Day 190, HVAC air dirtribution redo, adding checkvalve to AC water discharge to prevent pump from drying. Engine, cooling system modelling, Dry bilge collector.

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Weekend off.  I lost previous weekend because stuck in business trip. No post sometimes means nothing done,

 Air conditioner

 Since I took engine home I had a problem.  HVAC water pump was not able to start due to waterline appeared below pump level resulting water run out of pump. As soon as pump ins not self priming it did not work.

To fight the situation I added  check valve near AC water discharge preventing water run back and let air to pump.

 

Originally, I built some king of silencer here, but it took a lot of volume and really did not silenced ait flow too much.  So, silencer removed and replaced with Y duct now. 

Second thing why I gigged here was the  problem with electrically controlled valves. I thought one of them just broken, but it appeared the issue in connecting them in parallel. DO not connect these valves in parallel, otherwise they back feed each other and never stop. Decoupling diodes must be installed on the ground lines. 


Dry bilge

3D printed  new intake box for dry bilge out of TPU material, it will not crack again.

Engine

Just measurement of height available in engine compartment.

 

Mocking up fresh water  cooling system.

For prototyping  I decided to use  copper pipes and solder them in required shape.

I built manifold to organize water flows.  Blue arrows show short cycle (cold engine), red arrows represent long cycle (hot engine).


To accommodate heat exchanger I had to make new bracket to move on engine fuel filter lower.
Later will make new fuel hoses to keep fuel lines in order.

 

To mount heat exchanger I made custom bracket mounted on exhaust manifold.
Just another view.


 

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