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I have new( refurbish) injectors from South bay injectors and they work fine but they make a lot of noise ( ticking) sounds.
It sounds like an old fiat and i just cant live with that
I want to buy some new one but dont want to buy some again that sounds like crap. Anyone have some advice on what to buy ?
Have you contacted SouthBay about them? I bought a set from them and yes they are noisier than the stock as in ticking. I just close my hood and move on. I know it may be annoying but IDK if effects anything.
Give them a call and see what they say. Other members on here said the same as you.
I've noticed the same thing with my South Bay injectors. Click Click Click. But if you put a mechanics stethoscope up the the injectors they are not that loud. If you put it on the fuel pressure regulator it's noisy. I've come across some threads here on Thirdgen that say the Bosch injectors close so much better and faster than the stock Multecs that there is some resonance that causes the FPR to click. I think I believe this theory.
Do some research guys, the bosch lll's are notorious for the clicking sound. It's not just our injectors. The ticking noise has nothing to do with the efficiency or the function of the injector. If we could eliminate the noise we would. Some are quiet some are not and we are unable to hear it when they are on the bench
Do some research guys, the bosch lll's are notorious for the clicking sound. It's not just our injectors. The ticking noise has nothing to do with the efficiency or the function of the injector. If we could eliminate the noise we would. Some are quiet some are not and we are unable to hear it when they are on the bench
I love mine, best thing I could have done for it! Close the hood and move on!
I've noticed the same thing with my South Bay injectors. Click Click Click. But if you put a mechanics stethoscope up the the injectors they are not that loud. If you put it on the fuel pressure regulator it's noisy. I've come across some threads here on Thirdgen that say the Bosch injectors close so much better and faster than the stock Multecs that there is some resonance that causes the FPR to click. I think I believe this theory.
If you search the forums, I think I remember a post where somebody had success quieting it down with a retrofitted fuel pressure pulsation damper from a Honda.
I have the South bay injectors with the machined aluminum adapters on the bottom. I wonder if older versions of their Bosch III's that used the extra orings made the same noise? Its possible that the extra oring suspended the injector between the rail and intake with a bit more rubber isolation may make them quieter. Just a thought though.
You guys can do a search on noisy bosch injectors or go onto the corvette forum and you will find that people have the same issue with the bosch lll injectors from another company. Unfortunately it's the nature of the beast...sorry guys...if we could fix it we would. Once again,, feel confident that although they are loud there is absolutely nothing wrong with the injectors.
I did a little more digging on these fuel pressure dampers. It seems that a lot of newer cars have them. They are simply there to quiet down the noise created when the better performing injectors open/close. I even came across something that said some high end cars like BMW and Mercedes have several of them incorporated into the fuel lines at various locations to really quiet things down in the cabin.
Read this post starting with #29. Member gp90gta has a possible solution on post #48. He retrofitted a fuel pressure damper to the fuel line under the hood where the solid fuel line from the tank connects to the line that goes up to the rail.
I used a bunch of Earls blue anodized aluminum fittings and adapters and got it to mate up to the shrader fitting on the TPI fuel rail. Well...if it did anything, it was very nominal in quieting down the noisy FPR and injectors.
Although I agree that the Bosch injectors from South Bay are without a doubt much better than the stock Multecs. My throttle response and idle are much much better now, but the noise they make is absolutely embarrassing.
here is a quote from another forum regarding the noise bosch lll injectors that are not from SouthBay:
"I just had the heads freshened up with LT4 springs, new seals, pressure tested then I installed 1.6 RR's, hardened rods, guide plates, new Delco rapid-fires. I have adjusted the valve lash 3 times and I can put my mech stethoscope on the VC and tell that it's not coming from in there.
It's almost embarassingly loud at stop lights."
Mine (from SB) are a tad noisy...I'd noticed it when I first fired it up.
My daughter has been driving the car since, but yesterday I fired it up and at idle with the hood down (no hood insulation installed) and the window open, I could barely hear them.
What abnormal engine noise do you pick up on? Keep in mind this video is made inside a small garage with a lot of echo using a crappy cell phone camcorder.
Could be why then...I wasn't meaning "abnormal"...just the general sound of the engine running is louder than I'd expect...with out someone talking to adjust to the proper sound level...i/e I turn the volume down on my computer to try and mimic "normal engine sound volume" and I can barely hear your injectors.
I'm not discounting that yours could be annoying to you, just trying to get a reference is all.
It's loud enough that I can hear it over my exhaust with the windows up driving down the road with wind noise.
I'll take another video of it with the hood down and outside the garage. It may clean up the audio outside with no concrete floor and walls for the sounds to bounce off of.
Also when the hood is down the injector clicking seems to be directed down under the car. So its equally as annoying with the hood up or down.
I'm seriously considering going back to Multecs. Its that bad.
Southbay08. If the Bosch 3's are known to be so loud, maybe you can recommend a different injector. I'm not building a race car here so I'm just looking for something reliable for my sunny weekend Camaro.
To be honest with you...approx. 95% of our inventory are bosch injectors. They are efficient and reliable.
IMO I would stay away from the accels. You can try Lucas, never heard anything negative about them.
If you want, we have the older metal body ford injectors that we can give you a really good deal on, however most of them are pintle type. I can take a look at my inventory when I get to the shop tomorrow and let you know what we have. They will be completely flow test and matched and will come with the 3 year warranty that we offer.
Thanks. What are the disadvantages of the "pintle" type of injectors? And I was of the understanding that the Accel and Trick Flow injectors were just re-badged Lucas disc injectors that have a 'pencil' style spray pattern that is not really all the great for the street.
I took another video. It's still in the garage though. Up on blocks to fix a coolant leak. I did a bit of a walk around to show the sound from different spots. You can hear it with the hood up, down, side, underneath and inside the car.
Thanks. What are the disadvantages of the "pintle" type of injectors? And I was of the understanding that the Accel and Trick Flow injectors were just re-badged Lucas disc injectors that have a 'pencil' style spray pattern that is not really all the great for the street.
Sorry for the delayed response. Actually the pintle type injector has more of a stream for a spray pattern because it is just one opening for the fuel to spray through the little "pin" pintle. They work just fine however it is easier for them to clog up. You are correct about the Lucas and the accel, but accel also has an injector that is bosch style...I would still stay away from them. The bottom line is that there are not many injectors to choose from. I have the Genll bosch with a 4 spray in stock. If I can help you in anyway, please give us a shout.
I forgot I had a set of these. I pulled them from a junkyard car. They appear to be Accel injectors. I'm not sure which style they are. I'm guessing they can be serviced? They have what looks like a 3 hole spray nozzle but one of the 8 seems to be damaged. Is this a serviceable injector with this kind of damage?
Could a factor be that the TPI injectors fire together in batch mode, and that the Bosch injectors are made for sequential injection.
That it, the TPI injectors flow 4 times as much in one big quirt, less frequently. That is, the sequential injectors have a greater number of smaller flows?
I've had Bosch/RP injectors cleaned and flow-matched at other places, and installed NOS injectors (still in the sealed plastic bags) and they ARE louder than modern injectors. There is nothing wrong with them.
If it really bothers you, pop a valve cover and loosen a rocker nut a turn or two. The injector noise will no longer disturb you.
I'm going to throw a set of new Accel/Lucas injectors on and do a noise comparison. I'm desperate to shut this noise up. I'll let you all know how another $300 in experimenting turns out.
I threw the Accel injectors on today. It's my understanding that Standard Motor Products actually makes these for Accel and Lucas. Anyway...it's waaaay quieter than the Bosch III's. I can't hear them inside the car. I'm sure the Bosch injectors are probably all around better, but I don't really notice any difference between them and the new Accels. Throttle response is good, car idles fine and has plenty of get-up-and-go.
Thanks for posting. If you have any probs with the Accels let us know. I have been considering a set of Accels for mine too.
Originally Posted by greenyone
I threw the Accel injectors on today. It's my understanding that Standard Motor Products actually makes these for Accel and Lucas. Anyway...it's waaaay quieter than the Bosch III's. I can't hear them inside the car. I'm sure the Bosch injectors are probably all around better, but I don't really notice any difference between them and the new Accels. Throttle response is good, car idles fine and has plenty of get-up-and-go.
Me too I've just bought Bosch III 22lbs injectors and they make so much noise it ruins the pleasure to hear a V8 idling.
However I have to say that they work fine and South Bay are very reliable and freindly. But I have to admit that I regret my purchase. If I knew those injectors were that noisy, I would have chosen other ones.
Here's a video: It's seems even noisier than the orher ones on this topic.
Just had an idea..maybe experiment this weekend. Go to Lowes and buy a 1/2" Pipe sleeve Insulation Foam Tube and cut 2-3" pieces and slide down around injector and see if it quiets them down.
I personally don't worry about it, turn up the tunes.
Thanks for the tip but I would be afraid that injectors eat up and toast the resistance.
You know what. My car was broke down for quiet a while now. And now, swapping to those injectors it's fine so I guess I'm happy. Maybe next time I'll try other injectors but for now it'll do.
I also swapped out from the bosch injectors to the Accels. The bosch were ridiculously loud. The Accels are much quieter and the car runs great, no difference in how it feels and the engine can now rev above 2k without it sounding as another member said, a sewing machine(very accurate description).
Just had an idea..maybe experiment this weekend. Go to Lowes and buy a 1/2" Pipe sleeve Insulation Foam Tube and cut 2-3" pieces and slide down around injector and see if it quiets them down.
I personally don't worry about it, turn up the tunes.
I think you'd need to spray foam the entire engine bay to quiet them down. They are just noisy injectors and the clicking resonates through the fuel lines, fuel rails and pressure regulator. I don't think there is a fix. It's just a - deal with the noise or choose a different injector issue.
What up guys i am new here and i whanted to say thanks for all the info. You guys provide. So far I have been able to restore my beast. Slowly but surely with all the info within the forum. I am now waiting for my bostch lll injectors from southbay to completely restore my ride. Thanks again for all the great help.
I've been running Bosch III's since I got my car and are they are annoyingly/distractingly loud. The idle of the car is 100% ruined by the injector noise.
It's fine for my daily driver but if I showed my car in any capacity it would not be acceptable. Honestly, I'll be trying another brand of injector in the future, even if they're more expensive.
10-07-2014, 09:02 AM
Boy you nailed that Rusty!! 
