Aluminium & Stanless Steel Exhaust manifold & elbow

[ggms16]

Hi Guys, A few days ago the my boat's elbow cracked and poured water to the engine..

I had to change 2 valves and service both cams, thanks God it was all it needed to work perfectly again..

I decided to install these "Stainless Marine" manifolds and elbows to prevent the salt water to destroy them again, I also think it looks better :grin:

I just wanted to share this with you guys and I'd highly recommend this product to anyone in saltwater. There is just one issue, and its that it doesn't come with the ecu base so I had to fit it somehow... You will see it in the picture :huh:

 

[julians]

Can you describe where/how the elbow failed?

Got any pictures of it?

 

[Air O'Nautical]

Looks GREAT!!

I don't see a heat exchanger?
If you are raw water cooled, you will still need to change the manifolds every 5ish years.
The stainless risers should be good forever.
Also, check/change the manifold to risers gasket often.
The iron (manifolds) and stainless (risers) will heat up differently.
This will sometimes cause the gasket in between them to fail.
The old Mercury Blue water 7.4L had stainless risers for a while but, the different metals was a problem with the gaskets sealing.
Cheers,
M

 

[ggms16]

Can you describe where/how the elbow failed?

Got any pictures of it?

The elbow cracked its internal wall. the one that separates water from exhaust..

I'm afraid I don't have pictures of it right now, will try to post them asap..

 

[ggms16]

Looks GREAT!!

I don't see a heat exchanger?
If you are raw water cooled, you will still need to change the manifolds every 5ish years.
The stainless risers should be good forever.
Also, check/change the manifold to risers gasket often.
The iron (manifolds) and stainless (risers) will heat up differently.
This will sometimes cause the gasket in between them to fail.
The old Mercury Blue water 7.4L had stainless risers for a while but, the different metals was a problem with the gaskets sealing.
Cheers,
M

Hi!! :grin:
The new manifolds are aluminium and not iron, they dont even use a gasket between elbow and manifold...
You can see them here: http://www.stainlessmarine.com/inde...mart&page=shop.browse&category_id=37&Itemid=1

Yes my boat is raw water cooled and it lives in saltwater.. Even if it has aluminium manifold do I need to change it every 5 years?

 

[Air O'Nautical]

Hi!! :grin:
The new manifolds are aluminum and not iron, they don't even use a gasket between elbow and manifold...
You can see them here: http://www.stainlessmarine.com/inde...mart&page=shop.browse&category_id=37&Itemid=1

Yes my boat is raw water cooled and it lives in saltwater.. Even if it has aluminum manifold do I need to change it every 5 years?

OK,
Out of my element here.
Aluminum is not good in salt water for long periods.
I am unfamiliar with the product and how it works in salt water.
Stainless Marine has a good name in the go-fast market.

Good luck with them.
M

 

[ggms16]

OK,
Out of my element here.
Aluminum is not good in salt water for long periods.
I am unfamiliar with the product and how it works in salt water.
Stainless Marine has a good name in the go-fast market.

Good luck with them.
M

Aluminium does corrode in saltwater, forming aluminium oxide. Unlike iron oxide, however, aluminium oxide sticks very firmly to the surface of the metal, preventing further attack while being resistant to corrosion itself. Iron oxyde, in the other hand, flakes off, exposing more iron underneath for it to be attacked.

This makes aluminium more resistant to saltwater than iron..

 

[ggms16]

I'm posting some pics of the manifold so you can see the elbow apart.