Engine flutter? Normal?
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Re: Engine flutter? Normal?
Originally Posted by billvp
mine has the same fluttering/wheezing sound that is most prominent at 3/4+ throttle when I'm passing someone ... it sounds like it is coming from the passenger side, and sounds kind of like if a piece of paper was stuck in a bicycle spoke, then when you are going fast, it hits the wheel brace part repeatedly
I can't hear it with the windows up and the radio on, but definitely hear it with the top down. I'm fairly certain it did not make the sound when stock. My car has 20k miles on it.
it doesn't make the sound at idle
I did a search on "bad bearing" noises, and it sounds nothing like the "rocks rattling around" sound.
I can't hear it with the windows up and the radio on, but definitely hear it with the top down. I'm fairly certain it did not make the sound when stock. My car has 20k miles on it.
it doesn't make the sound at idle
I did a search on "bad bearing" noises, and it sounds nothing like the "rocks rattling around" sound.
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Re: Engine flutter? Normal?
Originally Posted by satellite
Bingo...this has to be the same sound I am hearing. I'm still thinking it might be the bearing, but I agree it sounds nothing like other "bad bearing" videos. I posted the videos above to possibly show where the sound is coming from...but...I can't really see the SC making that noise when spinning in one direction consistently.
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Re: Engine flutter? Normal?
Originally Posted by mjgroves
Yep, I have to agree with you. Paper in bike spokes sounds like another perfect description. We have got to figure out what this is, it drives me nuts.
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Re: Engine flutter? Normal?
Originally Posted by satellite
Chances are it's just injector noise...lol...apparently it's a common theme for the newbies whining about it. However, I will be looking into it more this week and weekend.
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Re: Engine flutter? Normal?
Hey guys...After reading through all the decriptions of the noise you're hearing, It kind of sounds to me like a small exhaust leak...especially the fact that it gets louder with increased throttle but not necessarily increased rpm. I've had header leaks on some of my cars in the past that were most noticible if you had the car in a semi lug and rolled the throttle on fairly agressively. As the cylinder pressure increased so did the noise.
Maybe something to look at...Check out your exhaust manifolds?...
Maybe something to look at...Check out your exhaust manifolds?...
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Re: Engine flutter? Normal?
Originally Posted by FireAnt
Hey guys...After reading through all the decriptions of the noise you're hearing, It kind of sounds to me like a small exhaust leak...especially the fact that it gets louder with increased throttle but not necessarily increased rpm. I've had header leaks on some of my cars in the past that were most noticible if you had the car in a semi lug and rolled the throttle on fairly agressively. As the cylinder pressure increased so did the noise.
Maybe something to look at...Check out your exhaust manifolds?...
Maybe something to look at...Check out your exhaust manifolds?...
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Re: Engine flutter? Normal?
Well, describe the noise. Does it sound like bb's in a coffee can? sandpaper?
A bearing going bad has a pretty distinct sandy sound.
As far as the flutter, when the clutch on the SC engages, the motor loses power due to the parasitic losses from the energy required to turn the supercharger. You might be feeling that but also the first time the lobes start spinning they have to pressurize all of the air between the supercharger and the intake valves. This sometimes can have a cluttery compressor surge like sound to it, since basically the supercharger is fighting this solid wall of air
A bearing going bad has a pretty distinct sandy sound.
As far as the flutter, when the clutch on the SC engages, the motor loses power due to the parasitic losses from the energy required to turn the supercharger. You might be feeling that but also the first time the lobes start spinning they have to pressurize all of the air between the supercharger and the intake valves. This sometimes can have a cluttery compressor surge like sound to it, since basically the supercharger is fighting this solid wall of air
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Re: Engine flutter? Normal?
Originally Posted by Infinite
Well, describe the noise. Does it sound like bb's in a coffee can? sandpaper?
A bearing going bad has a pretty distinct sandy sound.
As far as the flutter, when the clutch on the SC engages, the motor loses power due to the parasitic losses from the energy required to turn the supercharger. You might be feeling that but also the first time the lobes start spinning they have to pressurize all of the air between the supercharger and the intake valves. This sometimes can have a cluttery compressor surge like sound to it, since basically the supercharger is fighting this solid wall of air
A bearing going bad has a pretty distinct sandy sound.
As far as the flutter, when the clutch on the SC engages, the motor loses power due to the parasitic losses from the energy required to turn the supercharger. You might be feeling that but also the first time the lobes start spinning they have to pressurize all of the air between the supercharger and the intake valves. This sometimes can have a cluttery compressor surge like sound to it, since basically the supercharger is fighting this solid wall of air
In the first part of your paragraph the SC engaging, I absolutely recognize/feel that...and this sound is totally separate from that.
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Re: Engine flutter? Normal?
well, its not about how much boost, theres no bypass valve on srt-6's
its more than likely just harmonics of the air initially being pressurized, or at partial throttle the supercharger is trying to compress more air than its receiving, that too could cause a compressor surge like sound. almost a squeaky wheezy flutter
its more than likely just harmonics of the air initially being pressurized, or at partial throttle the supercharger is trying to compress more air than its receiving, that too could cause a compressor surge like sound. almost a squeaky wheezy flutter
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Re: Engine flutter? Normal?
Originally Posted by FireAnt
Hey guys...After reading through all the decriptions of the noise you're hearing, It kind of sounds to me like a small exhaust leak...especially the fact that it gets louder with increased throttle but not necessarily increased rpm. I've had header leaks on some of my cars in the past that were most noticible if you had the car in a semi lug and rolled the throttle on fairly agressively. As the cylinder pressure increased so did the noise.
Maybe something to look at...Check out your exhaust manifolds?...
Maybe something to look at...Check out your exhaust manifolds?...
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Re: Engine flutter? Normal?
Got to take the car out yesterday and drive it pretty much the whole day. Did a lot of "spirited" driving...and noticed that as the car warmed up and got driven harder...the sound started going away. Not really went away entirely, just blended in better with the engine noise and exhaust tone...very wierd.
I'm getting a nice sound recording setup here shortely and I WILL record this. I know I'm not going crazy...haha...
I'm getting a nice sound recording setup here shortely and I WILL record this. I know I'm not going crazy...haha...
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Re: Engine flutter? Normal?
SOUND CLIPS ADDED!!!!!
I'm still getting used to this high quality recorder...so might have you adjust your volume, but you can hear the flutter usually earlier on in the acceleration. Goes away as the exhaust gets louder. Does this help? I'm leaning towards possible exhuast leak.....
Also, isn't the SC whine pretty quiet for mods (NW CAI, C3 pulley, LET tune...etc.)?
Windows Up:
SRT-6 flutter (windows up) - SRT-6 noise when under load, windows up, "flutter", also SC whine seems very quiet for NW CAI and C3 pulley.
Windows Down:
SRT-6 flutter (windows down) - windows down, under 40 mph in 2nd gear
I'm still getting used to this high quality recorder...so might have you adjust your volume, but you can hear the flutter usually earlier on in the acceleration. Goes away as the exhaust gets louder. Does this help? I'm leaning towards possible exhuast leak.....
Also, isn't the SC whine pretty quiet for mods (NW CAI, C3 pulley, LET tune...etc.)?
Windows Up:
SRT-6 flutter (windows up) - SRT-6 noise when under load, windows up, "flutter", also SC whine seems very quiet for NW CAI and C3 pulley.
Windows Down:
SRT-6 flutter (windows down) - windows down, under 40 mph in 2nd gear
Last edited by satellite; 06-10-2010 at 06:24 AM.
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Re: Engine flutter? Normal?
The reason I am leaning towards exhaust leak (at the headers/manifold) is that my truck just started leaking badly from the headers and it's a fairly similar noise....here is that noise...as you can tell MUCH more prominent....
What are the chances that BOTH of my cars get the same issue at the same time...
be careful...louder clip
99' Dakota R/T Exhaust Leak at driver's side header - Most likely gasket is just completely bad from header bolts working their way out....
What are the chances that BOTH of my cars get the same issue at the same time...
be careful...louder clip
99' Dakota R/T Exhaust Leak at driver's side header - Most likely gasket is just completely bad from header bolts working their way out....
Last edited by satellite; 06-10-2010 at 06:17 AM.
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Re: Engine flutter? Normal?
Yep, that's the sound I hear. Not only is it annoying, but it makes the car sound like its 30 years old. It's more prevalent at low RPM in a higher gear, but as the engine noise gets louder due to higher RPM, you can't hear it as much.
My transmission fluid is leaking so I need to take the car in for service anyway. I'll tell them about the flutter and see what they come up with.
My transmission fluid is leaking so I need to take the car in for service anyway. I'll tell them about the flutter and see what they come up with.
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Re: Engine flutter? Normal?
If it's an exhaust leak... and I'm not certain how you would do this on the 6, but when my Diesel Truck had a difficult to pinpoint exhaust leak, they did a smoke test. Used the exhaust back pressure sensor bung to inject smoke from smoke machine. I've also used the old rubber hose (3/4"or 1") stethescope to listen for leaks, but difficult in the newer tightly compact engine compartments. Hope you find it. Good luck.
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Re: Engine flutter? Normal?
Originally Posted by mjgroves
Yep, that's the sound I hear. Not only is it annoying, but it makes the car sound like its 30 years old. It's more prevalent at low RPM in a higher gear, but as the engine noise gets louder due to higher RPM, you can't hear it as much.
My transmission fluid is leaking so I need to take the car in for service anyway. I'll tell them about the flutter and see what they come up with.
My transmission fluid is leaking so I need to take the car in for service anyway. I'll tell them about the flutter and see what they come up with.
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Re: Engine flutter? Normal?
well i bought my car about two months ago and heard the problem when I first got the car and thought it was sc, did not think much of it. so like a week ago my alternator went out and let tell you its a tight fit going in and out, but anyway after all back together and start it up and no more noise! and that might be the cause of the surging the other people are having, just my two cents, good look, oh bye the way you can get your alternator check out at almost any parts store, good luck