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Written by Turnmission Team
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Thursday, 17 December 2009 15:06 |
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First of all yes, this was also a forced induction system just like the turbocharger does. It forces more air to go into the cylinder with the same objective: more power. How can we get more power by just more air? Its because of more air is equal to more fuel to be injected into the cylinder, then it burnt together with the compressed air, thus more power is produced. In a very logical thinking, an engine that comes with forced induction can produce quite a lot more power than an engine that is same, but without the system.
Okay, now lets get into the point. We mentioned about its function is same as the turbocharger. So, what is the difference? If you have read or know about the turbocharger, it has a compressor to compress the air into the cylinder. The difference between supercharger and turbocharger is their “supply of power”.
The turbocharger compressor is powered by the exhaust waste gas while the supercharger is powered by a belt connected to the engine directly. The theory was just like the belt powering an alternator. Physically, this was just the only different between turbocharger and supercharger. And of course, the layout of both systems are different due to its power supply differentiation.
Now, we continue with more about supercharger. Upon personal observation, there are more cars using turbocharger instead of supercharger, and its popularity is among some of the cars makers only. For an example, Toyota seems using supercharger more on their vehicle while Nissan was more to turbocharger. In my opinion, both systems have its tradeoffs and why do car makers focus more on certain system is still their own preferences.
Here are some of the advantages and disadvantages of supercharger compared to turbocharger:
Advantages:
- There is less lag or almost no lag compared to turbocharger because the compressor runs by following the belt connected to the engine.
- Immediate respond can be felt due to its all-rpm operation, while turbochargers only boost when the turbine spools up which normally starts from certain rpm only.
- Supercharger tends to run less hot compared to turbocharger.
- It is easier to install compared to turbocharger.
- Full range of low-end and medium range power.
Disadvantages:
- Supercharger is more expensive compared to turbocharger.
- It is inefficient if compared to turbocharger because turbocharger operates using exhaust wastage while supercharger was using ‘fresh’ energy from the engine.
- Since the energy is produced by the ‘fresh’ energy from the engine, it causes a direct load to the engine, thus this dragging lowers the engine performance.
- More physical space needed to bolt a supercharger compared to turbocharger.
- Usually does not have the top-end power.
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Blow-off Valve and Wastegate explained |
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Written by Turnmission Team
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Wednesday, 16 December 2009 00:25 |
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First of all, for you guys who do not have an idea on what blow-off valve and wastegate is, have you wonder why some car does sound like “psssssttt” when they let go their gas pedal during gear changing, etc? and some even have weirder or cooler sound? blow-off valve or wastegate is the answer for that question. They play around with different type of blow-off valve or wastegate for different purposes.
As for some of you, once you heard that sound you already know that car was a turbocharged car. Or it might be a supercharged car as well. But you might be unaware that the sound was actually produced by the blow-off valve or wastegate.
What are blow-off valve and wastegate? Basically, they were two different devices that do the same job on a forced inducted car. They purge excess pressure that was generated by the compressor to avoid bursting the engine or the forced induction system itself. So, normally a forced inducted car will only have either a blow-off valve or a wastegate. Now we will look further into these two devices.
Many people confused between blow-off valve and wastegate because of their similar task that they perform but actually they works in a different way. The wastegate regulates away exhaust gas from the turbine wheel when a dangerous amount of exhaust gas is detected by a sensor at the inlet of the turbine. This in turn causes the turbo compressor to spin in a limited and controlled speed. In simple words, it was a gate controlled by an actuator to feed in certain amount of air to spin the turbine, hence the name wastegate, a gate which regulates the waste. However there are two types of wastegate, the internal and external:
- Internal : it is a part of the turbo system itself in the turbine housing, regulating the extra exhaust gas back to the exhaust controlled by an actuator.
- External : separated part of a turbo system, regulating the extra exhaust gas back to the exhaust or to the atmosphere and does not requires an actuator. High performance wastegate seeker goes for this type.
Now we see about the blow-off valve. A blow-off valve is installed after the compressor and before the throttle plate. When an engine is pushed hard, logically the compressor generates a lot of compressed air heading towards the engine cylinder. What happens if the driver let off his right foot? The throttle plate will close and thus bounce backs the extremely high-pressured air. This will lead them into the compressor and will cause it to stop spinning or seize!
Thus, by using a blow-off valve, it regulates the extra air out to the atmosphere once the need is detected and this will also keep the compressor spinning happily without the need to spool it up again when the driver accelerates.
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Pullout : A Brief Honda Engine History and Tech |
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Written by Turnmission Team
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Sunday, 29 November 2009 23:49 |
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This is a pullout from Honda Owner's Magazine Vol.12 Sept 2009. It briefly introduce Honda Engine's tech and also the history of it. It is a very interesting and informative pullout. Enjoy !!
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Last Updated on Sunday, 29 November 2009 23:57 |
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Written by Turnmission Team
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Sunday, 19 July 2009 23:18 |
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Generally every car has tyres and wheels. They are the only components that have direct contact with the ground, thus it greatly affects the driving performance, noise and riding comfort. Tyres are made of rubber and normally is in black which covers the wheels that made of steel or alloy such as aluminum, magnesium and so on. Prices vary for those. For beginners, there are some 'codes' written on the tyres and wheel that you might don't know what it means. Below is the guide.
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Written by Turnmission Team
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Sunday, 19 July 2009 23:17 |
Definition: Remember the engine cycle phases? One of the phases is where the spark plug ignites and thus powering the car to move. So, the definition of the ignition system is a system to ignite a compression mixture.
Looking at the above figure, the car's battery just carries 12V. You must be thinking are you kidding? Because a car was such a powerful machine, it shouldn't work by just relying on a 12V battery. No! You are wrong. Although the battery
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