Originally posted by hanleyclifford
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description/difficulty of FWC install?
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This is a sticky topic.
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Originally posted by JonnyQuest View PostYour last comment-- what are you referring to when you said to scrutinize the hot section at the same time? Are you referring to the condition of the piping, unions, etc. coming from the engine-- the portion covered by the asbestos wrapping, correct?
Plenty of threads on the forum regarding hot sections, their design and construction.Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Hanley,
I'm fascinated with your thru-hull mounted pump and have more questions.
As I recall, you have a waterlift exhaust system, my question does not apply to a standpipe. One of the charms of the conventional engine driven impeller pump is it pumps an amount of water proportionate to the engine RPM and accordingly the exhaust has to lift an amount of water proportionate to exhaust volume and pressure.
So, my question is: with your electric raw water pump operating at full volume at all times, even at idle, have you ever experienced an issue or had a concern with the exhaust's ability to handle the flow?
I seem to remember Thatch's electric pump FWC system design used the electric pump (not thru-hull mounted) to circulate the FW side of the system partly for this reason.
Other questions:
Is there a debris problem in your area? Here in SoCal we deal with kelp. There are floating kelp patties (fish hotels) all over the place, even mid channel to Catalina. I've reverted to a non-strainer thru-hull and a raw water strainer to deal with it. If the thru-hull gets clogged I can pull the hose and rod it out. Otherwise, I count on the strainer to handle anything that's sucked up. Have you had any thru-hull/pump clogging issues and if so, how did you resolve it?
Do you have a raw water strainer? My understanding is the seals on raw water strainers are designed for negative pressure whereas a strainer in an application such as yours would be in a positive pressure situation. Maybe the pressure is so small that it's not a problem.
As you can tell, I'm interested in your experience. Right now I'm flushing my RWC engine after each use but I'd like to add FWC someday. The Catalina 30, for reasons mentioned previously, has some real space problems when it comes to FWC so these electric pump installations, like yours and Thatch's, get my attention.Last edited by ndutton; 11-24-2010, 11:18 AM.Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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sidebar!!
JQ,
I think you need a safety wire on that square locking nut on the shaft coupler. If that ever backed out, the shaft could slide out of the boat in reverse.
Don't forget to wear a mask when you unwrap that stuff since we don't know what it is.-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
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What's the safety wire?
Originally posted by sastanley View PostJQ,
I think you need a safety wire on that square locking nut on the shaft coupler. If that ever backed out, the shaft could slide out of the boat in reverse.
Don't forget to wear a mask when you unwrap that stuff since we don't know what it is.
I'm a new owner with plenty of wet behind my ears, and don't know what you are referring to regarding a safety wire on the shaft coupling. Could you elaborate on what it is, where to get it, maybe a pic from someone?
Not knocking the previous owner, but there are a lot of issues that I need to learn and take care of on this boat to bring it back up to speed-- it sails and the engine runs, but I can see that there's a lot of deferred maintenance going on here.
But then it wouldn't be a sailboat if there wasn't an endless to-do list, would it?JonnyQuest
Boatless right now.
(Last boat, a fine 27' O'Day 1975)
MS Gulf Coast
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-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
sigpic
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Originally posted by ndutton View PostHanley,
I'm fascinated with your thru-hull mounted pump and have more questions.
As I recall, you have a waterlift exhaust system, my question does not apply to a standpipe. One of the charms of the conventional engine driven impeller pump is it pumps an amount of water proportionate to the engine RPM and accordingly the exhaust has to lift an amount of water proportionate to exhaust volume and pressure.
So, my question is: with your electric raw water pump operating at full volume at all times, even at idle, have you ever experienced an issue or had a concern with the exhaust's ability to handle the flow?
I seem to remember Thatch's electric pump FWC system design used the electric pump (not thru-hull mounted) to circulate the FW side of the system partly for this reason.
Other questions:
Is there a debris problem in your area? Here in SoCal we deal with kelp. There are floating kelp patties (fish hotels) all over the place, even mid channel to Catalina. I've reverted to a non-strainer thru-hull and a raw water strainer to deal with it. If the thru-hull gets clogged I can pull the hose and rod it out. Otherwise, I count on the strainer to handle anything that's sucked up. Have you had any thru-hull/pump clogging issues and if so, how did you resolve it?
Do you have a raw water strainer? My understanding is the seals on raw water strainers are designed for negative pressure whereas a strainer in an application such as yours would be in a positive pressure situation. Maybe the pressure is so small that it's not a problem.
As you can tell, I'm interested in your experience. Right now I'm flushing my RWC engine after each use but I'd like to add FWC someday. The Catalina 30, for reasons mentioned previously, has some real space problems when it comes to FWC so these electric pump installations, like yours and Thatch's, get my attention.
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