Risers

[mthieme]

Anyone ever run across or heard of cast stainless steel Mercuiser risers?

 

[bomar76]

Re: Risers

Yes.

 

[jerryjerry05]

Re: Risers

They are expensive and used in a lot of high performance motors.You can use them on a regullar motor too.Jerry

 

[mthieme]

Re: Risers

Thanks guys.

I didn't believe they were stainless.

 

[achris]

Re: Risers

I had a pair on my old V6. They'll outlast the engine, as long as you don't run them dry.

Mec ran them for a few years and then stopped making them. The story I was told was that they were replacing so many under warranty (because people were running them dry!) that it was un-economical for them. Shame really, they solve the problem of having to replace elbows every few years...

Chris...........

 

[TilliamWe]

Re: Risers

My 1997 5.7LX EFI Gen + engine has them on it. Standard, from the factory.

Part #s 816900A 5 and 816900A 9. Mercruiser list price of $609.98/ea.

 

[lmannyr]

Re: Risers

Why would one run dry? Thats just asking for a water impellar change. Unless your talking about dry exhaust. BTW, what exactly happens when you run them dry?

 

[Don S]

Re: Risers

SS and cast iron expand and contract at different rates. During an oveheat, the gasket between the SS riser and the Cast Iron manifold fails and you get water in the cylinders when you shut the engine off.
In salt water, that is a recipt for disaster if the water sets in the cylinders for a couple of days.

 

[mthieme]

Re: Risers

Would it be normal for SS risers to have a thin film of rust around the hose connections and inside the jackets if used in brackish waters? The fittings, especially the little hose fitting are all as meaty as new though. How could one definitely tell them apart from low hour cast iron??

 

[Don S]

Re: Risers

Would it be normal for SS risers to have a thin film of rust around the hose connections and inside the jackets if used in brackish waters?

Yes, some discoloring is normal. Like they always told me, it stainless, not stainproof

How could one definitely tell them apart from low hour cast iron??

SS is non magnetic.

 

[mthieme]

Re: Risers

Perfect. I wasn't sure about the magnetic thing.
thanks - exactly what I needed.