【Compare】Milwaukee Eight vs Twin Cam

About two years have passed since Milwaukee Eight was released, but it can be said that twin cams are still superior even now.

In comparison with Milwaukee Eight I would like to introduce the good points of twin cams and how to bring out the performance and taste of twin cams.

Recently there are many topics of Milwaukee Eight, twin cam information dissemination is decreasing.

Milwaukee Eight magazines, etc. are written that the power goes up with high cam, there is atmosphere like twin cam era has ended already.

But that’s not the case.

It is difficult to exceed the intake efficiency and filling efficiency of twin cams unless the side draft of the port layout is changed, as the intake efficiency is better for the two valve twin cams and the four valve Milwaukee eight.

The twin cam engine adopts a side draft and is therefore the best

In addition to the merits of twin cams, images and illustrations, I would like to explain how to improve the performance of twin cams.

Comparison between Milwaukee Eight and Twin Cam Engine

TC can choose carburetor or injection with over 2,000 cc engine

One of the attractions of the twin cam engine is the carburetor and injection, both of which can customize over 2,000 cc.

A high performance of over 2,000 cc can be acquired in the taste of the carburetor, with twin cams, and from the performance makers such as S&S and JIMS, the complete engine of the carburetor is on sale.

Since there is no carburetor in Milwaukee Eight, it is impossible to customize for a large displacement engine with a carburettor.

Twin cam 2 valve is more efficient for long stroke engine

The ideal number of side draft valves with long stroke engines is the two valves adopted by twin cams to take in the mixture from the side.

The air-fuel mixture that entered from the side fills the cylinder so as to turn around the combustion chamber from one intake valve, so that more air-fuel mixture can be sucked toward the center of the piston smoothly .

Because Milwaukee Eight is a 4 valve, air-fuel mixture inspired from the side scrambles with two intake valves to generate turbulence, making it difficult for air-fuel mixture to enter the cylinder smoothly.

If you want to be sucked in smoothly with a 4-valve engine, it is not a side draft but a downdraft of V-ROD.

However, I think that it was difficult for Milwaukee Eight to adopt it due to the design of the tank.

Let’s introduce the powerful torque and horsepower of a twin cam that exceeds the filling efficiency of Milwaukee Eight.

A powerful torque of the twin cam and a way to raise the power all the way

Flywheel that produces powerful torque

The charm of Harley Davidson is its powerful torque.

This powerful torque is born by the rotation of a heavy flywheel.

When the flywheel is heavier, the moment of inertia is stronger, and as the flywheel with its strong energy goes around, it does not stop easily, and it can continue to rotate steadily even if the idling is lowered.

Since it can continue to rotate steadily, you can continue climbing windering even at low rotation speed.

On the contrary, if the flywheel is light, you can get a quick response to the accelerator response.

However, horsepower is easier to raise, but the torque is reduced due to weak energy that continues to rotate.

Harley Davidson aims for high revolution and high power according to the times, it is said that the feeling of beating is weak because the weight reduction of the flywheel is after EVO

In order to obtain a feeling of hitting a strong torque, it is necessary to increase the physical weight of the flywheel.

The work is to weld a heavy weight link to the flywheel and adjust the crankshaft.

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Increase power in the whole area with high efficiency of cylinder head

As mentioned earlier, the number of valves of the side draft long stroke engine is the two most valuable filling efficiency, and this cylinder head determines the filling efficiency.

Normal cylinder head

• Combustion chamber with poor combustion efficiency
• Valve seat with low intake efficiency
• Port through which air-fuel mixture is difficult to pass smoothly

Even if the air-fuel mixture is burned in this state, strong combustion pressure can not be generated, and at low rotation, the compression resistance is lost, and powerful torque is not generated.

If torque is not generated, horsepower due to rotation speed will not occur.

The points of improvement of this cylinder head are as follows.

With the above three points, the air-fuel mixture can quickly be taken into the combustion chamber, enabling high-efficiency combustion in a short time.

All the power born from the engine starts from the combustion chamber of this cylinder head.

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In the side draft, the filling efficiency of the two valve twin cam is higher than the four valves, but it is the combustion chamber of the cylinder head that further increases the filling efficiency.

Since this area is a packed part of engineers’ expertise, the shape varies among engineers.

The volume of the combustion chamber changes according to the octane number of gasoline, so it is a very important part.

If the power goes up, you can turn heavy flywheel powerfully, and you can enjoy a tremendous acceleration of V type 2 cylinder large displacement engine in tasty engine more like Harley Davidson.

If you raise efficiency ultimately at TC 103, you will demonstrate torque 16kg-m to 120 horsepower

The highest peak of the 2-valve engine Super XR-TC can increase the efficiency by independent inhalation of the side draft, maximize the charging efficiency with swirl to the maximum, and generate torque of 16 kg-m at 120 horsepower with TC 103 (1,689 cc) .

The independent inspiration of this side draft can achieve high filling efficiency because it is 2 valves.

If you increase the performance of a long stroke engine, you can say that twin cams are the best.

Summary

Harley Davidson ‘s life expectancy is generally said to be 60 years.

It is a very interesting engine that you can add insufficient things to the engine of each age if you feel that the taste and performance you want is different.

I am summarizing the points.

• The Milwaukee Eight 4 valve engine is extremely difficult to exceed the two valve twin cam filling efficiency unless you change the side draft port layout
• The twin cam engine can select a carburettor and injection even if it exceeds 2,000 cc custom
• Harley Davidson ‘s sense of beating is born from a flywheel
• The heart of the engine is a cylinder head, efficiency is improved with high efficiency in all areas

While cars are changing from hybrid to the next generation, Harley – Davidson Company released Milwaukee ‘s air – cooled engine under strict exhaust emission regulations.

Milwaukee Eight’s four-valve engine can not overcome the efficiency of twin cams, but it should become an interesting engine year after year, just as with engines of other age.

 

Today, thank you for reading until the end.

 

ARIGATO BIKE

 

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