Aluminium Exhaust Heatshield

Everything I make starts out like this. It's a cardboard mockup based on the Gordini heatshield but modified to suit the R4.

Card is great for templating - it behaves in much the same way as metal but is easier to cut and add bits on as you iterate towards a final design.

Having worked out a good shape the dimensions of the much modified cardboard template were transferred to 2mm aluminium sheet.

The sheet was cut out using a jigsaw, then folded around the edge of the bench using blocks of wood and clamps to hold it in place.

I don't have any room at the top of the heatshield for a pipe to the air filter, so decided to take the hot air from the side of the heatshield.

The aluminium pipe in the photo was folded from sheet using a vice to pull it around a metal former.

The pipe was seamed together using an AC TIG welder. This was my first attempt at TIG welding aluminium. I'm learning TIG so didn't expect it to turn out quite so neat, and I found it so much easier than previous aluminium work using a MIG welder.

Sadly all the welds in this photo will be hidden in the car, and the visible ones done later on didn't work out quite so well - need a little more practice.

Here's a trial fit of the pipe into the folded heatshield. It's a fairly involved shape, the diagonal bend is there to clear the flange at the end of the exhaust manifold.

Here's the new heatshield in place. It's a little tight on the top hose, but otherwise has worked really well.

I've just about enough space to fit the jack between the heatshield and the brake servo, and that will completely fill the engine bay.