Re: '84 E10SELCRA Exhaust question
I think perhaps I'm brain dead! I cant follow your description and the pictures!
I'm not sure if you are saying that you just dont get any gases out of the prop or whether the thing is designed so that they cant exit via the prop.
However what I do know is that the 6 and 8 Hp versions have the normal exhaust outlet plugged and all the gases escape via two (rectangular) outlets in the side of the extension (picture from an '84 brochure in the clickable thumbnail below)
On that basis I would not be surprised if yours is also designed so that the gases all escape from the outlet at the bottom rear of the extension.
Another picture on the facing page, which I have not scanned, shows gases escaping from the six little holes in the side of the lower unit when going astern (as they would with the non sail version)
I think the sail versions are designed to deliberately put the props deeper in the water than normal. This means that the normal exhaust outlet would also be deep and cause excessive back pressure. Hence the specially placed outlets on the sail versions.
Click the thumbnail and then click the image to get it full size and clear
Taken another look at your pictures now. It appears that the extension is designed so that the gases cannot go down to the prop! It is a special extension for the sail version. The gases escape from the outlet at the bottom of it but can escape from the 6 holes in the side of the LU when going astern. I'm happy hope you are!