What’s this thing called?

[SimonR]

I’m pretty sure that I have a leak between my wastegate and exhaust manifold. It sounds like a blowy exhaust would and I’m losing boost (leak test seems to show no other leaks).

 

Making up terminology as I go along, the ‘plunger’ thing in the wastegate doesn’t seal against the interface to the manifold (it clearly isn’t designed to, there is a large gap between the plunger and the wastegate housing) and when the system was put together we improvised with a metal gasket which was modified to create a seal.

 

I recently had to take the manifold off to have a crack welded and it’s clear that the gasket has bent and cracked (not surprising, it was bearing the force of the wastegate spring).

 

In the piccy there is a flange/seal thing which looks as though it is intended to do the job I need. Unfortunately, the wastegate never came with one which was why we had to improvise.

 

Here’s the question – what exactly is the thing in the pic called? I’m going to need to order one over the interweb and if I don’t have the correct name it’s going to be difficult ordering the right thing. Also, do these HKS wastegates come in different sizes – ie once I know what this thing is called will there be different sizes to choose from?

[heckler]

sealng flange? Or just flange?

[SimonR]

Thanks, 'sealing flange' took me in a different direction and it seems that HKS made these as separate items so that they can be replaced when necessary. I reckon it's the 'inlet base plate' part no 1499-RA052 in this catalogue http://www.hksusa.com/content/pdf1581.pdf. Can anyone confirm? It's defo the 50mm version of the wastegate btw.