Outboard popularity question.
 

"Wayne.B" wrote in message
...
On Mon, 8 Oct 2007 20:39:05 -0700, "Calif Bill"
wrote:

On the freshwater, there is a plate blocking off the
risers and the raw water cools them. So just the risers have to be
replaced. Mine are aluminum, and the last ones lasted 14 years.

I assume that is in fresh water, not salt?


I run both. Living near San Francisco Bay, I fish lakes, rivers, bay and
ocean. Last engine lasted about 1450 hours. Was just a wore out 351w after
that time.

Outboard popularity question.
 

On Mon, 08 Oct 2007 22:05:17 -0500, lid wrote:

John H

On Sun, 7 Oct 2007 23:35:23 -0700, "Calif Bill"
wrote:


"John H." wrote in message
...
On Sat, 06 Oct 2007 20:35:42 -0700, Tim wrote:

On Oct 4, 10:22 am, Wayne.B wrote:
On Thu, 04 Oct 2007 08:17:57 -0400, HK wrote:
To me, the real downside of an I/O is the drive and the drive's big
rubber boot. The drive, because it adds complexity, and the boot
because, well, use your imagination.

We have a lot of I/Os in our area of SW Florida, including about 80%
of my neighbors. Interestingly enough you don't hear about many boot
problems although one neighbor did succeed in ripping the I/O clean
off the transom creating a boot failure of sorts. :-)

Cooling issues, manifolds and risers are near the top of the list
based on what I've observed.


I was going to say,t hat if I had an I/O on salt, I'd want an enclosed
cooling system, but still pull the boat after every use, and flush the
lower end with fresh water.



I googled marine cooling and this is one of my responses:

http://tinyurl.com/cqhmu

Some good info on cooling systems he

http://tinyurl.com/yozrfc

I wish I'd known about the fresh water systems when I bought the boat. I
don't know why they aren't the standard, although they may be the standard
now. I wonder how much more difficult changing the oil filter becomes with
all that extra piping and the exchanger mounted over the engine?

My heat exchanger is on top of the motor, just inside the port riser.
Changing the oil filter is no more problem than a raw water cooled motor.
Major reason that freshwater cooling is not standard, is it adds about $1000
to the cost of the motor. The Exchanger itself is about $6-700.


Looking back now, I'd gladly pay the extra $1000 if the benefits are as
described. New manifolds and risers run about $6-700 also.

I sure someone will correct me if I'm wrong but, IIRC, the fresh water
cools only the engine. Salt water is still used to cool the fresh
water (in the heat exchanger). It is pumped in from the sea with the
standard water pump in the lower unit and returns to the sea by way of
the exhaust manifold(s), just like standard cooling. So if you're
thinking you'd be saving the manifolds from seawater's rust and
corrosion, you'd be wrong (if I'm right in my recollection).

Rick

Based on your's and the other comments, I'm glad I've gone the outboard
route.

Outboard popularity question.
 

On Oct 8, 11:55 pm, Wayne.B wrote:
On Mon, 08 Oct 2007 22:05:17 -0500, wrote:
Looking back now, I'd gladly pay the extra $1000 if the benefits are as
described. New manifolds and risers run about $6-700 also.

I sure someone will correct me if I'm wrong but, IIRC, the fresh water
cools only the engine. Salt water is still used to cool the fresh
water (in the heat exchanger). It is pumped in from the sea with the
standard water pump in the lower unit and returns to the sea by way of
the exhaust manifold(s), just like standard cooling. So if you're
thinking you'd be saving the manifolds from seawater's rust and
corrosion, you'd be wrong (if I'm right in my recollection).

It depends. Some FWC systems cool the manifolds with coolant, others
with raw water. The risers/elbows still see raw water regardless.
Obviously if the manifolds are still being cooled with raw water their
life expectancy will not be increased by FWC, only the block and
heads.

That's why they don't really save that much. The risers are the part
that goes first with raw water cooling and no closed system includes
those. The only thing you save with a closed system is the exhaust
manifolds. You can cool a marinized auto engine with salt water
forever without any major effects. Salt water is not going to damage
a block. There are engines out their in fishing boats that have been
in them 20 years using salt water to cool the block. And closed
systems are not without their own problems with the exchangers and all
the additional plumbing.

Outboard popularity question.
 

"jamesgangnc" wrote in message
ups.com...
On Oct 8, 11:55 pm, Wayne.B wrote:
On Mon, 08 Oct 2007 22:05:17 -0500, wrote:
Looking back now, I'd gladly pay the extra $1000 if the benefits are as
described. New manifolds and risers run about $6-700 also.

I sure someone will correct me if I'm wrong but, IIRC, the fresh water
cools only the engine. Salt water is still used to cool the fresh
water (in the heat exchanger). It is pumped in from the sea with the
standard water pump in the lower unit and returns to the sea by way of
the exhaust manifold(s), just like standard cooling. So if you're
thinking you'd be saving the manifolds from seawater's rust and
corrosion, you'd be wrong (if I'm right in my recollection).

It depends. Some FWC systems cool the manifolds with coolant, others
with raw water. The risers/elbows still see raw water regardless.
Obviously if the manifolds are still being cooled with raw water their
life expectancy will not be increased by FWC, only the block and
heads.

That's why they don't really save that much. The risers are the part
that goes first with raw water cooling and no closed system includes
those. The only thing you save with a closed system is the exhaust
manifolds. You can cool a marinized auto engine with salt water
forever without any major effects. Salt water is not going to damage
a block. There are engines out their in fishing boats that have been
in them 20 years using salt water to cool the block. And closed
systems are not without their own problems with the exchangers and all
the additional plumbing.


The advantage of the fresh water cooling is besides not worrying about
freeze damage, the engine can run at a better temperature. More efficient.