The exhaust system in your vehicle is there to get rid of the exhaust gases so they don’t stay inside the vehicle. The air-fuel mixtures go through the catalytic converter, then the exhaust gases are collected from the cylinder head to the exhaust manifold. The manifold then funnels and diverts the exhaust gas from the cylinders then releases them through a pipe into the muffler.
The muffler is there to reduce the amount of noise that happens in the exhaust system – this is done by allowing the gas to expand slowly. If the muffler wasn’t there, the gases would expand quickly, and this would cause the noise in the system to be louder. As a driver, you may be wondering what temperature the exhaust system is under.
Exhaust System Temperature
Since the exhaust system deals with the gases that have come out of the combustion chamber, they do reach extremely hot temperatures. The exhaust pipe temperature is between 300F to 500F, but they can handle higher temperatures up to 1200 degrees. The hotter the exhaust pipe system, the higher the chance of the cat converter damager. Because of cooler parts in the vehicle, the exhaust system gets a chance to cool down.
Catalytic Converter – the catalytic converter converts removes the toxic carbon monoxide from the gases and turns it into carbon dioxide so it can leave the exhaust pipe safely. The catalytic converter temperature can go up to 350F. Sometimes the combustion chamber can be given a rich air-fuel mixture meaning that some unburnt gases pass through the system – the system and the cat converter can each even higher temperatures.
Mufflers – the mufflers temperature is between 300F and 500F – it’ll hit this peak temperature when you’re driving rather than when the vehicles idling. As the temperature of the muffler gets higher, the engines RPM will also be higher. If gas isn’t being combusted properly in the combustion chamber, this can cause the muffler to get hotter.
What Causes the Exhaust System to Get Hot?
There are a few factors that’ll determine how hot the exhaust system gets. You can use this to gauge how hot your exhaust system is at that moment in time, so you won’t have to keep guessing what the temperature is. The more of these things you’re doing, the higher the exhaust system would get.
Engine Speed – if the vehicle’s engine is a high-performance engine and runs on a lot of horsepower, then the exhaust pipe will get hotter. If you’re driving at a high RPM, for example, 2,000 RPM, then the exhaust pipe can reach up to 600F which means it’ll get really hot. If you’re idling and you’re driving with a low RPM let’s say 700 RPM, then the exhaust gases can reach temperatures of 350F which isn’t very hot – this is actually a cool temperature for the exhaust pipe.
Engine Condition – not only does the power of the engine determine how hot the exhaust system gets, but the condition the engines in does have a big influence on how hot the system will get. If the vehicle is old, and the engine hasn’t been serviced and maintained much, it’s much more likely to overheat. If the engine overheats, then the exhaust system can get hotter as the gas passes through them.
Tailpipe length – the length of the tailpipe does determine how hot the gases will be in the exhaust system. The tailpipe comes from the engine so the longer the distance the exhaust gases have to move from the engine, the more heat they’ll lose as they reach the exhaust system which is the end of the exhaust pipe. So, vehicles with a longer tailpipe have cooler exhaust pipes than vehicles with a shorter one.
Exhaust system condition – the condition the exhaust system is in will determine how hot the temperature will be in the pipe. If the exhaust system has been bent due to poor maintenance or ruse has built up in there, then the temperatures within there can reach abnormally high temperatures. This is why you need to maintain your vehicle often so that you don’t have a system that isn’t in good condition. Hot exhaust systems can damage the exhaust system further and it makes it harder for the gases to escape.
How to Prevent Damage to the Exhaust System
There are a few things you can do to limit the amount of damage given to the exhaust system. Damage can come from poor servicing and maintenance, over usage, and extremely hot temperatures. There are components around the exhaust system that get really hot as well and if they get too hot, they can damage. You need to try and limit the hot temperatures so that the components around don’t get damaged.
Insulate Exhaust Pipe – you need to insulate the exhaust pipe (View on Amazon) if you want the components around it to not get hot – this is the most effective method for preventing the heat transfer. The insulation ensures that the hot temperature is trapped inside the exhaust pipe which means no other damage is occurring outside the exhaust pipe – a hot temperature inside the exhaust pipe isn’t a bad thing.
There are a few ways you can insulate the exhaust system. For example, you can insulate the exhaust system by using materials like ceramic, fiberglass, and silica – all of these materials get reach very high temperatures without being affected. It’s important that you use a heat resistant material if you’re going to use one of them to insulate the exhaust pipe. Fiberglass can start to melt at 815F which is hotter than the exhaust can get.
Add barrier Between Exhaust Pipe and Engine Bay – To protect the engine bay, you can add a barrier between the exhaust pipe and the engine bay to prevent heat from escaping the exhaust pipe. You can also use a reflective barrier in order to reflect the heat away from the engine bay. If your vehicle is newer, chances are your manufacturer used an aluminum heat shield that’s placed away from the exhaust manifold and there’s a tiny air gap that’ll carry the heat away from the sensitive components like the engine bay.
If you have an old vehicle and there’s no embossed steel or aluminum heat shields (View on Amazon), then you can either add your own if you have experience with the vehicle. Or, you can head down to the mechanic and get it done there.
Insulate Other Components – rather than only insulating the exhaust, you can insulate the heat-sensitive components around them. In some cases, it’s easier to insulate the surrounding components that it is to insulate the exhaust itself. You’ll need to find heat resistant materials like hoses, cables, and heat sleeves to cover the other components. You can use a heat sleeve that’s made out of fiberglass – this would provide good insulation for protecting the sleeve.
Exhaust System Maintenance
One of the reasons why your exhaust system will reach such hot temperatures and start to malfunction is rust. The exhaust system can come into contact with water and when this is combined with hot gases, it can cause corrosion in the system. This problem mainly occurs in the muffler where the gases don’t reach a high enough temperature to vaporize the water that has been collected in there.
To avoid a worn-down exhaust system, you need to make sure that you’re servicing the exhaust system often. If not, then you’ll find yourself going to the mechanic often to replace and repair new parts. If you’re looking after the exhaust system or other key components in the vehicle, then you won’t have to see deal with worn out and failing parts.
If you want to avoid exhaust system problems and save $100s of dollars that you’ll spend at the auto repair shop, you’ll need to service your vehicle often – you can use our mechanic-rated Auto Maintenance and Repair Manual to do this. It’s basically what mechanics use to go through your vehicle to check if there are any problems that need fixing. As soon as they notice the most minor problem, they’ll ask you to fork out some money even though it’s a problem you can fix yourself in minutes – the manual will teach you how to maintain your vehicle every few thousand miles and it’ll teach you how to fix minor problems that mechanics will ask you to pay for; saving you money in the long run.
A lot of our readers have the Auto Maintenance and Repair Manual printed on their garage wall and 92% of them haven’t visited the auto repair shop in the last year because they know what to do to avoid problems. All it takes is giving your vehicle a little attention every few thousand miles and you’ll never spend money at the workshop again.
Systems of Bad Exhaust System
There are a few symptoms that you’ll experience if the exhaust system is bad. These systems can be very obvious and it makes it quite clear that you have an exhaust system that doesn’t work correctly to remove the toxic gas from the engine through the exhaust.
Bad Fuel Efficiency – if there’s a problem with your exhaust system, the first thing that you’ll notice is the vehicle consumes more fuel. If you’ve noticed the fuel efficiency has been low recently, then this can be a sign that the exhaust is bad.
Loud Exhaust – if the noise coming out the exhaust is loud and it sounds weird, you might have a faulty exhaust. As you drive, this sound becomes worse. It could signify that the muffler has started to crack because the exhaust system wasn’t maintained properly. If you don’t get the muffler replaced or checked out, the problem could be transferred to the catalytic converter and you may find yourself dealing with more problems.
Fumes Leaking into Car – the exhaust system is meant to exhaust gases out of the tailpipes but if you notice that the fumes are going into the vehicle, this the fumes could be leaking. This could cause problems with the vehicle’s health because the gases have carbon dioxide.
Condensed Exhaust Pipe – if the gas leaves the cat converter and the carbon monoxide is removed leaving carbon dioxide and water, then the water can condense into the muffler which can cause rust. If you notice any of this, you need to head down to the mechanic to get it checked out.