TIP: Be sure to replace your exhaust port gaskets any time you change or reinstall pipes. So what does all of this mean? To best answer this question let’s look at a few different exhaust designs and how they handle the above listed conditions. Bigger is not always better and a larger pipe will actually slow this velocity thus restricting flow. For the most part all stock Harley engines require a 1-3/4? diameter pipe to maintain 300 fpm. The optimal velocity is 300 feet per minute. This is the rate at which gas travels through the exhaust system. The thermal pulse also reverses direction at the end of the pipe but unfortunately travels at a different rate, thus reaching the combustion chamber at a different time. Similar to sonic pulse, this is a wave created by the hot gas exiting the exhaust valve. Torque cones can sometimes reduce this condition. Under the right (or wrong) conditions this wave will even push some of the air/fuel mixture back through the intake valve into the intake, a common occurrence with short drag pipes. The wave will also pull exhaust gas back along its path and if it reaches the open exhaust valve the gases will dilute the air/fuel mixture in the combustion chamber. This pulse travels through the exhaust and at the end of the pipe actually turns around and heads back toward the exhaust valve. Sonic pulse, thermal pulse, and exhaust gas velocity. Without getting into a lesson in physics there are three factors that effect the performance and tuning of an exhaust system. For anyone interested in what will improve performance or why those drag pipes made your ride a slug please read on. 2018 Harley-Davidson Road Glide Ultra - $25,995 (Certified Pre-Owned)If you answered yes to #3 then you’re probably going to put whatever looks cool on your bike and not worry about how it runs.2018 Harley-Davidson Road King Special - $22,495 (HUGE Inventory).We offer the largest selection of Parts and Accessories, Motorclothes / Apparel, and the #1 rated Service Dept. Wild Prairie Harley-Davidson is your premier New and Used Dealer in the Minneapolis / Twin Cities, Minnesota area with 300 New and Used Harleys in stock. 2018 Harley-Davidson Road King Special - $22,495 (WE CAN FINANCE YOU).We offer the largest selection of Parts and Accessories, Motorclothes /Apparel, and the #1 rated Service Dept. Twin Cities Harley-Davidson is your premier New and Used Dealer in the Minneapolis / Twin Cities, Minnesota area with 300 New and Used Harleys in stock. 2018 Harley-Davidson Road King - $18,999 (EZ Financing).2018 Harley-Davidson Road Glide Special - $29,999 (EZ Financing).Southern Thunder Harley-Davidson is your premier New and Used Dealer in the Southaven, MS, and Memphis, TN area with the most New and Used Harleys in stock.
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