DIY Turbo Manifold Design

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Last week we backgrounded the making of a custom turbo manifold. This week we look at the process of constructing a four cylinder manifold from heavy gauge buttweld fittings. If you have a bench grinder, hacksaw, vice and access to an experienced welder, it’s easier than you think! In the second half of this article we take a look at turbo manifold design. Step-by-Step Half a metre of 100mm x 12mm flat bar was purchased from a metals dealer at a cost of AUD$16. Using chalk, the shape of the exhaust manifold gasket was traced onto the bar. Because the openings in the head gasket are larger than the internal diameter of the ports, an appropriately sized washer was used to mark the port openings. An oxy acetylene torch was used to cut out the manifold plate. The cut was made on the outside of the line so that the resulting plate is a little larger than the gasket. The holes were cut on the inside of the marked line. A local welder did all the cutting and welding – his total time was 5 hours.

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