver, still eating Ricers!
87 TC, T-5 swap, billet quadrant / adj. cable, solid state IVR, fog light relay mod, PST suspension, KYB-AGX fronts, Gas-A-Just rears, K&N cone, billet alum BCV, med. red, 90's wing, polished snowflakes and centers, 195K+ Mi's., daily driver, feeding on ricers!
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Spooler87 Offline
Posting Freak
#4
Hmm good question......

I Dont see any major differences between the pintle style and the caltec (Disc style, self cleaning) injectors. I Actually ran 3 self cleaning and 3 pintle types in my 3.8 t-bird, and didnt have any problems. Just to be safe, I would reccomend getting the pintle type and just run some injector cleaner through it at every other oil change. Spray pattern may be a bit better with the self cleaning, but the difference performance-wise is nil.

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87 Tubocoupe, Light Regatta Blue, All Options incl. Leather; 2.5" exaust, Dynamax super turbo mufflers w/3"chrome tips, MSD 6AL, Blaster2 Coil and wires, Homemade adjustable boost valve.

"May the fluids under the hoods of the beleivers flow forever"
All hail Project "Marauder" !
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Pete D Offline
Administrator
#5
The January 2004 issue of Hot Rod did an article on rehabing injectors, the pro and cons. I got into a discussion about this with somebody on another board

What I found interesting was a that they (Hot Rod) did some tests on (Holly brand) disk injectors and they stopped working at 65 psi. The magazine made the statement "that this is predictable for any brand of disc-style injector construction" (see side bar, pg 60)

This other person was offering to sell a set of low impedance disk types for $200. Of course he claimed he had checked them out and they were good to 100 psi. I didn't ask and he didn't volunteer the brand name of his injectors.

My point is that 65 psi isn't unheard of for somebody running a little extra base fuel pressure and 20 psi of boost. That's not exactly the conditions I want to be in and have the injectors shut down.

I have no direct experience with disk type injectors or the info presented above.
Pete Dunham


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Nitro_X Offline
Senior Member
#6
Good tip Pete. Thanks! I doubt I'll ever get that far into the TC performance curve, but you never know. I think Spooler is on the right track with running a good quality fuel injector cleaner through them periodically (which I do anyway, Valvoline Syntec).

Anyway, doing a bit of searching I find that MSD offers replacement peak / hold injectors (MSD PN 2012, 34 lb./hr.). Stainless steel ball and seat style supposedly clog and deposit resistant. Anyone here know anything about MSD? Since I doubt that my engine will ever see enough mods for 300 HP (probably 250 tops optimistically), will 34 lb./hr. be adequate? Can anyone make a brand / size recommendation (I only want to do this once for the next 150 - 200K miles)?

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87 TC, T-5 swap, solid state IVR, fog light relay mod, PST / KYB-AGX, med. red, spoiler, 181K+ Mi's., daily driver, still eating Ricers!
87 TC, T-5 swap, billet quadrant / adj. cable, solid state IVR, fog light relay mod, PST suspension, KYB-AGX fronts, Gas-A-Just rears, K&N cone, billet alum BCV, med. red, 90's wing, polished snowflakes and centers, 195K+ Mi's., daily driver, feeding on ricers!
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Pete D Offline
Administrator
#7
Check the chart. 34s should be close and should allow you to get good performance from the stock computer. There are some unknowns about the chart, like what is base pressure ect. I think the chart may be slightly conservative but don't bet on it. You would probably be safer with 36s. Don't know anything about MSD injectors. Are they low Impedance?

[This message has been edited by Pete D (edited 01-21-2004).]
Pete Dunham


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Nitro_X Offline
Senior Member
#8
Pete, thanks for the chart. You're right, 34 lb/hr is on the low side if I do anything more than slightly radical to the motor. Unfortunately, the MSD's jump from 34 lb/hr to 50 lb/hr and those probably would be too much for the stock EEC curve. They are low impedance (2 ohm) peak and hold (2/.5 amp).

I doubt I'll ever do much besides a Ranger cam, porting, T-3, K&N w/ cold air, Gillis and a 3" exhaust. Actually, I have a totally rebbuilt '86 engine on the stand right now with porting, FMS adj. cam sprocket and a T-3 on it. I want to port the exh. manifold off my donor '87, retube the cooling lines in stainless and put in a roller cam before I do the swap. I'll probably keep the boost at or below 18 PSI in the interest of head gasket longevity. But I need to replace those leaking injectors NOW (I'm tired of looking at the fire extinguisher laying in the passenger side floor board). I'll do some more checking for prices. Maybe you or someone out in TC land can point me in the right direction for brand and best price?
87 TC, T-5 swap, billet quadrant / adj. cable, solid state IVR, fog light relay mod, PST suspension, KYB-AGX fronts, Gas-A-Just rears, K&N cone, billet alum BCV, med. red, 90's wing, polished snowflakes and centers, 195K+ Mi's., daily driver, feeding on ricers!
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TurboCoupe50 Offline
Posting Freak
#9
Quote:Originally posted by Pete D:

What I found interesting was a that they (Hot Rod) did some tests on (Holly brand) disk injectors and they stopped working at 65 psi. The magazine made the statement "that this is predictable for any brand of disc-style injector construction" (see side bar, pg 60)

This other person was offering to sell a set of low impedance disk types for $200. Of course he claimed he had checked them out and they were good to 100 psi. I didn't ask and he didn't volunteer the brand name of his injectors.

My point is that 65 psi isn't unheard of for somebody running a little extra base fuel pressure and 20 psi of boost. That's not exactly the conditions I want to be in and have the injectors shut down.

I have no direct experience with disk type injectors or the info presented above.

Ummm... I have 24lb discs in my 5.0, first I have heard of the disc inj shutting down at 65psi. With the 150 shot of nitrous fuel pressure hits 80-85 psi, and my Ford Racing injectors have hung in there.

Makes no difference at this point, I'm over the nitrous thing. Gonna build a bigger motor



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Three 1988 Turbo Coupes .....
yea one of em has a 5.0 And runs 13.1s......
uhhh make that [email protected] with a 90hp shot of nitrous.
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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Hurff Offline
Senior Member
#10
So you ever read a post and then not feel so good with the info you read....

I am taking my head off to fix a blown gasket, and guess what I find ? The same danged problem. Were the injectors for the 2.3 turbo unique, or were they on any other cars ?

I just keep telling myself there *can't* be much more to fix/clean/replace....

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1987 TC bone stock, still getting the list of needs, but has great promise
1987 TC - RIP
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