Hi again,
so we were heading out yesterday and straightaway realised that there was reduced water flow from the exhaust so I turned round at the end of the finger and moored up again.
I had a look today (it's a Bukh 10hp) and after checking that the impellor is good (it was new couple of months ago) I thought I would check the exhaust for blockages and found that the exhaust flange has corroded away from the elbow which is a stainless custom piece.
I pulled off the blue plastic water mixer I think it's called and it had some rust pieces in that so I cleaned it out.
I've removed the flange and am thinking I can get it welded somewhere on the Sunny Coast with a new piece of pipe to either slide inside the ss elbow as it was or maybe to the outside as the inside of the ss elbow has the remains of the old pipe very securely stuck in it.
So I'm wondering is the diameter of the pipe off the exhaust flange critical or would it not matter if it was increased to go over the ss elbow rather than inside it as before?
And while on this subject does the length of the rubber exhaust pipe from the blue water mixer to the transom outlet affect engine power or economy? On mine there seems to be around 3 meters which goes up in a loop above the waterline, then down to floor level again and finally up again the the outlet? Does this seem a lot or normal?
If it was longer than needed would it be ok or have a negative impact on power?
cheers