The oil pan on an ERA car is about 7 1/2 deep. If I remember correctly, my engine (351C) measured about 20' tall from the oil pan rail to the top of the filter. It will clear 75 mm on the inside and is 100 mm tall overall. While it might flow less per square inch, more pleats means more overall square inches. I used 50mm tall stacks, the shortest TWM offered. A more restrictive filter can flow equally or better than a less restrictive air filter if it utilizes a larger surface area, more pleats. Blowing on a small surface area and feeling resistance is the sort of thing that created the myth. Unless people are riding through gravel roads or roadworks constantly, theirs will be similar. I put 42,000km on the stock filter and it was still fine. ![]() Serviceability of aftermarket air filters isn't a worthwhile reason either, unless you're in extreme environments. It's just a joke to me that people pay more to swap out the stock filter for something that filters less while providing no change in performance. I realize this thread isn't really about the filter. Would be cool to see that tested on a dyno. Full exhaust, modified airbox, velocity stacks. My guess is that the large stock air filter won't show much restriction, if any, until the high end of mods. The filtering difference between stock and modified may not be as dramatic as your case, but certainly ought to be significant enough to draw comparisons. They're testing free flowing filters vs stock paper filters, panel and pod. While it might flow less per square inch, more pleats means more overall square inches. While slight gains can be seen by pointing the velocity stack into oncoming air without the filter, this puts the engine at risk as unfiltered air can cause unwanted debris to enter your engine.Click to expand.That's the whole point of mythbusting. There was a discussion about making a short velocitystack INSIDE a k/n filter here for a while. In fact, those grills to stop the rabbits getting sucked into your carbs are already a very bad idea on velocity stacks. NOTICE: Hybrid Racing recommends always running the filter on the cold air intake. A filter in a stack will seriously upset airflow, and defeats the purpose of a stack. Fully assembled, the filter and velocity stack has a 6.25" overall height and 7.5" diameter. The velocity stack has a 2.25" overall height. All you need to connect it to your 3" cold air intake is a 3" silicone coupler and (2) hose clamps. The velocity stack has a 6" inlet and a 3" outlet. Included in each kit is a velocity stack, filter, and a hose clamp to connect the two together. That said, the same sort of benefits can be seen by adding a similar bellmouth (in this case a velocity stack) to the end of your cold air intake. Hybrid Racing 6' Velocity Stack and Filter for 3' diameter intakes. Fits 3-1/2 - 5 Diameter Velocity Stacks, Blac. This bellmouth is added because it increases the efficiency of air moving through the pipe by as much as 70% in the right situations. Velocity Stack Pre-Filter/Fits 3-1/2- 5 Diameter Velocity Stacks: Velocity Stack Pre-Filter Booties. ![]() If you've ever looked inside an intake manifold, you've noticed a curved "bellmouth" profile at the inlet of each intake runner. A well-designed cold air intake and high-flow cone filter are great ways to let your engine breath better, but a filter on the end of a pipe has its limitations. Go-kart air filters function just like ordinary car air filters they are just shaped to fit a smaller intake. Paying close attention to how air flows into and out of your engine is an obvious place to start making modifications for optimal performance. When it comes to getting the most power out of your engine, the devil is in the details. Our Stack Covers prevent any outside contaminate from entering your engine while maintaining horsepower due to our patented design. ![]() These filters are made with a fine stainless steel mesh and silicon end cap for a snug fit that is easy to apply.
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