21111 SLP Bellow Kit Corvette Blackwing

Charge air bellows are used on diesel truck engines to deliver pressurized intake air through the charge air intercooler into the intake manifold. Meta-Aramid reinforcement is required since the temperature of the turbocharger outlet is approximately 260C+ (500F+). Fluorocarbon lining is used inside the bellows since crankcase fumes are also recycled through the bellows. High-temperature fluorocarbon elastomer liner, reinforced with a minimum of 4 plies of temperature resistant Meta-Aramid fabric. The bellows has four external convolutions and three stainless steel external pressure retention rings. The stem the hose is clamped to must be round, clean, and smooth without flat spots caused by the grinding of casting flash or burrs. The stem must have a bead height and profile equivalent to SAE J 1231 Type 1, Type 2 or Type 3, with 32.5mm centerline to centerline distance between tube beads. The bead must be continuous for 360 degrees around the OD of the stem for proper sealing of the hohave finally found a (relatively) cheap fix for the little plastic ball joints on the variable air intake bellows. One of these arms has been broken on my car since I bought it, my local Audi dealer quoted £160 for a replacement kit including all the plastic arm components and bellows, but all I needed was one little plastic ball joint arm, so I thought this was a bit too expensive.

The fix is quite straight-forward, all you need is 4 x steel ball joints for 8mm dia. balls, you can buy them from RS Components, part number 689394, £8.76 per pack of 4. I have also seen stainless steel ones but they are more expensive.Unfortunately you need to cut them down quite a lot which means you chop off the threaded end so you need to tap them all the way down, they are actually drilled deeper than they are threaded, so no need to drill thankfully. BTW its easier to tap them before cutting them down because you can use the existing thread to guide the tapping tool.

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