North American Turbocoupe Organization



How loud are your injectors?
RC Martin Offline
Posting Freak
#1
I have about 1000 miles on my brown tops and PC1 swap in my 84. I had the injectors cleaned by Cruzin Performance prior to the swap. Three are matched and the odd one out I put in cyl #4. The car runs stronger than ever and chirps the tires in 2nd when I don't think it did before, it has stock exhaust, no IC, 10 psi, rebuilt engine.

The injectors are LOUD. They tick loudly, almost sounds like a knock, but you can only hear it with the hood open. You can feel a solid thud-thud-thud in the FPR or fuel rail, and nothing in the intake manifold, head, or block. Is this normal?
Thunderbird Turbo Coupe, Bright Canyon Red TuTone, Desert Tan Interior; 1 of 7 in this combo in 1984 according to Marti.  1 of 13,361 TCs in 84.
   Rebuilt, 3-Angle Valve Job, SYB37 "OE/Small" Slider Cam
   Full 3" Stinger Exhaust to Flowmaster 40, Gnari FMIC/Recirc/BPV, MBC @ 18psi, RF-E6 Manifold, Remote-Mount TFI, PC1 and Flowed 35# Injectors, Inline Walboro 255HP, Kirban AFPR
   Rebuilt Suspension -- KYB & Energy Suspension
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Pete D Offline
Administrator
#2
My experience is they tend get louder with age. Remember that they all fire at once. It can sound like a knock.
Pete Dunham


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RC Martin Offline
Posting Freak
#3
Yeah it isn't a concerning sound, but it does resemble a tick or light knock. Just wondering since it seems so much louder after going from greens to browns, and the browns I put in were serviced first.
Thunderbird Turbo Coupe, Bright Canyon Red TuTone, Desert Tan Interior; 1 of 7 in this combo in 1984 according to Marti.  1 of 13,361 TCs in 84.
   Rebuilt, 3-Angle Valve Job, SYB37 "OE/Small" Slider Cam
   Full 3" Stinger Exhaust to Flowmaster 40, Gnari FMIC/Recirc/BPV, MBC @ 18psi, RF-E6 Manifold, Remote-Mount TFI, PC1 and Flowed 35# Injectors, Inline Walboro 255HP, Kirban AFPR
   Rebuilt Suspension -- KYB & Energy Suspension
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boboli Offline
Member
#4
I had mine cleaned recently and noticed tonight that I can hear them with hood open , standing by the fender. I'm not too worried. Atleast you know they're working.
1988 turbo tbird, 5spd, 140k, all stock except boost control valve.
1986 dodge omni glh turbo, 111k, my money pit.
1989 mustang Lx 5.0 convertible, tropical yellow/ tan interior, 1of only 144 made, 164k, aod, all stock including overheating TFI!
89 Jaguar XJS convertible, LT1 conversion, now fighting the prince of darkness (aka Lucas electronics)
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Not B Anymore Offline
Administrator
#5
I bought new injectors a few years ago, when I put the new engine in the 'bird. One of them started ticking within a week and has ever since. No effect on performance whatsoever.
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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TurboCoupe50 Offline
Posting Freak
#6
Pete D Wrote:My experience is they tend get louder with age. Remember that they all fire at once. It can sound like a knock.

Actually they fire two & two...
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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Pete D Offline
Administrator
#7
Tom, I understand they are wired and fire in pairs but they still are fired together unless I misunderstood the following sources. My answer, above, is predicated on the info that I put in this post many years ago.

http://natomessageboard.com/ubbthreads.p...Post122524
Pete Dunham


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Jeff K Offline
Administrator
#8
Yes, injectors are fired in pairs, but simultaneously, twice each crank revolution.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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TurboCoupe50 Offline
Posting Freak
#9
Pete D Wrote:Tom, I understand they are wired and fire in pairs but they still are fired together unless I misunderstood the following sources. My answer, above, is predicated on the info that I put in this post many years ago.

http://natomessageboard.com/ubbthreads.p...Post122524

OK Pete but Alan Slocum or not I can't see how they would all fire at once... That would mean at least one cylinder is coming up on exhaust stroke and would be pushing raw fuel out the exhaust... That will not happen in a two & two arrangement...

Till I'm proved wrong, I'm standing on two firing every 180*...
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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RC Martin Offline
Posting Freak
#10
More than one at a time explains why it might be louder relative to other FI cars.
Thunderbird Turbo Coupe, Bright Canyon Red TuTone, Desert Tan Interior; 1 of 7 in this combo in 1984 according to Marti.  1 of 13,361 TCs in 84.
   Rebuilt, 3-Angle Valve Job, SYB37 "OE/Small" Slider Cam
   Full 3" Stinger Exhaust to Flowmaster 40, Gnari FMIC/Recirc/BPV, MBC @ 18psi, RF-E6 Manifold, Remote-Mount TFI, PC1 and Flowed 35# Injectors, Inline Walboro 255HP, Kirban AFPR
   Rebuilt Suspension -- KYB & Energy Suspension
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