{"product_id":"spark-exhaust-bent-tube-30-degrees-54mm","title":"Spark Exhaust Bent Tube 30° Ø 54 × 1.0 mm Stainless Steel Universal G9107","description":"\u003cp\u003eFifty-four millimetres through thirty degrees. A collector-section diameter, in the angle that reconciles two fixed points at either end of a long run.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMandrel-formed 30° bend, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 54 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends for cutting and welding.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 54 mm straight tube, article G9003.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9107, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTwo Fixed Points and a Bend Between Them\u003c\/h2\u003e\u003cp\u003eOn a four-cylinder build almost nothing about the exhaust is free. The collector leaves the engine where the header geometry puts it; the silencer has to arrive at a mount the frame decides. Everything between is the fabricator's problem, and a shallow bend is the tool for it.\u003c\/p\u003e\u003cp\u003eThirty degrees changes direction little enough that the run still reads as a straight line and enough to move the far end by a useful amount over half a metre.\u003c\/p\u003e\u003ch2\u003eAngle Against Length\u003c\/h2\u003e\u003cp\u003eThe further the silencer is from the bend, the more a small angle moves it. A thirty degree deviation displaces the end of a 400 mm run by around two hundred millimetres — which is why a shallow bend early in a system has more effect than a sharp one late in it.\u003c\/p\u003e\u003cp\u003ePut the correction where it does the most work and the system needs fewer pieces.\u003c\/p\u003e\u003ch2\u003eGrowth in a Long Run\u003c\/h2\u003e\u003cp\u003eStainless expands about seventeen microns per metre per degree. A metre of pipe going from cold to five hundred degrees grows more than eight millimetres, and a bend is where that growth turns into a bending load rather than a sliding one.\u003c\/p\u003e\u003cp\u003eOne sliding joint per run absorbs it. A system welded solid at both ends cracks at a tangent weld, usually within a season.\u003c\/p\u003e\u003ch2\u003eWhere the Mount Goes\u003c\/h2\u003e\u003cp\u003eNot on the curve. A bracket welded to the outside of a bend puts a hard point on the part of the tube that is already thinnest and most stressed. Weld the tab to a straight section and let the bend float.\u003c\/p\u003e\u003ch2\u003eClamping It\u003c\/h2\u003e\u003cp\u003eOnly on the tangents, and only with soft jaws. Fifty-four millimetres of one millimetre wall takes a permanent set from bare vice jaws in seconds, and an oval end is what stops the next joint going together.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Available in 30°, 45° and 90° at this diameter.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618102599946,"sku":"G9107","price":18000.0,"currency_code":"XOF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0e93bf52ec0_cdc16130-75f3-4e93-8ab8-bb01366cd2d8.png?v=1788354219","url":"https:\/\/inter-pace.com\/en-ci\/products\/spark-exhaust-bent-tube-30-degrees-54mm","provider":"Inter-Pace","version":"1.0","type":"link"}