Aerospace Cycling

All answers for Motorcycle



Question: Why Do Air-Cooled Motorcycle Engines Have Fins

Air-cooled engines remove engine heat by using the air that hits the engine when the bike is moving. This is why they have fins on the outside to create more surface area for the air to pass over. This coolant is circulated through passages built into the engine.

Why are fins needed on an air cooled engine?

A cylinder from an air-cooled aviation engine, a Continental C85. Notice the rows of fins on both the steel cylinder barrel and the aluminum cylinder head. The fins provide additional surface area for air to pass over the cylinder and absorb heat.

What is the purpose of cooling fins?

Cooling fins rely on conduction to diffuse the heat away from what is being cooled. The fins are designed to increase the surface area with another liquid (air for example). Here the heat is transfered using convection, cooling the fins and warming the liquid.

Why do some of the cooling fins on the cylinder of an air cooled engine have a larger surface area?

An air-cooled engine has a simple design. It has metal fins on the outer surface of head and cylinder block which increase the area exposed to the cooling air. These fins provide a larger contact area so as to achieve better heat dissipation.

Why fins are not used in water cooled engine?

These fins draw heat away from the cylinder and radiate away the heat. Instead of fins used to keep the engine cool, in water-cooled engines the engine block and heads are cast solid but with internals passages throughout the engine block around the cylinders and over the cylinder in the cylinder head.

What are the disadvantages of an air cooled engine?

What are the disadvantages of an air-cooled engine? Air-cooled engines are more likely to overheat. They can also be more expensive to build and the large fans used to cool the engine can take away a lot of power.

Do air-cooled motorcycles overheat?

An air-cooled motorcycle will not overheat in slow-moving traffic, provided that the air-fuel mixture and idle speed are correct, the valve clearances are within specification, and the oil is changed regularly.

Why are cooling fins thin and flat?

In many cases, the use of an increased number of tall, thin, flat fins will give better performance and less pressure drop than any modification of the fin shape. Based on airflow resistance, the flat fins maintain the lowest pressure drop and hence the greatest mass flow of air.

What is cooling fins made of?

In most high performance applications, fins are made of copper or aluminum. Aluminum fins are preferred in aircraft electronic liquid cooling applications due to their lighter weight.

How does a motorcycle cooling system work?

A pump (known as the water pump) circulates and pushes a water/antifreeze solution from the water jackets inside the engine to the radiator then back into the engine. This coolant is passed through small plates during radiator circulation which essentially cools it down due to the wind passing through it.

What is the purpose of water pump in cooling system?

The role of the water pump in an engine is primarily to regulate its temperature and to prevent the engine from overheating. It pumps water and coolant through the engine block and cylinder head (the main body of the engine) via a series of pipes, drawing out the heat generated, before going into a radiator.

Which of the following is absent in the air cooled engine?

Which of the following is absent in the air-Cooled Engine? Explanation: The radiator is absent in these types because of which the air-cooled method is light in weight and applicable for two-wheelers as well.

Which is better air-cooled or water-cooled engine?

A liquid cooled engine produces more power/torque than an air-cooled one. A liquid cooled engine, since cooled by liquids, maintains a better control temperature. Air-cooled engines are fuel efficient, affordable and require lesser engine space than that of liquid cooled engines.

What are the advantages of air-cooled engines?

Advantages of air cooled engines 1. Its design of air-cooled engine is simple. 2. It is lighter in weight than water-cooled engines due to the absence of water jackets, radiator, circulating pump and the weight of the cooling water.

Which is better air-cooled or liquid cooled?

Air coolers are quite good at relocating heat away from the CPU, but keep in mind that heat is then dispersed into the case. This can raise the ambient temperature of the system overall. Liquid coolers do a better job of relocating that heat outside of the system via the fans on the radiator.

How long do air-cooled engines last?

Airplane engines regularly last 40+ years (and thousands of hours running at nearly full throttle) and most of them are air cooled. Maintenance is key.

Are air-cooled engines reliable?

That “reliability” attitude will KILL an air-cooled VW. BUT- they are ONLY reliable if they are maintained! If you take care of the regular maintenance items every 1,500-2000 miles (oil change, valve adjustment, points, etc), then they’ll go forever.

How hot is too hot for a motorcycle engine?

However, under normal conditions, the above mentioned temperature range of 150F to 230F should stand and anything above this range should be a cause for concern. If the engine temperature is more than 230F, then the engine is clearly overheated.

How hot is too hot for an air cooled engine?

Air cooled engines ARE ALLOWED to run hotter BY DESIGN because higher efficiency is reached in the 240-280 F. range. Without having to worry about coolant boil and runaway cavitation with liquid coolant, you can allow an engine to have a higher “normal operating temperature”.

How do you know if your air cooled motorcycle is overheating?

Registered. One symptom is detonation when the throttle is advanced too quickly. Because the head and sparkplug are much hotter than normal, the engine will plink when you try to force it a little.. Also, oil pressure will be low enough to flick on the warning light at idle, even though the level is still fine.

What are the different types of fins?

For each fish, generally, there are five main fins follows: Dorsal, Pelvic, Caudal (tail), Anal and Pectoral as shown in Fig. 1. Dorsal fins are located either on the back of the fish or its top, it helps the fish during sharp turning or stops.

Why thin fins are preferred over a thick fin?

Why thin fins are preferred over thick fins? if the fin has the thickest point forward it improves its ability to handle higher angles of attack, at the cost of some drag, but it can be made thinner because of this angle of attack capability.