Disadvantages of sunroof in cars

When you buy a new car with a sunroof, you may usually try it out once or twice, but after that week later you forget that it's even there. The main disadvantage of sunroofs is that use, particularly in cities with hot climates is minimal and thus, it gets deteriorate with time with no use. In addition, the replacement or repair costs are expensive. You can also check other disadvantages of sunroofs in cars when you consider buying a car with a sunroof. 

Disadvantages of sunroof in cars

1. Sunroofs affect the mileage of the car. Driving at high speeds with an open sunroof affects the aerodynamics of the car which causes additional drag. 
2. The sunroof eats the headroom. 
3. When the car gets old, the sunroof often starts leaking. 
4. As we talk in the first paragraph, keeping the sunroof in working condition required a lot of regular maintenance. 
5. After years, the sunroof electrical motor starts creating electrical problems. 

What are the disadvantages of muff coupling?

Muff coupling is also called sleeve coupling is the simplest type of rigid coupling that consists of a hollow cylinder. Whose inner diameter is the same as a shaft. It is fitted over the ends of two shafts by means of gif head key and power transmitted from one shaft to another by means of a key and a sleeve. Now, let us have a deep insight into the disadvantages of muff coupling in this article. 

Disadvantages of muff coupling:

• Muff coupling is difficult to assemble or dismantle.
• It is a rigid type of coupling and requires accurate alignment of shafts.
• It can not absorb shocks and vibrations because there are no flexible parts.
• This coupling is used where the motion is free from vibrations.
• It requires more axial space compared with flange coupling.

Disadvantages of gear drive

Gear drive is used to transmitting mechanical power from one place to another, often used to convey power to wheels of the bicycle and motorcycles. It is also used in a wide variety of machine apart from the vehicle. Let us have a deep insight into the disadvantages of gear drive in this article. 

Disadvantages of gear drive :

• It is very difficult to manufacture the gears because in manufacturing gears the specials equipment are needed which is costly so they are not economical.
• They are not suitable for very large centre distances of shafts.
• They always require proper lubrication.
• If there may any error during manufacturing then it may cause a big accident.
• If a large number of gear wheels used in gear trains that increases the weight of the machine.
• Noise and vibrations will be more at high speeds. 
• Use of a large number of gear wheels in gear trains increases the weight of the machine.

Disadvantages of chain drive

A chain drive is positive drives, so the velocity ratio remains constant and no-slip occurs, making it suitable mainly for the shorter centre distance. The chain drive is a way of mechanical power transmission mainly used in a motorcycle. Let us check some disadvantages of a chain drive in this article. 

Disadvantages of a chain drive : 

• It is heavier as compared to belt drive.
• In chain drive, both driving and driven shafts are perfectly inclined.
• It requires accurate mounting and good lubrication.
• Higher initial cost because production cost for the chain is high.
• Weight of a chain is high and if the chain is dry it becomes noisy.
• Lubrication of its parts is required.
• There are gradual stretching and an increase in the length of chains. Some of its links need to be removed from time to time.

Disadvantages of liquid cooling system

The liquid cooling system takes away the excessive heat generated in the engine and saves it from overheating. It also keeps the engine at working temperature for efficient and economical working. Let us have a deep insight into the disadvantages provided by using this liquid cooling system. 

Disadvantages of a liquid cooling system :

• This is a dependent system in which water circulation in the jackets is to be ensured by additional means.
• Power absorbed by the pump is considered for water circulation and this affects the engine's power output.
• Cost of this system is considerably high.
• System requires considerable maintenance of its various parts.
• In the event of cooling system failure, serious damage to the engine may occur.

Disadvantages of air cooling system

Air cooling system is carried out to the outer parts of the engine is radiated and driven away by the air stream obtained from the atmosphere. For efficient cooling fins are provided around the cylinder and cylinder head to increases the contact area. Air colling system mainly depends upon the following factors. 

• The total area of fin surface
• The velocity and amount of the cooling air
• The temperature of fins and of the cooling air 

Let us have a deep insight into the disadvantages provided by the air cooling system. 

Disadvantages of air cooling system : 

• It can be applied only to small and medium engines.
• Cooling is not uniform.
• In places where ambient temperatures are lower.
• Higher working temperatures compared to water-cooling.

Disadvantages of electronic fuel injection

Replacing carburettors with electronic fuel injection (EFI) for delivery of fuel on engines has numerous advantages. However, for each engine installation, achieving these benefits requires a comprehensive integration and calibration. The spark-ignition engine with an electronic fuel injection system compared with a carburettor unit have the following unfavourable points too. 

Disadvantages of electronic fuel injection : 

• High maintenance cost.
• Possibility of malfunction of some sensors.
• Difficulty in servicing.
• Complex design.
• Chances of developing leakage at the valve seat. 
• Injection pressure needed 200 to 300 bar. 

Disadvantages of alcohol as a fuel

Alcohol can be obtained from nature and it can manufacture very easily so alcohol as a fuel is very attractive. It is one of the liquid fuel alternatives of gasoline used in a combustion engine. There are different types of alcohol but some main types are methanol, ethanol, propanol, and butanol. Let us have a deep insight into the disadvantages of alcohol used as a fuel. 

Disadvantages of alcohol as a fuel :

• It contains oxygen and therefore requires less air for stoichiometric combustion.
• It has a low energy content because the calorific value of the fuel is almost half.
• Combustion of alcohols produces more aldehydes in the exhaust and this would be a serious exhaust pollution problem.
• It is much more corrosive than gasoline on copper, brass, aluminium, rubber and many plastics. 
• With long term use of alcohol fuel lines and tanks, gaskets and even metal engine parts can deteriorate very early especially methanol is very corrosive on metals.
• It has poor cold-weather starting characteristics due to low vapour pressure and evaporation. 
• Alcohols have poor ignition characteristics too.
• Alcohols have invisible flames that are hazardous when handling fuel.
• The danger of storage tank flammability air can leak into storage tanks and create a combustible mixture.
• Because of low flame temperatures, there will be fewer NOx emissions.
• Alcohol has a strong odour and it is very offensive.
• In fuel delivery systems, there is a possibility of vapour lock.

Disadvantages of using hydrogen as a fuel

Hydrogen is another alternate fuel tried for IC engines. Investigations were carried out extensively in many countries. The most attractive features of hydrogen as an IC engine fuel are that it can be produced from a potentially available raw material, water and the main product of its combustion again is water.

Disadvantages of using hydrogen as a fuel :

• The requirement of heavy, bulky fuel storage both in the vehicle and at the service stations.
• Hydrogen can be stored either as a cryogenic liquid or as a compressed gas. If stored as a liquid, it would have to be kept under pressure at a very low temperature requiring a thermally super-insulated fuel tank.
• Storing in a gas phase would require a high-pressure vessel with limited capacity.
• Hydrogen is difficult to refuel.
• Possibility of detonation.
• Poor engine volumetric efficiency. 
• Fuel cost would be high at present-day technology because costly to produce.
• Also the problem of availability of hydrogen.
• Hydrogen fuel ignites very easily and therefore the design of fuel intake was done with at most care.
• It may not be toxic but it is flammable for sure. This would add unnecessarily and new risk into society.
• While hydrogen is an alternative fuel, a disadvantage is that it still has a dependency on coal, oil, and natural gas.

The automobile company Mazda has adapted a rotary Wankel engine to run on hydrogen fuel. this car uses a metal hybrid fuel storage system.

Disadvantages of hard water

Disadvantages of hard water in Domestic use :

• Washing :

When we use hard water as a washing purpose the using water does not lather freely with soap and it produces sticky precipitates of calcium and magnesium soaps. This cause wastage of a lot of shops is used. 

• Bathing : Bathing

Hard water does not lather freely with shop solution and produces sticky scum on the body.
Thus, cleansing quality of soap is depressed and lots of water is wasted too.

• Cooking :

Due to the presence of dissolved hardness, the boiling point of water is elevated and it producing slats. Therefore, more fuel and time are required for cooking.

• Drinking :

Hard water causes a bad effect on our digestive system and also the possibility of forming calcium oxalate crystals in urinary tracks is increased.

Disadvantages of hard water in Industrial use : 

• Textile industry :

Hard water cannot produce good quality of lathe. It precipitates of calcium and magnesium soaps adhere to the fabrics. These fabrics when dyed do not produce exact shades of colour.

• Sugar industry :

If hard water used in sugar refining it causes difficulties in the crystallization of sugar and the produced sugar may be deliquescent.

• Dyeing industry :

Because of the use of hard water which yields impure shades and gives spots on the fabrics being dyed.

• Laundry :

Hard water is used in laundry causes much of the soap used in washing and may even cause colouration of clothes.

• Concrete making :

It affects the hydration of cement and the final strength of the hardened concrete.

• Pharmaceutical industry : 

If hard water used for preparing pharmaceutical products like drugs or injection may produce certain undesirable products in them.

Disadvantages of hard water in steam generation in boilers :

If hard water directly fed into the boilers it may cause many troubles following below :

• Scale and sludge formation 
• Corrosion 
• Priming and foaming 
• Caustic embrittlement 

Disadvantages of threaded joints

Threaded joints are widely used in mechanical assemblies its been like 60% of the parts have made by threads. Some advantages are due to the popularity of threaded joints.

Let us have a deep insight into the disadvantages provided by a threaded joint below. 

Disadvantages of threaded joint : 

• Threaded joints require holes in machine parts for clamping because of that stress concentration near the threaded portion of the parts it causes fatigue failure too in some case.
• Threaded joints loosen when subjected to vibrations.

Disadvantages of glass reinforced plastic

Reinforced plastic has more strength and high resistance against weather, thus finding its use in outdoor applications and other many applications so it allows many advantages. Let us have a deep insight into the disadvantages of glass-reinforced plastic.

Disadvantages of glass-reinforced plastic :

• Glass-reinforced plastic has poor rigidity and stiffness.
• Glass-reinforced plastic is limited up to a temperature of 300 ⁰C.
• Glass fibre being considered as cancer-causing, it is labelled a health concern.
• Glass fibre also irritates a person's skin as well as eyes and lungs. 

Disadvantages of manual process planning

Manual process planning (MPP) has many disadvantages. In this article, you can check it out some information on the disadvantages of manual process planning to know more about it.

Disadvantages of manual process planning :

• MPP is largely subjective.
• Incorporation of process changes is extremely difficult.
• The quality of the process plan is directly related to the experience and skill of the planner.
• It is difficult to check if the process plan is consistent and optimized.
• It is tiresome to search manually the process plans of similar parts form a large amount of documentation of the company.
• Technological changes of batch sized require the change in process plan.
• MPPs are slow to respond.

Disadvantages of all wheel drive

An all-wheel-drive vehicle is one with a powertrain that can supply power to all its wheels, whether full-time or on-demand. Let us have a deep insight into the disadvantages provided by car used to all-wheel drive.

Disadvantages of all-wheel drive :

• More expensive to buy.
• Uses more fuel.
• Higher maintenance and repair costs.
• Tires need to be the exact same size may need 4 new ones if one destroyed.
• Better traction in slippery road conditions can make a driver over-confident in their ability to stop or turn, often resulting in an accident.
• Heavy more parts mean more weight.
• Unusual handling characteristics.

Disadvantages of turbochargers

A turbocharger is the mechanical device that increases the flow of air in the engine, runs on waste exhaust gasses or we can say that it derives its energy from exhaust gasses that usually get wasted in the naturally aspirated engine. Let us have a deep insight into the disadvantages provided by the turbocharger. 

Disadvantages of turbochargers :

• The turbochargers of the cars which are equipped with the turbocharged technology have a short service life then the frequency of replacing turbocharger equals an additional charge of maintenance.
• Installation is a key component of a turbocharger's effectiveness, and not all mechanics are able to properly install one. If the mechanic even makes a minor mistake, it not only makes the turbocharger ineffective, it can also cause damage inside the engine.
• Turbochargers also can cause wear and tear on an engine and may also require an engine to be replaced sooner than expected.
• Because turbocharged vehicles are travelling at high speeds, any malfunctions may result in dangerous situations. While a turbocharger may be beneficial to those living in the mountains and having to climb steep hills, high-speed travel may cause a driver to turn off the road or crash into another vehicle.

Disadvantages of diesel engine

A petrol engine is an internal combustion engine made for converting heat into mechanical energy which is generated by spark ignition of petrol. Generally, petrol and air are usually mixed after compression stroke. There are four strokes in two revolutions of the piston such as suction, compression, expansion and exhaust. Let us have a deep insight into the disadvantages provided by the petrol engine. 

Disadvantages of diesel engine :

• Operating noise.
• Diesel engine employs a higher compression ratio so they must build stronger than the standard petrol engine it makes them heavier and bit more expensive to build.
• Poor cold-weather starting.
• The diesel-powered engine is costlier than the petrol one.
• Not sending the heat out the tailpipe.
• Repairing charge ( fuel injection breakdown ) is high than the petrol engine.
• Not high-speed performance as petrol cars.
• Increased demand for diesel creating high competition.
• The diesel engine is slower than Petrol ones.
• Need to change the oil, air, fuel filters.
• Need regular maintenance.
• No flashy high-speed performance as petrol cars.
• Some vehicles require manual emptying of water separators.

Disadvantages of petrol engine

A petrol engine is an internal combustion engine made for converting heat into mechanical energy which is generated by spark ignition of petrol. Generally, petrol and air are usually mixed after compression stroke. There are four strokes in two revolutions of the piston such as suction, compression, expansion and exhaust. Let us have a deep insight into the disadvantages provided by the petrol engine. 

Disadvantages of petrol engine :

• Torque is less and pulling power is less as compare to a diesel engine.
• Less mileage.
• Consume a high amount of fuel while running on low RPM.
• Overtaking might seem trouble without gear changing as torque output is less.
• Overall fuel efficiency is less as compared to a diesel engine.
• The service requirement is frequent.
• Less durability and strength (up to 150000 miles).