Hummer H3 exhaust headers/manifold (Part 3) Make equal length headers time lapse

Part 3. Design and creation of the equal length of the exhaust headers (manifold). Hummer H3 with a five cylinder inline engine L52. The most creative stage. This is the creation of an equal length geometry of the exhaust manifold. Here, imagination and spatial thinking work hard. The main task of exhaust manifold is to clean the combustion chamber from residues of combustion products as fast and efficiently as possible. The design of the headers has a great influence on the engine power parameters. Many factors determines the «correctness» of the design. An important element of the system is the fusion section of the exhaust gas streams. I show this section in the first part of movie. Link for the first part of movie below: https://youtu.be/W-aOiKD6h9Q Minimal twists of cylinders flows and correct consolidation of 5 runners into the one raise torque level on the low revs. The exhaust cycle of one cylinder should not make any obstructions for exhaust gases output from other cylinders, but should help their purification. The volume of exhausted combustion residues depends on the working volume, shaft speed and engine load. The larger the volume of each cylinder than the larger diameter of primary output pipeline from this cylinder. It’s not possible to provide the required flow rate of exhaust stream if the diameter of the primary output pipeline is too big. Reducing the speed of this flow rate leads to reduction of torque and a significant reduction of the flow rate also leads to the reduction of the engine’s max power. Reasonable compromise between speed and flow rate provides good torque level on low revs and sufficient engine thrust on high revs. The length of the primary pipelines effects on engine’s power parameters. Increasing of this length improve thrust on low revs while its reduction improves thrust on high revs. Time difference between the reflection and return of shock waves in the exhaust gases in the cylinder depends on the length of the output pipelines. This explains the dependence of engine thrust on the length of the pipeline. I made the jig fixture, template of the original Hummer 3 factory exhaust manifold. Link for this video below: https://youtu.be/VGiX4U52iDE Between the head of cylinder block and flange of input flange of exhaust system need to build equal length headers , runners of exhaust manifold. Like any creative process, making “curls” of pipes takes a lot of time and efforts. There are many options and find the best one is not so easy. The first fitting to the car show errors of the manifold’s design and added new elements in the former. The next several options were beautiful, correct by all accounts but turned to not quite equal. Usually I assume possibility of runner length difference within 1-2%. Majority of atmosphere exhaust manifolds, which made according to factory sizes, has length around 60 cm. I made design also with average 60 cm length of runner from flange of head of cylinder block to place where it consolidate into the one. This length is without tunnels inside the head of cylinder block. The final geometry and final welding of this manifold will be in the next series … Wait for your comments, questions and suggestions. My ►instagram: https://www.instagram.com/eclipse.razor/ https://www.instagram.com/sergbush/ ►FB: https://www.facebook.com/serg.bush.5 ►VK: https://vk.com/neomadc Liked the video? Click to subscribe, put like and do not forget about the bell! ►Subscribe here: https://www.youtube.com/user/neo20011?sub_confirmation=1 My work and editing of the video too, so if something is wrong then write what and why?))