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Originally Posted by Plaineman
(Post 2577424)
Thanks for all guys.... Strip, that motor was really bad man... I thought I had it bad but I realize a lot of people have a similar problem. I am probably in for a similar problem with these head bolts.... YIKES!!!
Hey Mobil, I did not see any pics of stainless steal risers but gotta ask... Eddie Marine is trying to sell me a performance upgrade with a set of cast aluminum manifolds with stainless risers... supposedly adds like 30 horse or something. They say it is safe and should last longer than stock... is this not true? Chris, I have been looking and I am finding some cheap heads for this engine and may just try that... and the salt nuetralizer??? Will I find this at the local marine supply? I will give it a shot... thanks. Looks like I will be keeping dry for a while... sux but gotta do what we gotta do. Thanks.... B |
Originally Posted by Strip Poker 388
(Post 2577838)
Im missing something? the engine in the thread was a 415mpi 1996 stock exhaust.
The problem with stainless and stock cast iron is the gasket is in a hopeless battle dealing with corrosion problems from dissimilar metals. different expansion rates, and narrow surfaces separating water and exhaust. All the aluminum manifolds I have seen pass water around the gasket surface not thru it and don't have a water weep problem. |
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Originally Posted by MOBILEMERCMAN
(Post 2577932)
Yes the risers in that pic was of a stainless risers. There are still a bunch in service. and still leaking in to the motors. Merc stopped using them thankfully.
The problem with stainless and stock cast iron is the gasket is in a hopeless battle dealing with corrosion problems from dissimilar metals. different expansion rates, and narrow surfaces separating water and exhaust. All the aluminum manifolds I have seen pass water around the gasket surface not thru it and don't have a water weep problem. |
Gotta admit I am missing something too... I did not see any stainless risers in those pics... maybe Mobil knows something we dont but they look stock to me. All of the stainless risers that I have seen are very distinct looking and in fact I argued with a guy trying to sell them to me that they would not fit in my boat... turns out they line right up to the stock 4" hose that goes to my captains choice exaust.
Anyway... I always knew this wasn't a poorman's hobby. If it were up to me I would be taking all the doe and putting down on the new 382 I want with the twin 700's. That one aughta be fun once chit starts to go south huh? Maybe next year... Thanks again guys... really appreciate the help. Brian |
Originally Posted by MOBILEMERCMAN
(Post 2577932)
Yes the risers in that pic was of a stainless risers. There are still a bunch in service. and still leaking in to the motors. Merc stopped using them thankfully.
The problem with stainless and stock cast iron is the gasket is in a hopeless battle dealing with corrosion problems from dissimilar metals. different expansion rates, and narrow surfaces separating water and exhaust. All the aluminum manifolds I have seen pass water around the gasket surface not thru it and don't have a water weep problem. |
Originally Posted by Plaineman
(Post 2577973)
So does this mean I should be good with aluminum manifolds and stainless risers??? That's what Eddie Marine is trying to sell me... supposed to work well but I may not be willing to try them on these heads.
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Thanks Strip...
After a bunch of thinking on it today and some number crunching I have come to the conclusion that it is just time to repower this thing... I am looking at a nice 502 mag HO ready to go... a few tweaks here and there and she should be good as new. Probably not going to happen until next season but in the mean time I am going to find a cheap set of manifolds and see if I cant get a few more hours out of her this summer. It will be fun to do the repower when the time comes though... thanks for the great post on the job you did on your friends boat... it helped a lot. Peace. Brian |
Start a thread in the wanted section Ive seen some guys just give them manifolds, or atleast 200. but the freight will be close to the same:D
http://www.offshoreonly.com/forums/s...archid=2027144 |
Thanks man... I'm on it
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Originally Posted by Plaineman
(Post 2579457)
Thanks man... I'm on it
I am thinking even if you took the heads off, they machined down the gasket surface,nope. But if ya try it get a gasket that has the metal in it, like a Felpro and get some Black high temp, maybe it will fill in the holes when ya put it together,Goodluck:ernaehrung004: |
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