{"product_id":"spark-exhaust-stainless-tube-48mm-500mm","title":"Spark Exhaust Stainless Steel Tube Ø 48 × 1.0 mm 500 mm Universal G9012","description":"\u003cp\u003eForty-eight millimetres. Past the point where a tube is a link pipe and into the diameters used for collector sections and the run behind them.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStraight exhaust tube, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 48 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003e500 mm long.\u003c\/li\u003e\n\u003cli\u003eFabrication stock, supplied uncut.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9012, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCollector Territory\u003c\/h2\u003e\u003cp\u003eOn a four-cylinder engine the header runs meet at a collector and everything after it carries four cylinders' worth of gas. That section is typically between forty-five and sixty millimetres, and forty-eight sits comfortably inside that band for a middleweight.\u003c\/p\u003e\u003cp\u003eOn a large twin it works as the whole run from the header junction back.\u003c\/p\u003e\u003ch2\u003eDeburring the Inside\u003c\/h2\u003e\u003cp\u003eEvery cut leaves a burr on the inner edge, and on a 48 mm tube that burr sits directly in the gas path. It costs flow, it collects carbon, and on a slip joint it stops the two pieces going together cleanly.\u003c\/p\u003e\u003cp\u003eA round file and thirty seconds fixes it. It is the step most often skipped and the one that shows up later as a joint that will not seat.\u003c\/p\u003e\u003ch2\u003eThermal Movement\u003c\/h2\u003e\u003cp\u003eStainless expands roughly seventeen microns per metre per degree. Over half a metre of tube going from cold to five hundred degrees, that is more than four millimetres of growth — which is why a system welded rigidly at both ends cracks, and why Spark's own systems use sprung slip joints.\u003c\/p\u003e\u003cp\u003eBuild in one sliding joint per run and the problem disappears.\u003c\/p\u003e\u003ch2\u003eOvality\u003c\/h2\u003e\u003cp\u003eTube arrives round and stops being round the moment it is clamped hard. On a thin-wall 48 that matters at the joints: an oval end will not slip into a round sleeve. Clamp on a mandrel or on a wooden vee block, not in a bench vice.\u003c\/p\u003e\u003ch2\u003eBends in This Size\u003c\/h2\u003e\u003cp\u003eSpark offers 48 mm as a ready-made 30°, 45° and 90° bend. There is no 180° at this diameter — only 45 and 50 are bent that far.\u003c\/p\u003e\u003ch2\u003eClamp Sizes\u003c\/h2\u003e\u003cp\u003eSpark's own clamps are listed at 43.5, 47.5, 53.5 and 63.5 millimetres — sizes chosen to close around a joint rather than to match a nominal tube. A 48 mm tube inside a 52 mm sleeve sits inside the 53.5 clamp; the 47.5 goes directly around bare 48 mm tube.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne 500 mm length per article, no cut-to-size service.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53617860903178,"sku":"G9012","price":21.01,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0fcb22c4a53_6582728a-e5a1-4747-bf73-3a8590b0aef9.png?v=1788362714","url":"https:\/\/inter-pace.com\/en-tr\/products\/spark-exhaust-stainless-tube-48mm-500mm","provider":"Inter-Pace","version":"1.0","type":"link"}