On Tue, 23 Mar 2010 19:15:38 -0400, bpuharic wrote:

looking to replace exhaust hose...one section has wire reinforcement,
another hose on other manifold does not.

any thoughts? this stuff isn't under much pressure and i think wire
can create local hotspots, leading to the wire tearing loose from the
hose over time....

engine is 350 merc on a 27' tollycraft

Hose is rarely attached directly to a manifold - it would get too hot
and quickly burn up. Most often it is attached to something called a
"riser" or "elbow" which is the point where raw cooling water is
injected into the exhaust flow.

All of the exhaust hose that I'm familiar with is wire reinforced. It
prevents the hose from collapsing when it is bent into a radius. I
guess it's possible that if you had a totally straight run you could
get by without the reinforcement but I'd talk with an expert before
doing that.

On Tue, 23 Mar 2010 19:39:55 -0400, Wayne.B
wrote:

On Tue, 23 Mar 2010 19:15:38 -0400, bpuharic wrote:

looking to replace exhaust hose...one section has wire reinforcement,
another hose on other manifold does not.

any thoughts? this stuff isn't under much pressure and i think wire
can create local hotspots, leading to the wire tearing loose from the
hose over time....

engine is 350 merc on a 27' tollycraft

Hose is rarely attached directly to a manifold - it would get too hot
and quickly burn up. Most often it is attached to something called a
"riser" or "elbow" which is the point where raw cooling water is
injected into the exhaust flow.

yep, the old stuff is connected to the risers..

All of the exhaust hose that I'm familiar with is wire reinforced. It
prevents the hose from collapsing when it is bent into a radius. I
guess it's possible that if you had a totally straight run you could
get by without the reinforcement but I'd talk with an expert before
doing that.

these are pretty straight runs, but there's no guarantee, i think
that, as the hose ages, it couldn't buckle under use...

On Mar 23, 5:45*pm, bpuharic wrote:
On Tue, 23 Mar 2010 19:39:55 -0400, Wayne.B





wrote:
On Tue, 23 Mar 2010 19:15:38 -0400, bpuharic wrote:

looking to replace exhaust hose...one section has wire reinforcement,
another hose on other manifold does not.

any thoughts? this stuff isn't under much pressure and i think wire
can create local hotspots, leading to the wire tearing loose from the
hose over time....

engine is 350 merc on a 27' tollycraft

Hose is rarely attached directly to a manifold - it would get too hot
and quickly burn up. *Most often it is attached to something called a
"riser" or "elbow" which is the point where raw cooling water is
injected into the exhaust flow. *

yep, the old stuff is connected to the risers..



All of the exhaust hose that I'm familiar with is wire reinforced. *It
prevents the hose from collapsing when it is bent into a radius. *I
guess it's possible that if you had a totally straight run you could
get by without the reinforcement but I'd talk with an expert before
doing that.

these are pretty straight runs, but there's no guarantee, i think
that, as the hose ages, it couldn't buckle under use...- Hide quoted text -

- Show quoted text -

Well, consider the heater hoses n a car. Even in an enclosed system
like a car, there is usually a nylon webbing embedded inside the hose
and not steel mesh. Now on a radiator hose, especialy on the top hose
there is usualy a large "spring" fitting on the inside, to keep the
hose from collapsing and still make the hose pliable for shaping but
rigid enough to keep it from collapsing on cool down. then again we're
laking abotu nclosed systems on cars that run 190 degrees too.


Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

On Mar 23, 6:54*pm, bpuharic wrote:
On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. *even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). *the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

Woah!. OK, thats for some interesting stuff!

"Tim" wrote in message
...

On Mar 23, 6:54 pm, bpuharic wrote:
On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

Woah!. OK, thats for some interesting stuff!

Sounds like the type that was on the last boat I had and had to replace.
Big honking hoses.
The engines were the MercCruiser (GM) 454ci and the hoses that ran from the
risers to the
mufflers were either 4" or 6" diameter. (can't remember). The boat yard
where I bought the
boat located and installed them. I never liked that boat. Sold it. Now
boatless. Miss the Navigator.

Eisboch

On 3/23/10 9:18 PM, Eisboch wrote:


Sounds like the type that was on the last boat I had and had to replace.
Big honking hoses.
The engines were the MercCruiser (GM) 454ci and the hoses that ran from the
risers to the
mufflers were either 4" or 6" diameter. (can't remember). The boat yard
where I bought the
boat located and installed them. I never liked that boat. Sold it. Now
boatless. Miss the Navigator.

Eisboch



Considering your previous taste in boats, I never could figure out why
you bought that last boat. I would have kept the little GB if it were in
good shape, since it seemed well-found and also satisfied your need for
creature comforts when "bach'ing" it.

There were a few American Tugs or whatever that other brand is for sale
at a local boatyard. Looked lightly used. You ever look 'em over?

On Tue, 23 Mar 2010 21:18:49 -0400, "Eisboch" wrote:


"Tim" wrote in message
...

On Mar 23, 6:54 pm, bpuharic wrote:
On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

Woah!. OK, thats for some interesting stuff!

Sounds like the type that was on the last boat I had and had to replace.
Big honking hoses.
The engines were the MercCruiser (GM) 454ci and the hoses that ran from the
risers to the
mufflers were either 4" or 6" diameter. (can't remember). The boat yard
where I bought the
boat located and installed them. I never liked that boat. Sold it. Now
boatless. Miss the Navigator.

Eisboch


i didn't want to pull the hoses off the risers when i visited the boat
on saturday...so i measured the circumference.

calculated 3.88" diameter. from this i assume the ID was 3.5" with
about a 0.2" thick wall.

On Mar 23, 7:54*pm, bpuharic wrote:
On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. *even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). *the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

my 27' Chris Craft had aluminum piping going down from the manifolds
and elbowing toward the back. The hoses were short, and about 4-41/2 "
in diameter from what I remember, and bulbous in the middle that
connected the elbow to the actual exhaust pipe that went to the
transom ports. I take it they were shaped that way for flexibility.

You couldn't 90 degree them, but you did have some grace.

On Tue, 23 Mar 2010 19:05:01 -0700 (PDT), Tim
wrote:

On Mar 23, 7:54*pm, bpuharic wrote:
On Tue, 23 Mar 2010 17:41:47 -0700 (PDT), Tim
wrote:



Bob, if you're running a raw water system I think I'd just the simple
stuff with the nylon mesh inside. My hoses on my 350 GM are common
from NAPA. *even the ones that carry the water to the manifold risers.
Now from the manifolds to the outdrive or exhaust ports in the hull,
that might be a different issue that I have no knowledge of.

this is actually an inboard (surprising for a 27' boat, but it has a V
drive). *the marina guy said i could probably get what i need at the
autoparts store, but i don't think they're actually any cheaper.

these hoses go from the risers to the muffler, then to the exhaust
ports.

my 27' Chris Craft had aluminum piping going down from the manifolds
and elbowing toward the back. The hoses were short, and about 4-41/2 "
in diameter from what I remember, and bulbous in the middle that
connected the elbow to the actual exhaust pipe that went to the
transom ports. I take it they were shaped that way for flexibility.

You couldn't 90 degree them, but you did have some grace.

i thought about aluminum but am worried about the effect of hot
sal****er....also thought about stainless steel which may be cheaper
than the $1.50/ft the yard wants for hose. but have to worry about
heat dissipation from the steel into the engine compartment