Trying to decide whether to replace my stock exhaust with aftermarket or Mercury.Had a riser go bad at the end of the season just replace the riser to make sure no damage was done.And ran the boat for the rest of the season.I am hopefully only going to have this boat one more season so don't want to go crazy with mods.Most aftermarket don't use as many hoses to the risers and manifolds so what do I do with all this crap.?
http://www.mercruiserparts.com/Show_...Cooling+System
Thread: Exhaust question
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12-01-2009 12:03 AM
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12-01-2009 12:45 AMIf the leak is fixed now ,,,just leave it !?
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12-01-2009 09:31 AMRisers are 3 to 5 year service items.. IMO the gasket should be changed and risers cleaned and inspected every other season.
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12-01-2009 11:10 AM
Stay with stock if you plan to peddle it.
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12-01-2009 03:52 PMTim, I gotta admit....the mercury engineer had a field day and must have been paid overtime designing the water system on that engine with all the extra hoses and one/way valves and quick disconnects etc... Theoretically it's great because it makes draining down the engine nice and easy but long-term I think it may cause a lot of problems when the hoses get clogged from sand/rust.
To get your system to work with an aftermarket unit I believe you will need to "t" hose #5 with 22 and #6 with 23 and possibly cap/off or elinimate hose #3. Anyone else?
The two sets of hoses that come off the t-stat housing is for the poppet valves which bleed off water when the t-stat is closed and the regular water outlet when the t-stat is open.
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12-01-2009 04:31 PM
I have a nearly identical setup on my Donzi (6.2's as well) When I do mine I'm going with GLM Aluminum. I did my last Donzi small block with EMI thunder and it was a total PITA.
With the GLM setup it will be bolt on and go. If you go another route you will have fitment issues with the exhaust tips. You'll also have the total and complete headache of hoses, brackets, and every other freaking problem for minimal (if any) performance gain over the GLM aluminum setup.
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12-01-2009 05:35 PM
Stainless Marine. And it will be a good selling point for any perspective buyers. What are ya getting next Tim?
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12-01-2009 07:59 PM
35 ,38 Fountain would do the 35 now but the slip that I rent which has my lift in won't fit anything bigger than my boat.If I can't move to a bigger slip after next year I am pulling my lift out might do it sooner.There are to many deals out there and if I wait another year I should be able to get what I really want.38 staggered.
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12-02-2009 11:48 PM
You could try and find some 496HO take offs. Check Recycle Performance or Teague. The smaller water exit hoses on the T Stat housing can be T'd together. That is what Merc did with Gil exhaust.
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