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31-10-2011, 05:48
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#1
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Registered User
Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
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Exhaust: Ball Valve
I have heard of people putting Ball Valve to avoid water entering the exhaust piping
Any one can inform me about it: What is it? where to install it and how? prices?
Thank you
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
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31-10-2011, 07:21
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#2
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,137
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Re: Exhaust: "Ball Valve"
As far as I know, the only system using a seacock, is in a "Dewatered" exhaust system ; which is wet exhaust system, in which the water and exhaust gases are subsequently separated, and discharged through individual outlets.
See Figures 6a & 6b, here
➥ http://www.marinesurveyorschool.org/...%20Systems.pdf
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Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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31-10-2011, 07:53
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#3
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CF Adviser Moderator Emeritus
Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,942
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Re: Exhaust: "Ball Valve"
I put one of these on the exhaust outlet. I could hear it flapping shut when a swell ran up on us, sailing off the wind. I don't think I'd want a ball valve in the exhaust line--just my personal opinion.
SIERRA Exhaust Flapper Valves at West Marine
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__________________
Hud
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31-10-2011, 08:00
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#4
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Registered User
Join Date: Aug 2006
Location: Cruising
Boat: Custom Ketch Asperida
Posts: 230
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Alecadi
I have heard of people putting Ball Valve to avoid water entering the exhaust piping
Any one can inform me about it: What is it? where to install it and how? prices?
Thank you
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I think , Alecadi is asking about a valve to protect the engine from the possible reverse flow of water when it is not running -when you sail.
T.
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31-10-2011, 08:06
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#5
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CF Adviser Moderator Emeritus
Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,942
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Re: Exhaust: "Ball Valve"
The flapper does that, brilliantly!
And cheaply!!!
__________________
Hud
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31-10-2011, 08:07
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#6
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Registered User
Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Tristan
I think , Alecadi is asking about a valve to protect the engine from the possible reverse flow of water when it is not running -when you sail.
T.
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My concern is overflowing the engine with water when MOTORING with seas coming aft.
Sorry if my question was not clear enough.
Alec
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
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31-10-2011, 08:10
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#7
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CF Adviser Moderator Emeritus
Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,942
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Re: Exhaust: "Ball Valve"
If you're motoring the exhaust pressure will keep the water from coming in. It's when sailing with following seas that you have to worry about it.
__________________
Hud
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31-10-2011, 08:16
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#8
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Registered User
Join Date: Oct 2007
Location: Urbanna, Virginia
Boat: Tartan 4100
Posts: 697
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Re: Exhaust: "Ball Valve"
If you are motoring, you cannot have the valve shut, so I am not sure the reasoning While motoring. Certainly, when you are sailing, having the flapper (as shown) would work to keep the water from pushing it's way back to the engine. I have heard the some people use a ball valve for this, but I would think it would be a pain to constantly rememeber to open/shut it, especially if it is difficult to reach.
The exhaust hosing should loop well above the waterline after the muffler to help prevent back flow.
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31-10-2011, 08:19
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#9
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Registered User
Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Hud3
If you're motoring the exhaust pressure will keep the water from coming in. It's when sailing with following seas that you have to worry about it.
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Hud I respect opinions of more experienced sailor as yourself, but I've read so many time about people loosing engine when motoring with following seas..
I'm quite confused now..
On the other hand I think the flap valve should be a good solution.
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
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31-10-2011, 08:22
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#10
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Registered User
Join Date: May 2009
Posts: 1,379
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Alecadi
Hud I respect opinions of more experienced sailor as yourself, but I've read so many time about people loosing engine when motoring with following seas..
I'm quite confused now..
On the other hand I think the flap valve should be a good solution.
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Can you dig up a few of those accounts for us to look at? I would be shocked if anything had the force to back water up into a running motor.
Most of the accounts of problems with water getting into the motor that I've read have come from the lack of a proper anti siphon in the exhaust-water injection and perhaps very rough conditions in which the boat would hobby horse severely enough that water could make its way into a cylinder despite that.
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Let your heart tell you where to go, but let your brain tell you how to get there.
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31-10-2011, 08:45
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#11
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Registered User
Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Target9000
Can you dig up a few of those accounts for us to look at? I would be shocked if anything had the force to back water up into a running motor.
Most of the accounts of problems with water getting into the motor that I've read have come from the lack of a proper anti siphon in the exhaust-water injection and perhaps very rough conditions in which the boat would hobby horse severely enough that water could make its way into a cylinder despite that.
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Sorry I didn't keep track and probably I misunderstood, thinking that the engine was on in the case I've read.
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
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31-10-2011, 08:52
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#12
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Registered User
Join Date: May 2009
Posts: 1,379
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Alecadi
Sorry I didn't keep track and probably I misunderstood, thinking that the engine was on in the case I've read.
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No worries. We all misunderstand or misread stuff sometimes.
It is still a good question though. Should you have a valve in the exhaust that can be closed while sailing without the motor running? I've hear advice both ways.
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Let your heart tell you where to go, but let your brain tell you how to get there.
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31-10-2011, 08:54
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#13
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Registered User
Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
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Re: Exhaust: "Ball Valve"
Quote:
Originally Posted by Target9000
No worries. We all misunderstand or misread stuff sometimes.
It is still a good question though. Should you have a valve in the exhaust that can be closed while sailing without the motor running? I've hear advice both ways.
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I think that the flapper solution is quite interesting.. and cheap...
Anybody has experience with this?
I confess I've never seen a sailboat with one so far (or I don't look at the exhaust of other boats )
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
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31-10-2011, 08:59
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#14
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CF Adviser Moderator Emeritus
Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,942
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Re: Exhaust: "Ball Valve"
Alecadi,
The only thing I can come up with that's "motoring" related is the potential for cooling water to get into the cylinders if you crank a diesel too long without it starting. When starting my engine for the first time after a seasonal layup, I'd always leave the raw water seacock just cracked open a little bit until the engine fired up, then I'd open it all the way.
That's the only way I can think of that seawater could get into an operating diesel.
__________________
Hud
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31-10-2011, 09:16
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#15
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Registered User
Join Date: Feb 2007
Location: Great Neck, N.Y.
Boat: Lancer 30, Little Jumps
Posts: 822
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Re: Exhaust: "Ball Valve"
External exhaust flapper valve very good idea.
Internal in-line flapper valve bad idea...same as one way bilge flapper valve.
Have seen passagemakers with ball valves...but thought bad idea as
would be one more item to worry about if needed motor operating quickly.
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hugosalt
s/v Little Jumps
Lancer 30
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