Wierd sounding diesels!!!
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Senior User
Joined: Aug 2006
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From: Roseburg, Or
Wierd sounding diesels!!!
Once in a while around town Ill here either Dodge or Ford diesels that make a weird like fluttering noise when they drive by. Its not the normal turbo whistle sound that my diesel makes. The best I can explain it is like a FLUTTERING. Is this caused by different turbos or exhausts, or from older trucks or what. Just wondering.
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Joined: Oct 2006
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It's compressor surge. Without going into really technical details about compressor maps (which would bore just about every one of you) it generally happens when your turbo is trying to push move more air than your engine will accept. This can happen under very low throttle conditions, or if you have a large turbo for the size/efficiency of the engine.
The fluttering occurs because the compressor wheel is actually stopping while trying to build boost - compressor surge is generally bad for turbochargers, too :-o If severe enough, you can beat bearings and shafts up really badly.
If you can imagine, it's kind of like dead-heading a water or fuel pump, except with air instead of liquid.
Blow-off valves are designed to prevent this, but they're generally not widely used on diesel trucks.
The fluttering occurs because the compressor wheel is actually stopping while trying to build boost - compressor surge is generally bad for turbochargers, too :-o If severe enough, you can beat bearings and shafts up really badly.
If you can imagine, it's kind of like dead-heading a water or fuel pump, except with air instead of liquid.
Blow-off valves are designed to prevent this, but they're generally not widely used on diesel trucks.
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Which part are you disputing? Compressor maps *are* boring. Compressor surge is bad. BOV's aren't widely used on diesel trucks.
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Thread Starter
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Senior User
Joined: Aug 2006
Posts: 333
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From: Roseburg, Or
What i am talking about is the actual exhaust note that these trucks have. I mean when they drive by its a constant sound, not just once in awhile. Mine has the diesel engine sound with the turbo whistle, these have this wierd fluttering sound. It is possible its the 7.3's I never really looked that closely, just curious.
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
I'm not sure what you mean?
Most straight 6 engines have an interesting exhaust note compared to other engines. You seem to be able to hear the individual pulses either, and the way they are timed it creates an odd sound. I personally like the sound of it.
YouTube - 2005 Dodge Cummins up this Toyota Tundra 's A$$
Like around 10 seconds or so?
Most straight 6 engines have an interesting exhaust note compared to other engines. You seem to be able to hear the individual pulses either, and the way they are timed it creates an odd sound. I personally like the sound of it.
YouTube - 2005 Dodge Cummins up this Toyota Tundra 's A$$
Like around 10 seconds or so?
Resident smarta$$
Joined: Aug 2006
Posts: 4,929
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From: Oaks,PA
My truck does that under part throttle, like if I'm trying to drive thru town without drawing too much attention to myself ( try that straight-piped with 5"stacks
)
??? Troll?
)
Oh Is That Right Smarty Pants?!?!?!?
