Perkins 4107 - Exhaust Heat Exchanger

[billwa]

Hi All.

Can anybody tell me the purpose of having the cooling water circulate through the exhaust manifold.

I am thinking of doing away with the water jacketed manifold for a dry manifold, to increase the efficiency and reduce the complexity of my cooling system (I have a dry stack exhaust) - will this have any adverse effects.

Do 4107/4108 come out with a non-jacketed manifold in any of their incarnations?

[Cheechako]

I'm sure they had an uncooled manifold due to many more of them being made for generators and big water pumps with dry stacks than for Marine use. Boats have the cooled exhaust for fire safety I imagine.... keeping the heat down. ?

[DeepFrz]

Dry stack exhaust. Do you have a keel cooler?

[billwa]

Originally Posted by DeepFrz

Dry stack exhaust. Do you have a keel cooler?

Yes. And currently the exhaust manifold is in the keel cooling circuit.

I am currently installing a rebuilt engine, and am wanting to simplify the plumbing as I do it.

I cannot see the purpose of the water jacketed manifold, given that I have dry stack after it terminates.

I have not had an over heating problem previosly, but have cut the quantity of the coolant in the system as part of the re-install and cooling circuit simplification, and may have to find some more efficiency in the system to offset this. Will not know till I reinstall this donk.

[onestepcsy37]

it has the same purpose as injecting raw water into the exhaust elbow. it's to cool the exhaust gases so they don't melt the rubber hose that serves as the exhaust pipe. if you didn't cool the exhaust gases you would have to have steel exhaust pipes like on a car.

i suppose if you have a dry exhaust with all steel pipe you wouldn't have to cool the exhaust manifold.

[DeepFrz]

You will not have to cool the exhaust manifold, however, it will add a lot of heat to your engine room. You may have to add more ventilation to compensate. It also is a great place to get third degree burns.