4/6/2023 0 Comments Cylinder head porting kit![]() ![]() So the dimples would (in theory) help create this boundary layer of air that would keep the fuel off the wall and in suspense and atomized.įirst off, more than likely you have an engine with modern fuel injection if your reading this. Modern fuel injectors do an excellent job of atomizing the fuel, especially with todays engines where injector location is engineered very carefully for optimized delivery. In a port, we are looking to create a situation where fuel stays off the wall of the port. The argument is that it works on golf balls because it creates a boundary layer of air and helps it move the ball faster and farther. W hile we are on the subject, we should touch on dimple ports. However, because there are cylinder head guys out there who do such a poor job hand porting, seemingly haven taken lessons from a blind person with a hammer and a chisel, they help perpetuate the myth that CNC porting is more accurate or “better”. Talking about consistency machining an inconsistent part makes no sense except to market it as the best option. ![]() So, instead of waiting weeks or months to get it back from the machine shop, someone with a CNC could rip through it in a few hours and have it on the floor ready for machine work. While a CNC is better than a hand at many things, when it comes to porting your factory cast cylinder head it is really just faster, meaning it’s faster than any human could grind and sand your head. Meanwhile, a hand knows the center of that port every time. ![]() That’s because the CNC machine does not know where the ports are, just where they are supposed to be. You can even see where the CNC did not touch the casting in one port but did in the others. In fact, in the head there is no ports that are the same. That’s where the words “core shift” comes into play, because when we get cast heads back from the CNC shops there is not one that is exactly the same. I say this because the factory head is cast, which means there will be some variation from head to head because of the imperfections that come from the casting process. But when it comes to CNC machining a factory cast cylinder head, talking about the accuracy of the machine is a moot point. If your making billet heads, the accuracy of the CNC is worth talking about, because you’re making something from scratch and making a batch of them ensures that they will all be the same. T his one depends on the piece in the machine. Dave and his team have amassed a huge amount of experience and expertise and are now creating some of the best performing cylinder head and cam packages for both domestic and import vehicles, be it for street/strip use or full blown race applications. About the Author: Dave Localio is a long-time friend of ours and the owner/operator of Headgames Motorworks, a cylinder head specialist founded in New Jersey in 2001. ![]()
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