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Pickup Truck Exhaust Noise

Old 03-30-19, 12:35 PM
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Pickup Truck Exhaust Noise

Anyone know the type of engine used in pickup trucks which sounds like it has a whirring, hissing whine to it? Generally, these trucks have a larger than normal diameter rear exhaust. Maybe a diesel of some type with higher engine compression? Anyways, they are loud when they pass to the left. Just curious.
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Old 03-30-19, 02:33 PM
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Turbo diesel? Or even supercharged diesel? But probably turbo.

I, myself have been known to emit a hissing whine when under pressure.
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Old 03-31-19, 11:27 AM
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People don't ride Harley Davidson motor bikes muffled, to be quiet, either..


Then there's The "Rolling Coal " guys.. another rather Obnoxious sort...






....

Last edited by fietsbob; 03-31-19 at 12:05 PM.
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Old 03-31-19, 11:32 AM
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Yeah that’s some form of diesel you are hearing. They are often made extra loud on purpose just like motorcycles. When done to the extreme it’s obnoxious. The high pitched whine is the turbo on some diesels.
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Old 04-01-19, 11:30 AM
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Gas motors sometimes have turbos too, fwiw. On a truck, it's probably a diesel tho.
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Old 04-01-19, 11:39 AM
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Yep. It's the turbo.
The" rolling-coal" tools are just a bunch of dummies that think black clouds of inefficiency look cool. It is cool to stop at the gas station daily after-all. They coke up their turbos & cook the bearings in short order from carbon accumulation. So the situation usually sorts it self out.

Real high performance diesel is as clean and invisible as car exhaust. Back when I owned a 400hp, 600ft/lb torque F250, it would get 18mpg and never blew black smoke.

Last edited by base2; 04-01-19 at 11:45 AM.
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Old 04-01-19, 11:48 AM
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^^^^^ +1; rolling coal is quite frowned upon in the diesel pickup forums, as many a young n00b posting inquiries about it finds out the hard way....

The turbo whine is generally no louder than a commercial truck or city bus, usually not as loud. And orders of magnitude quieter than a Harley.
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Old 04-01-19, 12:00 PM
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Originally Posted by base2
Real high performance diesel is as clean and invisible as car exhaust. Back when I owned a 400hp, 600ft/lb torque F250, it would get 18mpg and never blew black smoke.
Perhaps on paper, but for me, personally, it is harder to breathe.

Breathing petrol exhaust isn't exactly pleasant, but you can still more or less breather. With diesel, even perfectly clean/clear diesel, I just feel like I'm not getting any oxygen in my lungs. I've followed many a diesel while riding a motorcycle, even very small displacement diesels, and the sensation is unmistakable (and annoying).
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Old 04-01-19, 12:28 PM
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Oh yeah, I live in Texas so we have a ton of those tools trying to see how much smoke they can make. Often with a bumper or rear window sticker saying "Got Smoke?" Truly obnoxious! I didn't even know there was a term for it.
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Old 04-01-19, 12:43 PM
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In The past Busses had the exhaust like a car @ bumper level , accelerating from a stop, too much oil injected,
Result, Unburned diesel Carbon soot in your face..
newer busses redesigned the piping to come out above the top of the bus..


Detroit Diesel Engines are 2 stroke , to achieve the high ignition pressures
they used mechanical superchargers to push in a lot of air..
Drag racing used those compressors with Petrol & Methanol fuels in 4 stroke engines..





/..

Last edited by fietsbob; 04-01-19 at 03:42 PM.
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Old 04-01-19, 03:23 PM
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Ok, thanks for the feedback on this. Definitely a diesel then come to think of it. If you listen to tractor/trailer rigs they have same sort of exhaust whine/whistle when gearing up under load, except their stacks are pointed towards the sky and not into the curb lane.
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Old 04-04-19, 07:26 AM
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i have seen guys with turbo diesels who cut a whole in the truck bed so their exhaust can go up like a tractor trailer. although that might be better than dumping it out on us as they pass.

that is just silly. i think they are compensating for something




exhaust in a truck bed.
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Old 04-04-19, 07:37 AM
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A stack does make for a slightly shorter exhaust path, but of course, at the expense of usable bed space. And no option for a topper of course.

But dual stacks from a single exhaust pipe (see above), that's definitely compensating.
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Old 04-04-19, 08:15 AM
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Same guys often vape. and then conspicuously blow the smoke out the window while sitting at red lights. And yeah, lots of compensating for something going on, for what, I have no clue, but it apparently it's something makes sense to them at some unfathomable level.
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Old 04-04-19, 08:16 AM
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Originally Posted by Lemond1985
Same guys often vape. and then conspicuously blow the smoke out the window while sitting at red lights. And yeah, lots of compensating for something going on, for what, I have no clue, but it apparently it's something makes sense to them at some unfathomable level.
Oh good grief don't get me started on the obnoxious vape clouds! Also caused by people intentionally modifying the device to produce said result btw.
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Old 04-04-19, 10:11 AM
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The vape clouds are a distinct improvement from cigarette smoke. I’ll tolerate it.
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Old 04-04-19, 10:26 AM
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Next reality-trumps-Onion invention - e-cig that rolls coal....
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Old 04-04-19, 10:36 AM
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Originally Posted by Darth Lefty
The vape clouds are a distinct improvement from cigarette smoke. I’ll tolerate it.
Yes except with one caveat: Smokers for the most part were less conspicuous because of how restricted they were. Vapers seem to think they can do it anywhere because "It's completely harmless you know!"
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Old 04-04-19, 02:22 PM
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my ride ...

77 kW of fury (1.2l turbo petrol).

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Old 04-04-19, 02:33 PM
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Also, what you heard was turbo whine. Even my golf does it.

Here is my buddies Golf in Germany, good turbo whine there (yeah that's 3sec between 60mph and 120mph while rolling.)

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Old 04-04-19, 02:48 PM
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Originally Posted by acidfast7
my ride ...

77 kW of fury (1.2l turbo petrol).

https://www.youtube.com/watch?v=AxhY5JDmTo8
For decades upon decades the auto industry has been stuck at 60hp per liter & that's just the way it was. 85 horse power per liter is an impressive 30% improvement over the old tech.

Combine that with the 50% reduction in vehicle weight from those 1970's land yauchts we thought were cool.

I know you meant "pure fury" in a snarky way, but modern cars are so much better in every conceivable metric it's no wonder people keep buying them.

Hardly anybody, not even those on the C&V subforum, goes out looking for a 1933 Cleveland Dutchie bike.

Seriously, now is a great time to be alive.
(Discounting the VW diesel emissions scandal, of course.)
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Old 04-04-19, 03:03 PM
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An intermittent high pitched squeal can also be either a power steering pump, or a slipping fan belt.
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Old 04-04-19, 03:15 PM
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^^^^ That's a squeal, from from the front (or wherever the engine is located), not a whine, heard from the exhaust.
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Old 04-04-19, 10:50 PM
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Originally Posted by base2
For decades upon decades the auto industry has been stuck at 60hp per liter & that's just the way it was. 85 horse power per liter is an impressive 30% improvement over the old tech.

Combine that with the 50% reduction in vehicle weight from those 1970's land yauchts we thought were cool.

I know you meant "pure fury" in a snarky way, but modern cars are so much better in every conceivable metric it's no wonder people keep buying them.

Hardly anybody, not even those on the C&V subforum, goes out looking for a 1933 Cleveland Dutchie bike.

Seriously, now is a great time to be alive.
(Discounting the VW diesel emissions scandal, of course.)
I'm a huge car guy. My first car was a toyota supra turbo and it made well over 100bhp/l when I was finished. The golf is probably 120bhp at the crank out of 1.2l. Still gets about 40+ mpg (US) in mixed driving.

However, it just doesn't make sense over (metro Europe) due to the excellent public transport.

Now, that I live in the most dense city in Western Europe, parking is at a premium (cars lining both sides of every street), so we went with the cheapest Golf for only £9k with 6k miles. It's a good footprint and parks easily.

The newer generation Golf (ours is a Golf Mk6, so the new Mk7), used a 1.0L petrol turbo rather than a 1.2l to produce better torque and power curves!

Dense living area

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Old 04-04-19, 11:32 PM
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Originally Posted by RidingMatthew
i have seen guys with turbo diesels who cut a whole in the truck bed so their exhaust can go up like a tractor trailer. although that might be better than dumping it out on us as they pass.

that is just silly. i think they are compensating for something



Based on how these smell, I can only guess it's necessary to compensate for the garbage and poop bags people throw in
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