The Power

I want to do a comparison between two types of engine. The 2 Big Valve engine compared to a 4 valve engine. I decided to write about this topic because I can see a lot of scooter owner now really power up their engine and among them, there are lots of 4 valve engine users. Why do they pick this type of engine and what is their difference with the other type of engine. Also lot of scooter owners that power up their scooter choose the big valve to replace the stock one. What are the advantages and disadvantages of this engine. Through this post I hope that you could learn more about this type of engine and may help you to choose your desired engine type.

Let start with the Big Valve engines. This engine type is almost similar with the stock one but the difference is that the valves and ports are bigger. This big valve and ports helps to provide more power by mixing fuel and air in much large amount than the stock valve. In return this engine also higher fuel consumption compared to the stock. Adding fuel consumption for the exchange of power is really good for those who travel in long distance. From this modification you can really achieve a great hp and mileage in the high ways. Larger valves increases the breathing capacity of your engine but really need a good modification. Always remember that if you would try to modify to big valve there are still other things to consider. First is the supply of the fuel and air to the engine, with a bigger valve and port the engine will need to gain the right amount of mixture. The common problem with this is the one that supply the fuel and air. Yes, the carburetor itself. When you modify your engine to a big valve, commonly your mechanic will tell you that you need a much larger supply of fuel and in that case you will need to buy a new carburetor that can supply the fuel needed. From 26mm carburetor you will change to a bigger carburetor, maybe 28mm or 30mm will do.

In case that you don't have the budget to afford a new one other modification will do, adjusting your old carburetor to supply more fuel. This can be done by enlarging the jets of the carburetor. The other one is your exhaust system. Is your exhaust system can hold the power that your engine gives? Stock pipes are not good with this type of engine because it will not allow the engine to breath enough. Change your pipe to a power pipe with much bigger elbows and exhaust tip. You can look for some power pipe on market and they come available depending on the power of your engine. Best engine type for all riders that loves to travel a lot at long distance.

In terms of using the 4 valve engine will really cost a lot. This type of engine really comes with a high price but absolutely give you the power you expect. Best engine type for those who loves great power response. The 4 valve engine has 2 intake valves and 2 exhaust valve making improvement for the the fuel and air mixture. Also 4 valve engine has much larger surface are that creates or gives more combustion potential. 4 valve engine is much powerful than the big valve but also needs a lot of supply of fuel. The 4 valve is not that expensive but the one expensive is the parts to be added to the engine. Tappets, cam breather, springs, rollers and other. Mechanic also recommend to use a radiator for the 4 valve to help for the cooling system of the engine. Really reliable for heavy long travels ride and will sure you that it will never give up till dawn. This type of engine is great in style, cost more than any type but still give the best power performance for your scooter. A good maintenance can keep your 4 valve to last for a long period of time. 

About on what you have read above, I hope it helps you to choose what is right for your taste. It will be your choice on what engine type you would choose. A Big Valve engine with the slight fuel consumption and better power performance or the 4 Valve engine for high fuel consumption and best power performance. Take a time to think for the best choice. The budget also will be one thing to be consider if you plan for an upgrade engine. There are lot of brands to be chosen. They varies in price but be sure to choose those with high quality and great durability. For me they are just the same, maybe the type of use will define the performance you will need for your scooter.

2-Stroke VS 4-Stroke Engine

Maybe from past days or years you have own a 2-stroke engine motorcycle or if not you have seen someone owning one. Even scooters are available in 2-stroke and 4-stroke engines. The question will be, how the 4-stroke is better than 2-stroke? Why does manufacturers now stop launching or releasing any 2-stroke engine motorcycle anymore? This question will be answered in this thread and hope to help you to find for the information you are looking for.

First of all lets define what is the meaning of the word "stroke". Stroke is the movement of the piston in the cylinder back and forth. The length of the stroke will be determined by the crankshaft or the distance travel of the piston in the engine cylinder. The 2-stroke engine has two strokes to complete a power cycle. The end of the combustion and beginning of the compression stroke happen simultaneously, with the intake and exhaust stroke occurring at the same time. This is a contrast when it comes with the 4-stroke engine that needs four strokes to complete a power cycle.

Advantages and Disadvantages

2-strokes have a high power performance in comparison with the 4-stroke. Also the 2-stroke has few moving parts that makes it lighter and simplify their structures. This engine type also have a low cost for maintenance. The disadvantage of this type of engine are lot more than its advantage. This engine type don't last that longer and lubrication is needed for the mixture of fuel gas. Poor lubrication may caused the engine to wore out even more faster. It may cost a little bit that it almost consume a gallon of oil in every 1,000 miles. The fuel economy with this engine is not that good as part of the mixture leaks out in the exhaust port because the intake and exhaust process occurs at the same time, making more pollution than other engine types.

The 4-stroke engine has better fuel efficiency than the 2-stroke engine. Less pollution and you can save more in terms of fuel consumption. You don't have to buy gallons of oil to keep it working that help you also to save more. This engine last longer than 2-stroke and durable for use. Has more torque making your engine quitter and more reliable performance. The disadvantages are 4-stroke engine cost much higher than the 2-stroke, maybe because of the materials and components use also its system. 2-stroke engine has more power making the 4-stroke only with half of its power in comparison. This engine is more complicated because of some additional parts in the mechanism like valves. Making this engine hard for troubleshooting and cost more higher.