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Camalot

04-19-2018 04:19 PM

Headers using closed loop to cool

Ok this may seem a little odd and would need to modify the headers, I see a lot of aftermarket closed loop cooling systems fitted to marine engines. Some are just engine cooling and some are engine and manifolds cooling with the riser raw water cooled. I've been looking at upgrade manifolds and headers of late and just thought why could you not cool the headers with the closed loop cooling.
I do realize that some modifications would be needed to the headers to stop coolant from exiting the rear but can anyone see a real reason why this would not work as long as the heat exchanger is large enough.

snapmorgan

04-19-2018 04:44 PM

It has been done.

Bondo

04-19-2018 04:58 PM

Quote:

I see a lot of aftermarket closed loop cooling systems fitted to marine engines. Some are just engine cooling and some are engine and manifolds cooling with the riser raw water cooled.

Ayuh,..... Is yer motor currently a closed coolin' system,..??

If so, are the manifolds included in the system,..??

If Not,.... Addin' it to a used motor, usually ends in disaster, with a clogged unrepairable exchanger,....

Camalot

04-19-2018 05:30 PM

Quote:

Originally Posted by Bondo (Post 4622366)

Yeah it's a new engine going in so no problem there thanks.

Camalot

04-19-2018 05:32 PM

Quote:

Originally Posted by snapmorgan (Post 4622360)

It has been done.

I thought it lwould have been do thanks

sutphen 30

04-19-2018 06:36 PM

you need a much larger cooler than stock.what exhaust manifolds do you have,,cast iron or aluminum?

Camalot

04-19-2018 07:15 PM

Quote:

Originally Posted by sutphen 30 (Post 4622384)

you need a much larger cooler than stock.what exhaust manifolds do you have,,cast iron or aluminum?

As it's a new engine going in I won't be using the old stock manifolds, I guess I'm lucky being a Volvo Penta technician and rebuilding a lot of our Canadian government water crafts I have a load of 41 series heat exchanger To Hand which are more than big enough for the job.

I was hoping to hear from someone that has done it.

Griff

04-20-2018 01:40 AM

I guess my question would be why do it??
I only see an advantage if it used primarily in salt water.

Camalot

04-20-2018 04:40 AM

Only real reason is I have a chance to get a set of new fresh water Lighting headers as a trade for some work to a boat. I use the docks at work which is salt water also lake usage which is a little brackish. Thanks for the replies

sutphen 30

04-21-2018 08:40 AM

Quote:

Originally Posted by Camalot (Post 4622388)

I was hoping to hear from someone that has done it.

I have done it,,thats why I said you'll need a bigger than normal exchanger and even then you'll need the water flow to keep it from boiling over under a heavy load.good luck,watch your gauges.

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