You’ve heard the dreaded “hissing noise,” but how to quiet exhaust for inspection? In fact, it’s a relatively easy process. Simply take a small rubber hose, move it around the exhaust and listen for the noise. If the noise is still too loud, you’ll need to fix the leak, which you can do by tightening loose connections and re-welding broken welds.
Repairing an old car’s exhaust
In addition to causing a smelly mess on your car, an old exhaust can also affect the fuel efficiency of your car. If your exhaust is backed up, it can damage critical parts of your engine and fuel system. There are a number of reasons why your car may be losing fuel efficiency, so you’ll want to have an experienced automotive technician look at it. Listed below are some of the most common problems that you’ll need to fix before submitting your vehicle for inspection.
To get started, remove the catalytic converter and the middle part of the exhaust system. This part is usually attached to the outer lip by two or three bolts. Then, unscrew the nut and bolt that connects the converter to the muffler. Make sure to tighten the bolts against the rubber hangers. After you’ve removed the old muffler, carefully remove the old rubber hangers. Replace them with new ones.
Pre-fitting a custom pipe
If you are having trouble determining whether or not your car is too noisy, you should consider pre-fitting a custom pipe. Aftermarket pipes generally have curves in them that help direct gases into the exhaust pipe. There are many types of custom pipes, including y pipes and h pipes. Using a mechanic’s mirror to check for dents and creases will help you determine whether your custom pipe is too noisy.
Adding a baffle
A baffle is a muffler that has multiple compartments and perforations to divert sound waves. This reduces the amount of air and fuel entering and leaving the combustion chamber, resulting in a quiet exhaust system. There are many types of baffles, including mufflers with multiple compartments and perforations. Computational Fluid Dynamics (CFD) analysis shows an example of baffling. Without a baffle, the exhaust waves leave the combustion chamber unburned, which means a lower gas mileage.
Aftermarket exhausts may affect motorcycle inspections, but some are less noisy than factory systems. You can check the specifications for your state’s inspections by calling the local authorities and asking about the requirements. While Harley exhausts are much louder than factory-installed units, they may still be legal in your state. The performance gain depends on whether or not you have to quieten the bike during inspection.
Using epoxy to seal a hole in the exhaust pipe
The first step is to prepare the area where the leak will be. If it’s a small hole, you can use a wire dyke to cut a patch. Then, use the epoxy to cover the hole, leaving about an eighth-inch of space around the hole. Once this layer is dry, apply a second one. The second one should be as smooth and even as the first, with no gaps or runs.
If you have a larger hole, you can use Dynomax muffler cement, which is specially formulated to plug larger holes. Make sure to clean the hole of any rust before applying the putty. If the hole is too large, you may need to replace the exhaust pipe. However, it’s not impossible to repair a small hole using epoxy. If you’re unsure, you can consult a professional.
Adding a resonator
If you want to add a resonator to quiet your exhaust for inspection, you must first understand what it does. It works by modulating the exhaust sound so that the muffler can function properly. This component acts like an echo chamber, and allows the car to produce more power while maintaining a quiet exhaust. It can be used in conjunction with mufflers to improve both performance and safety.
Resonators are an important part of factory exhaust systems. While they help reduce noise, some can even make the exhaust sound aggressive. The Ford Mustang is one example of a car that uses a resonator and muffler combination. The V8 Mustang’s resonator has no muffler, and this combination of components is highly effective at minimizing the noise and improving the car’s performance. However, it can also cause problems, such as an engine stalling or even not starting.
