{"product_id":"spark-exhaust-bent-tube-30-degrees-48mm","title":"Spark Exhaust Bent Tube 30° Ø 48 × 1.0 mm Stainless Steel Universal G9147","description":"\u003cp\u003eForty-eight millimetres, thirty degrees. Past link-pipe territory and into the section that carries four cylinders at once.\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 48 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 48 mm straight tube, article G9012.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9147, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAfter the Collector\u003c\/h2\u003e\u003cp\u003eOn a four-cylinder engine everything downstream of the collector carries the whole output, and that section is typically between forty-five and sixty millimetres. Forty-eight sits comfortably in the middle of that band for a middleweight.\u003c\/p\u003e\u003cp\u003eOn a large twin it works as the entire run from the header junction back to the silencer.\u003c\/p\u003e\u003ch2\u003eSupporting a Bend\u003c\/h2\u003e\u003cp\u003eA bend is where a system flexes and where it cracks. The weld at the tangent is a stress concentration, and hanging a heavy silencer off the far side of one without a mount in between is asking for a failure.\u003c\/p\u003e\u003cp\u003ePut a mounting point within a hand's width of the bend, and make at least one mount in the system rubber-isolated.\u003c\/p\u003e\u003ch2\u003eWhy a Factory Bend at This Size\u003c\/h2\u003e\u003cp\u003eForty-eight millimetres of one millimetre wall is at the edge of what a home setup will form without collapsing. The material is thin, the diameter is large, and the ratio between them is exactly what makes a tube fold rather than bend.\u003c\/p\u003e\u003cp\u003eThirty-two euro against two ruined lengths and an afternoon is not a close call.\u003c\/p\u003e\u003ch2\u003eDeburring After Trimming\u003c\/h2\u003e\u003cp\u003eCutting a bend to length leaves a burr on a curved edge, which is more awkward to reach than a burr on a straight one. A half-round file and a rotary burr in a die grinder both work; a thumbnail check inside the bore is the test.\u003c\/p\u003e\u003ch2\u003eClocking Before Tacking\u003c\/h2\u003e\u003cp\u003eA bend has a plane, and rotating it about the tube axis swings the far end through an arc. On a run with two or three bends in series, that rotation is the entire adjustment available — and it has to be right before the first tack, because afterwards the only correction is a saw.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45° and 90° at this diameter. There is no 180° — only 45 and 50 are bent that far.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618098602250,"sku":"G9147","price":18000.0,"currency_code":"XOF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087da05eda99_3924fb49-da5b-4e14-8ed0-9a38f6f62ac6.png?v=1788347450","url":"https:\/\/inter-pace.com\/en-ci\/products\/spark-exhaust-bent-tube-30-degrees-48mm","provider":"Inter-Pace","version":"1.0","type":"link"}