SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: JackB on July 10, 2013, 08:01:35 PM
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I've been reading how to setup the plumbing from different sources.
Unlike most V8 setups, I'll be running a 12A rotary engine.
The water jacket that surrounds the rotors, and has 1/4in holes
to slow down the water. If they plug up, the motor will be toast very quickly.
The rotary also uses an oil cooler, as 1/3 of the cooling is from the oil.
I'm also considering adding an intercooler for the turbo.
What I think all this means is that I need to have pretty clean water
so nothing clogs up. What I think I need is just a simple screen mesh filter,
and was thinking a Y strainer will do the job:
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fimages1.mcmaster.com%2FContents%2Fgfx%2Fsmall%2F43935k23p1s.png%3Fver%3D21972392&hash=9bdc658dedc98bf1a7523efb018ed0dc00a8bc71)
I'm concerned about how fast it will plug up, particularly if I go with a finer mesh, like 20 microns?
And will I get enough flow with such a filter?
It seems I will also want a pressure release valve as well in front of it if it blocks, something cheap and simple
like a water heater safety valve at 150psi, there are others at lower pressure too.
I have a JF pump, so the filter and pressure release can be put outside the hull.
I was even thinking maybe I could create a custom large huge screen filter instead of a tiny one as above to get more flow.
btw, is that a 1/2 NPT thread on the pump water outlet?
I understand the way to keep the flow up and pressure down is to not create any restrictions
in the engine area. This might be hard for the rotary engine as described above. It also uses some simple o-rings
to seal the rotor housings, I suspect these will not tolerate any high pressure water,
so should I consider a pressure bypass? All this sounds like a lot of complicated plumbing. :(
I appreciate any feedback.
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Heat exchanger and antifreeze/coolant will be your friend here.
Dan'l
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Yeah, heat exchanger might be the best approach, can make the jet water without any small openings
so it won't clog, though still need some kind of filter I assume.
It will require a water pump for the engine, the 12a pump is one big heavy cast-iron pump
that I was looking forward to getting rid of. Maybe I can setup an electric one instead?
Don't want to run a belt on the engine.
The plan is to combine the alternator and starter with a brushless motor (no sparks)
direct coupled to the front shaft