Exhaust manifold water rail
#2
Charter Member #737
Charter Member
Re: Exhaust manifold water rail
Do you mean like on headers? If so to cool them.
Last edited by KCHOTBOAT; 08-25-2005 at 09:09 AM.
#3
Registered
Join Date: Jun 2001
Location: Lehigh Valley, Pennsylvania
Posts: 1,567
Likes: 0
Received 0 Likes
on
0 Posts
Re: Exhaust manifold water rail
Standard black merc manifolds have all the exhaust ports and water ports all globbed into one big mass of cast metal. Note the black hoses that connect to each manifold, they carry the water. The performance motors have headers which are not all encased, thus exposed and viewed as exhaust pipes along with the water rail as you call it. In either case, you have both exhaust and water exiting the motor. Now there are mass HP setups which may differ from this, but this will cover most boat engines out there.
#4
Registered
Thread Starter
Join Date: Feb 2002
Location: Dubuque, IA
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Re: Exhaust manifold water rail
I’m talking about in particular, the 496HO. My 496HO exhaust manifolds have water rails. My understanding is they come with or without water rails.
-Craig
-Craig
#5
Registered
Re: Exhaust manifold water rail
I think that they were supposed to help the manifold cool evenly, but not sure. They phased them out pretty quick due to leakage problems.
Dave
Dave
#6
Registered
Re: Exhaust manifold water rail
My 496 also had the rails you are talking about though they are not as obvious as the ones on the CMIs I just put on. I am not sure about the problems that Dave referred to as I have not had any trouble with mine with 250 hrs on it.
#7
Registered
Thread Starter
Join Date: Feb 2002
Location: Dubuque, IA
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Re: Exhaust manifold water rail
Originally Posted by boatfreak28
My 496 also had the rails you are talking about though they are not as obvious as the ones on the CMIs I just put on. I am not sure about the problems that Dave referred to as I have not had any trouble with mine with 250 hrs on it.
Thread
Thread Starter
Forum
Replies
Last Post
Rage
General Q & A
41
02-18-2007 09:42 PM