sord wrote:
There really is not that much black smoke (I have had really black smoke when I had to reverse full throttle to avoid an accident) It was more a question as to where is the air intake as it seems to be buried under a lot of cooling pipes, exchanger, etc. Without taking half the engine apart is there any way to clean the air intake? Does the air actually enter the engine through a 1/2 inch pipe coming from the silencer? Does not seem like that will provide much air.
My prop was made for my engine (Kiwi prop) from the engine specs. I generally run at a max speed of 7.3 knots with the engine running at 2700 rpm. the bottom and prop are pretty clean as I haul every winter, have anti-fouling and am in a relatively clean lake (Lake Huron)
Take a look at this pic.
Piece 1 is the exhaust manifold and intake manifold combine. The air silencer sits on top of Pc 1, the air goes unrestricted thru the manifold and the exhaust comes back thru the manifold to the exhaust elbow. Both are in separate cambers, but both are running thru the manifold. The little hose Pc 6 is for positive crank case ventilation.