You will also need an air compressor and an air-operated, high-speed grinding tool. Since an internal combustion engine is basically an air pump (and the more air you put in and take out, the more horsepower it makes, and the more efficient it is) the “free” horsepower provided by the porting and polishing operation makes more sense.įirst of all, you will need good eye protection. Computer Assisted Design has improved the shape of stock cylinder heads in recent years, but there is still some “free” horsepower and fuel economy to be had by “cleaning up” the intake and exhaust ports as well as removing some of the sharp edges from the combustion chamber as well. Of course, the reason automobile manufacturers don’t port and polish during the assembly process is that, as you will learn, it is very time consuming. Now let’s take a look at how you can do yourself! Manual Porting & Polishing Once you understand the process of port/polish work and the results of this modification, it’s easy to see how it helps engines make more power by increasing the efficiency of the intake and exhaust streams. The engine can rid itself of spent exhaust gases more efficiently, thus by reducing what is called “exhaust backpressure”, port and polish work helps decrease the amount of work your motor has to put in to getting rid of spent fumes. These faster speeds not only allow the engine to breathe easier, they also help the fuel to mix with the intake air more completely once inside the cylinders, which increases burn efficiency.įinally, a port and polish job can have the same effect on the exhaust stream as it does on the intake by removing restriction and increasing the flow capacity of the exhaust ports. Removing imperfections in the surface of the intake tract reduces air turbulence in the intake port which allows air to enter the cylinder at faster speeds. The more air that is drawn into the engine, the more fuel can be mixed with it and burned, resulting in more power. Port and polish work helps the engine to make more power in three different ways.īy making the intake ports bigger, port and polish work removes restriction from the intake stream which makes it easier for the engine to draw in fresh air. This removes flaws and/or obstructions from the surface of the inlets, allowing air to flow more rapidly into and out of the cylinders. The enlarged ports are then smoothed over using a sanding or grinding tool. The next step in the process is polish work. The enlargement of the inlets is what is referred to as “porting”. This extra room helps the engine to draw extra air into and out of the cylinders, mixing it with more fuel which means more power. First, the intake and/or exhaust inlets (ports) on the cylinder head are enlarged using a grinding or cutting tool. Port/polish work is a relatively simple process that is performed on the engine’s cylinder head. First, we’ll look at what exactly port and polishing is and then how and why it adds power output when we port and polish a motor. Port and polish work is a relatively simple process and it adds power because of some relatively simple principals. Many people have heard the term before but fewer people know exactly what a port and polish job is or what it does. A port and polish job is one way to increase the power output of any internal combustion motor.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |