12/3/2023 0 Comments Frosty 33 rpm![]() ![]() The more disks installed, the more escape paths, so less back pressure, the less disks installed the more pressure and noise control. The Super Trap is one I've used many times and it's a clever setup, using perforated disks to redirect flow. Again the flow is redirected, but this time forced through a set of baffles. The louvers inside, squeeze the flow to a smaller diameter and the flow that eddies on the back side of each louver, are semi absorbed by the insulation.Ĭhambered mufflers are the most common and as the name suggests, redirection of the flow to get the pulses out of phase for noise cancellation and flow restriction.īaffled mufflers are the "tunable" types, such as the Super Trap. The straight through "glass pack" style of mufflers are restriction and effectively narrow the flow path, while permitting some sound deadening to occur with the insulation within it. You'd thing these were the same, but they're not. In smaller engines, pressure is generally handled 3 different ways restriction, baffled or chambered. ![]() This is one reason why manufactures use big, heavy cast iron manifolds, it keep the heat in the pipe. Thick wall pipe and 'glass wrapping are common tricks. Keeping the heat in the tube can make a significant difference in output. The cooler walls slow the gas flow as it scrapes along, which also slows the more centrally located gases. ![]() The walls of the pipe cool pretty quickly just outside the chamber. Keeping the flow centered in the outlet pipe is also quite important. Cones work the best, but small engines usually employ just a lip, which serves as a wall to slow the eddies of cooler exhaust gases, from curling back into the chamber. The idea is to prevent the slower moving exhaust gases that are clinging to the cooler exhaust port and tubing walls, from sneaking back into the chamber. On small engines a lip or reversion cone can be installed at the very opening on the port. What isn't commonly discussed are the tricks, such as reversion lips or cones at the exhaust port (helps prevent exhaust gas contamination), back pressure controls and temperature controls.Īnti reversion controls prevent exhaust gases from re-entering the combustion chamber when the port is exposed again, while gases are still evacuating. The basics are assumed, such as port matching and radiused flow paths. In the early days of 2 stroke diesel development a number of cute tricks were invented to address both issues and they've been used by hot rodders on 2 stroke (and 4 stroke) gas and diesel ever since. The higher the output of the engine the less back pressure you need. Both two and four stroke engines require a certain amount of back pressure to satisfy two basic functions, intake air/fuel mixture contamination (exhaust gases) and compressed gas containment. Please visit my store at justartrageous3, or email with any questions.Tom is hitting the real issue with exhaust modifications. We carry hundreds of hard to find collectibles, and canvas art at. I will ship worldwide, but will need to get a quote to specific destinations. Please let me know when you are finished with your shopping. I always combine items for savings on shipping, when possible. My descriptions are from my experience, and opinions from other sources. If you are looking for something special, please ask. ![]() I closed last December, and have lots of treasures to sell. Many items have been purchased, and were for sale at my collectibles shop. I have been collecting for many years, and in some cases, I don't have a lot of history on an item. Patina and slight flaws are part of the character. I do not repair any item, but will always try to describe flaws. Pictures are the best description, and please ask questions before you buy. All items are described as I accurately as can assess them. Most have been gently used, and will show normal signs of use. Occasionally, they can be found after being stored for many years, and are in pristine condition. No Paper sleeve.Ī note about vintage, most items are used, and are 20, 30 or more years old. Record and cover appear to be in good condition. ![]()
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