I just got a remanufactured engine and had them install new fuel injectors. It runs like a champ but the injectors tick kind of loud. I was told this is normal BUT I would really like it to be more quiet. Is there anything I can do to quiet them down?
Quiet New Fuel Injectors?
- Thread starter kenpoed
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Marvel Mystery Oil.
JHZR2
Staff member
What kind of an engine? Bosch injectors? The bosch injectors on my 91 BMW tick, so I replaced them, and the new ones ticked exactly the same...
Yes, they're pretty loud especially in Hondas. Normal, hey at least it runs well.
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If it is a Honda motor, they normally sound like sewing machines in the head...
You should hear my b17 with huge profile cams and very stiff valve springs on a cold start...
You should hear my b17 with huge profile cams and very stiff valve springs on a cold start...
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Thats the norm esp in japanese motors. Try different synthetic oil might quiet it dwn a lil bit. PP or PU quieted dwn my 11 Mazda 3 - 2.5L which runs great regardless!
Injectors tick.
It's a fundamental fact.
They have a spring-loaded pintle. The coil opens them against the fuel pressure, and they tick. The spring and pressure slams the pintle closed, and they tick.
Single pintle injectors (as that BMW used) tick loudly. The updated multiple-pintle (e.g. 4 pintle) designs use smaller, lighter pintles and make less noise. But still enough to be noticeable.
It's a fundamental fact.
They have a spring-loaded pintle. The coil opens them against the fuel pressure, and they tick. The spring and pressure slams the pintle closed, and they tick.
Single pintle injectors (as that BMW used) tick loudly. The updated multiple-pintle (e.g. 4 pintle) designs use smaller, lighter pintles and make less noise. But still enough to be noticeable.
how would motor oil make injectors quieter??
Originally Posted By: kenpoed
I just got a remanufactured engine and had them install new fuel injectors. It runs like a champ but the injectors tick kind of loud. I was told this is normal BUT I would really like it to be more quiet. Is there anything I can do to quiet them down?
Ask TRAV.
I just got a remanufactured engine and had them install new fuel injectors. It runs like a champ but the injectors tick kind of loud. I was told this is normal BUT I would really like it to be more quiet. Is there anything I can do to quiet them down?
Ask TRAV.
Install some sound insulation under your hood. Dynamat
Can you post year, make, model and engine? To determine what is "normal" we need to know what injector type is being used.
The injector type, pintel, disc or bsll, injector body material and location and material in the intake or head all play a part in noise to some degree.
The injector type, pintel, disc or bsll, injector body material and location and material in the intake or head all play a part in noise to some degree.
JHZR2
Staff member
Not to hijack, but how about the injectors (bosch) on a 91 BMW 318i M42 engine? Loudest injectors Ive ever heard!
05 honda Accord EXL v6 3.0 VTEC
Originally Posted By: kenpoed
05 honda Accord EXL v6 3.0 VTEC
Those are a plastic bodied Denso IIRC 6 hole disc type. These are normally a nice quiet injector with just a slight ticking sound but nothing at all objectionable.
Does your engine have a foam backed plastic cover or just a plain one?
Were these new Denso units, aftermarket new or so called remans?
Originally Posted By: JHZR2
What kind of an engine? Bosch injectors? The bosch injectors on my 91 BMW tick, so I replaced them, and the new ones ticked exactly the same...
These are an older pintel type and tend to be noisy, if i have a customer that finds them too loud i upgrade them with later Bosch disc units with compatible connectors.
Pintel types atomize the fuel very well so the function is good even if they are somewhat louder.
05 honda Accord EXL v6 3.0 VTEC
Those are a plastic bodied Denso IIRC 6 hole disc type. These are normally a nice quiet injector with just a slight ticking sound but nothing at all objectionable.
Does your engine have a foam backed plastic cover or just a plain one?
Were these new Denso units, aftermarket new or so called remans?
Originally Posted By: JHZR2
What kind of an engine? Bosch injectors? The bosch injectors on my 91 BMW tick, so I replaced them, and the new ones ticked exactly the same...
These are an older pintel type and tend to be noisy, if i have a customer that finds them too loud i upgrade them with later Bosch disc units with compatible connectors.
Pintel types atomize the fuel very well so the function is good even if they are somewhat louder.
Just a plasticmcover and I am guessing aftermarket injectors
If I asked the, to put densos in it, do you think it would make a difference? How much labor time is that? Also, would a foam backed dampen sound?
Thanks
If I asked the, to put densos in it, do you think it would make a difference? How much labor time is that? Also, would a foam backed dampen sound?
Thanks
You say the engine runs well but these injectors are just noisy, are they a lot louder than the ones that were in the original engine?
Do you still have the originals? These are a good unit and cleaning them works well to bring them into like new condition.
Some aftermarkets are fine, Standard, BWD, Lucas are all made by the same company, SMP and are some of the better ones.
Others found on ebay and no name brands are likely Chinese manufacture and the quality is all over the place, the sad part many of these knock offs are even marked correctly.
Sorry without having them in my machine and listening to them next to OEM there is no way i can say if they are louder or not or even what they are.
You can definitely add some sound deadening foam to the under side of the cover in the areas over the injectors and under the hood and firewall.
On that engine its not bad to get at the injectors, they are under the plenum, a couple of hours should do it.
Is it worth swapping them out? Like i said don't know how loud they are and what you would gain, if they are so loud you can hear them outside the car then that would drive me nuts also and they would be gone yesterday.
If its just normal ticking then no i wouldn't.
Find a car like yours with the same engine and listen to it to get a better idea of what normal is.
If you go with foam use a foam designed for this application, it is heat and fire resistant and has a metallic layer (it use to be lead), something like this..
http://www.defender.com/product3.jsp?path=-1|311|2349105&id=96141
Do you still have the originals? These are a good unit and cleaning them works well to bring them into like new condition.
Some aftermarkets are fine, Standard, BWD, Lucas are all made by the same company, SMP and are some of the better ones.
Others found on ebay and no name brands are likely Chinese manufacture and the quality is all over the place, the sad part many of these knock offs are even marked correctly.
Sorry without having them in my machine and listening to them next to OEM there is no way i can say if they are louder or not or even what they are.
You can definitely add some sound deadening foam to the under side of the cover in the areas over the injectors and under the hood and firewall.
On that engine its not bad to get at the injectors, they are under the plenum, a couple of hours should do it.
Is it worth swapping them out? Like i said don't know how loud they are and what you would gain, if they are so loud you can hear them outside the car then that would drive me nuts also and they would be gone yesterday.
If its just normal ticking then no i wouldn't.
Find a car like yours with the same engine and listen to it to get a better idea of what normal is.
If you go with foam use a foam designed for this application, it is heat and fire resistant and has a metallic layer (it use to be lead), something like this..
http://www.defender.com/product3.jsp?path=-1|311|2349105&id=96141
Trav: great info, thanks!
To a degree,it is a statement about the overall tune of the engine, that a solenoid click is your worst trouble. If I had realized that EFI was so much easier than carbs, I wouldn't have avoided it so long. It is just relays and voltage and stuff, and not 'zactly rocket surgery. Better than that, is that when it works, it tends to stay working. Never been able to say that about a carb.
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