Engine cooling thermostat, how does it work

[petem]

See? You can't say anymore that I don't consider your problem, P! :encouragement:

Thanks P! However, our marina is built onto reclaimed land at the foot of some hills and I suspect the water supply comes down the hill and is therefore ridiculously high pressure. So much so that it keeps popping fixings off and the hose dances around like a demented snake soaking everyone.

 

[jfm]

Nope, actually I wasn't aware of the expression, but I see what you mean, of course.
I'm not feeling much guilty, though: when compared to rinsing a whole boat, the total amount of water required for flushing the engines is almost negligible.
But for those few minutes, the flow has to be adequate, to avoid starving the impeller.

Apropos, just in case anyone is still skeptic about this, I also made a short video.
In fact, I understand that feeding the raw water circuit of a biggish engine with just a hose (albeit a bit larger than the usual ones), when the normal intake is from a 3" seacock, can intuitively appear not good enough.
But obviously, the seacock size has to cope with the max rpm, while flushing is done at idle, and this makes a huge difference!

In fact, the video shows a MAN V8 idling at 650rpm or so, with the seacock completely closed.
And as can be seen, the strainer remains always full, even if filled only by the dock hose.
The water inside looks a bit "turbulent", due to the way the hose is connected to the lid, creating a somewhat hectic water movement inside.
But in terms of flow, it's crystal clear that the engine impeller never demands more water than the hose can supply - Q.E.D. :encouragement:

PS: before anyone asks, I think that the metallic (sort of) noise in the background can only be due to distortion introduced by the smartphone mic, which maybe struggles in a noisy environment.
Anyhow, it's totally absent in flesh, thanks God!

Yup I was only pulling your leg on the land grab thing
Mine look exactly the same as yours in your video, at slow idle 550rpm (I have 2 dashboard-switchable idle speeds, 550 and 650). The BFTM works well :encouragement:

 

[Lon nan Gruagach]

I was wondering about this BodgeFlow^TM thing... could it work for:

 

[LittleSister]

I was wondering about this BodgeFlow^TM thing... could it work for:

You'd need quite a long hose!

 

[MapisM]

I was wondering about this BodgeFlow^TM thing... could it work for:

I can't think of any reason why the BF shouldn't work for engines/gensets of any size - provided of course to have a large enough fresh water supply.
But it's the type of usage of commercial vessels (24/7, or almost) that makes the BF totally pointless.
It only makes sense with boats which stay unused for long(ish) periods of time, which is exactly what happens with pleasure boats.
Also with my boat, I don't bother flushing anything when she's used regularly, as it happens during the summer (and usually towards the end of the spring and beginning of autumn)...