HI. again, all this makes interesting reading, concerning my situation the Volvo Penta
2000 series 3 cylinder engine has a very expensive Cast iron mixing elbow. I had to buy a new one so I invested additional money
in having a specialist drag racing
shop ceramic coat it in side the water jacket and also the other surfaces exposed to the exhaust gas in the hope that will make it last longer in service
. The barbed fitting has a 45 millimeter outside diameter so all my exhaust pipes and fittings are thus. The water lock and rubber Hose was obtained from the boat we salvaged the engine from, Which incidentally was being fitted out to explore the South Pacific
The silencer was picked up as 'new old stock' from a local marine
store and the box had a rudimentary instruction leaflet in it. Some time later while poking around at the same store a 45 MM goose neck in its box was discovered in an obscure place at the top of the stairs. So I made a deal on it too. That box contained a real book with much clearer instructions and installation
diagrams. Option #3 seems to be most applicable.
So my point is this. It appears that almost every one just fits and clamps it all together as per the instructions. starts the engine and heads to sea?
Obviously that also seems to be my only option? However perhaps I have a more inquiring mind? I do like to know the details, So I have been trying very hard to find a detailed explanation as to exactly what is going on inside that piping system/ Vetus calls for a minimum length of 12 inches of rubber pipe between the mixing elbow and the water lock. Clearly within that short length of pipe there must be a lot going on with exhaust gasses in the 900 to 1,250 Fahrenheit range being sprayed with sea water that has been made warm after passing through the transmission
cooler and the heat exchanger
Thus My imagined area of concern is what state is the water in? as it leaves the water lock everything has to rise up though at least 2 feet of vertical pipe to get to the top of the goose neck. Water vapour does not have to be boiling... Because obviously clouds in the sky are water Vapour and they are not boiling. Thus IF this assent is made in the vapour state it presumably does not produce any noticeable additional back pressure.
IF on the other hand the pipe is flooded with water in the liquid state the diesel
engine is required to pump
it. That would consume a lot of available power? Does a water lock have to be 'cleared' every time the engine is started?