Comments by "Makan Tahi" (@makantahi3731) on "driving 4 answers"
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@kaisertrinityt.m.i.s1607 on chanel burns headers, stainless steel, they adviced to use inconel but it is to expansive, second was AISI321 it is unavailable for me and third was AISI 316 that i can find but is double price than AISI304, 15€ per metre for 42.4mm diametre , 1.5 mm wall tickness, i have old header as template that was made with 40mm diametre tubes, that was to narrow, welds were made too rough, with no cone/spike in 4in1 collector, etc, and benefit was on rpm 2500-3500, after that it choked engine, so much that o2 sensor was bent inside of collector
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@igornoga5362 one lesson from aerodynamic, if you have ad tunel with smaller diametre,in middle and after expands,(venturi tube) and forces some gas(air) to flows , as raises pressure , speed raises , until pressure reachs 1 bar , in smaller diametre, speed reaches 1Ma, if pressure raises more, speed in smaller diametre is still 1 Ma, but in part of tunel where diametre expands, speed starts to raise over 1 Ma, so you have supersonic speed, same is in exh primar tubes, gasses from cylindre are under pressure and when exh valve opens it expands into primar tube or collector with supersonic speed, with no muffler you will hear bangs-what is supersonic expansion
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