Thought I'd reinstate this thread as it was pulling up some good info with regards to endtank design.
From looking at the original IC design it looks like the plastic endtanks may have been employed so they could obtain a good tank design cheaply? The original IC does seem to perform to a resonable standard without being overly large.
I've attached a couple of pics to this post and a pdf article that looks into endtank design.
The first pic is of the standard IC alongside an aftermarket , 'improved one' , the second pic is how I think the aftermarket one could be improved further.
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