Ride or Never!

Next time someone tells you loud pipes saves lives ...asked ai if fire depts point any siren rearward or utilize loud exhausts to be heard? Short answer is no. And still they sometimes get into accidents with idiot drivers.
#motorcycle #exhausts

## Do Any Sirens Point Backward?

**Generally, no.** Sirens are not intentionally pointed backward. The primary goal of an emergency vehicle's siren is to clear the path *ahead* of the truck so it can safely navigate through intersections and traffic.

However, sound naturally wraps around the vehicle, and because sirens are so loud ($120+\text{ dB}$), motorists behind the fire truck can still easily hear it.

There are two minor exceptions where sound is directed rearward:

* **The "Backwash" of Sound:** The physical shape of the truck's body acts as a giant reflector. Sound waves hitting the front cab bounce backward, sending a significant amount of noise along the sides and rear of the vehicle.
* **Rear-Facing Warning Speakers:** Some highly specialized command vehicles or highway safety trucks feature rear-facing public address (PA) speakers. These aren't standard sirens; instead, they are used to broadcast voice commands or specific warning tones to drivers approaching a scene from behind.

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## Do They Install Loud Exhausts or Mufflers?

Fire trucks do not use "loud exhausts" or aftermarket performance mufflers to make the engine louder on purpose. In fact, the goal is usually the exact opposite.

### 1. Heavy-Duty Stock Mufflers

Fire apparatus use massive, highly restrictive diesel particulate filters (DPF) and industrial-grade mufflers. Because the diesel engines in these trucks are enormous (often 13 to 15 liters), an unmuffled exhaust would create a deafening, low-frequency roar.

### 2. The Communication Factor

Firefighters need to be able to talk to each other and hear radio dispatches clearly while en route to an emergency. A loud, droning exhaust would interfere with their headsets and increase crew fatigue.

### 3. The Only Exception: The Exhaust Brake

While the exhaust system itself is quiet, fire trucks often use a loud auxiliary braking system called a **Jake Brake** (compression release engine brake) or an exhaust brake.

* When the driver lifts their foot off the accelerator, the engine alters its valve timing to use the engine's own compression to slow down the massive vehicle.
* This creates a distinct, loud, machine-gun-like chattering sound from the exhaust. It isn't for warning people—it is strictly used to save the truck's mechanical brakes from overheating.

2 months ago (edited) | [YT] | 0

Ride or Never!

Happy July 4th. Had to pull the trigger on a new edc, TRM Neutron 2 Titanium Frame Lock with 80s Camo Fat Carbon Fiber show side in Magnacut. 100% made in the USA. Even the 80s camo carbon. I grew up in the 80s. Nickelodeon, MTV, graffiti, denim 3 ring binders and my skateboard.

Big shout to ‪@doodysdaggers‬​​​ Knife and EDC channel. I recently sold all my Benchmade, Spyderco and Chinese brands like Civivi. wanted to find a "one and done" premium semi custom USA made knife and his plethora of down to earth and real usage tests helped me a lot. I didn't know who TRM was until a few months ago. Doody's TRM Atom video and cut test was the 1st intro to the brand for me. ‪@trmknives‬​​

Here was the latest video where he showed the new frame lock version that just came out.

https://youtu.be/ueaf6lf0Q8g

And "Neutron 2 in top 5 of greatest EDC Knives" https://youtu.be/pGwf2Sc8rXE

Hide your wallet now!

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1 year ago (edited) | [YT] | 1