Water cooling 202

Postby damoid » Sat Feb 25, 2017 8:38 am

Is it absolutely necessary to run cooling water through the sump before entering the manifold...
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Re: Water cooling 202

Postby nevergrew » Sat Feb 25, 2017 12:49 pm

No


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Re: Water cooling 202

Postby damoid » Sat Feb 25, 2017 2:10 pm

Thanks mate
What are your thoughts on stepping up to a 3/4 " water pump over the standard 1/2"
I realise fitting it will be tricky
Do you feel it's a bit of overkill
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Re: Water cooling 202

Postby 82Juddcraft » Sat Feb 25, 2017 7:46 pm

What's the reason not running it though the sump?
Ideally u want even cooling through the block.
I know running river water through a boat engine has worked for year but I cringe at running 25 degree water through a hot block... surely can't be good. But hey it works :-)
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Re: Water cooling 202

Postby damoid » Sun Feb 26, 2017 10:18 am

Thanks 82Juddcraft
I guess I'm a little reluctant to run the cooling water through the sump for fear of a catastrophic failure down there.There is definitely an element of naivety on my part as I'm not entirely sure if the water is piped through the sump in order to cool the oil or to warm the water.
Also when I took the boat for a run prior to purchasing it we went 500 meters and the temperature went straight up to 100 degrees,so post complete rebuild of the engine I am erring on the side of safety,but after a lot of research I'm a aware that running the engine to cool can be equally as damaging.
Also I want to keep things as simple and neat as possible under the hatch.
I guess it's a matter of trial and error here I just don't want to be making to many errors.
Any thoughts or advice would be greatly appreciated...
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Re: Water cooling 202

Postby mof » Mon Feb 27, 2017 9:59 am

Water thru the sump is a crude oil cooler. Oil shouldn't be cooled till it is hot, i.e. thermostatically controlled cooler. Oil not getting properly hot is as bad as oil getting too hot.

Basic raw water cooling set-ups will often pre-heat the water thru the exhaust manifold before delivering it to the block. Unless it is a priority system with water pump on the block.
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Re: Water cooling 202

Postby 82Juddcraft » Mon Feb 27, 2017 11:48 am

damoid wrote:Thanks 82Juddcraft
I guess I'm a little reluctant to run the cooling water through the sump for fear of a catastrophic failure down there.There is definitely an element of naivety on my part as I'm not entirely sure if the water is piped through the sump in order to cool the oil or to warm the water.
Also when I took the boat for a run prior to purchasing it we went 500 meters and the temperature went straight up to 100 degrees,so post complete rebuild of the engine I am erring on the side of safety,but after a lot of research I'm a aware that running the engine to cool can be equally as damaging.
Also I want to keep things as simple and neat as possible under the hatch.
I guess it's a matter of trial and error here I just don't want to be making to many errors.
Any thoughts or advice would be greatly appreciated...

It's to cool the oil, then the oil cools the engine.

I'm only spit balling ideas here, I'm not sure on where the water jackets are in a 202 but if they were a design flaw and they may have need extra cooling, so they put coils in the sump as a heat exchange.

I have seen heat exchanges fatigue through vibration and the tubes crack letting water into the oil.
I'd definitely run a temp gun over the whole engine with a skier on the back.
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Re: Water cooling 202

Postby nevergrew » Mon Feb 27, 2017 9:37 pm

As mentioned, it's to cool the oil. Compared to an automotive setup, marine engines are notorious for running cooler, so an oil cooler always baffled me.




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Re: Water cooling 202

Postby nevergrew » Mon Feb 27, 2017 9:49 pm

[IMG]https://uploads.tapatalk-cdn.com/20170227/e8dcbf221a7293f3456b6753ffd70b9e.jpg[/IMG]

Because we skied all your round, I had a restriction tap to slow the flow through the block before exiting into the exhaust. Then summer time I'd open it right up.


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Re: Water cooling 202

Postby damoid » Fri Apr 21, 2017 3:02 pm

Di I need to run an ignition relay if I'm using a 50 amp on off switch and 50 amp push start switch with ten gauge wire on a Holden 202.?
Just trying to simplify the wiring
Any advice greatly appreciated
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Re: Water cooling 202

Postby 82Juddcraft » Fri Apr 21, 2017 7:13 pm

What's wrong with using a normal ignition?

To answer your question if all the contacts are rated u should be fine.
Good thing about a relay tho is less voltage drop because it's not having to travel up to the dash and back.
Good practice is u switches to do the controlling and the relays and contactors to do all the heavy lifting.
I used 8mm wire for my start solenoid.

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