#1
IP: 142.68.121.160
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Water muffler questions
This old boat (C&C 27 MK II) has an Onan water lift muffler that is 12" diameter and 12" high. It has a side entry and center vertical exit. The base of the muffler is just above the base of the engine, so the manifold outlet and muffler inlet are almost on the same level (the pipe has to have a vertical loop built in).
The MMI SS muffler is only 6"x7" -- half the size. The hose run from muffler to transom is about 8 feet I think, including a 2-foot vertical rise before sloping back to the transom. So, would the smaller MMI muffler work?
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1974 C&C 27 |
#2
IP: 76.180.17.139
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like rigspelt here, i am replacing an onan waterlift muffler of about the same size; i have a c&c 30, not a 27, but the installation is pretty much the same.
i've noticed that west marine carries a waterlift of about the same size, as well as a smaller one a few inches shorter [almost the same size as in the mmi catalogue.] if i get the smaller, will i incur increased backpressure? is there any reason i shouldn't downsize? in other words, which would you all recommend, the smaller or the larger one? thanks in advance, everyone.... keithems
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keithems [1976 c&c 30 mk 1] Last edited by keithems; 06-15-2011 at 10:48 AM. |
#3
IP: 24.224.206.117
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Rigs,
I am close to you (shearwater yacht club). We have one C&C 27 here with an A4. My friend Skip owns it. I think the smaller MMI would work fine. If you get a chance you should email me; we can get a look at what's on Skips.
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Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
#4
IP: 24.138.47.125
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Hard to believe 3 years gone already. I ended up putting in that smaller Moyer stainless water lift and so far it has been working fine. After shut down there is about an inch and a half of water in the bottom. I have not measured back pressure, but I don't think that would be a problem. My main concern had been overfilling, but that concern did not "hold water", so I just "go with the flow".
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1974 C&C 27 |
#5
IP: 206.125.176.3
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rigs, no kidding, remember when you and I were newbies to A4's & this great forum????
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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!!) Last edited by sastanley; 06-15-2011 at 01:37 PM. |
#6
IP: 24.224.206.117
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Sorry Rigs, didn't look at the date of your post..oops! Have a great summer there and I'll keep an eye out on my travels.
All the best.
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Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
#7
IP: 174.65.54.224
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Rigs, You installed the smaller one without waiting for a reply?? Blasphemy!
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"Jim" S/V "Ahoi" 1967 Islander 29 Harbor Island, San Diego 2/7/67 A4 Engine Block date |
#8
IP: 75.68.180.204
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In my C&C 27 I replaced the old steel aqualift muffler with a fiberglass unit (coast guard approved) that was smaller. I just made a pedistal out of plywood, epoxy coated, and matched the outlet height from the steel unit... works fine.
David |
#9
IP: 205.188.117.7
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Do too limited space in the engine compartment I installed a Vetus water lift in my lazarette. I could not transfer the two photos but if you go to my album you can get an idea of the versatility of the Vetus unit. This unit has been in my sloop for over five years. I hope this is of some help.
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#10
IP: 68.94.164.235
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On my E29 I have what must be a standpipe muffler. I don't know the condition but I assume that it isn't new. I was planning to install the water lift muffler and feel I have the space to do that. I have been reading all the information on exhaust systems. Should I stick with a standpipe or can I switch to a waterlift. Which is a better system?
Thanks |
#11
IP: 173.166.26.241
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If you have a standpipe system you should replace it; the water lift system is inferior.
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#12
IP: 24.152.131.220
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Pallen
How about a picture?
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#13
IP: 24.196.126.163
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Pallen - I am on the standpipe bandwagon. In my opinion , which was formed on the wealth of knowledge I gained from this very forum , the waterlift is the alternative exhaust system for those boats which cannot accommodate a standpipe.
Hoping to finish my exhaust re-build today , Laker
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1966 Columbia 34 SABINA |
#14
IP: 24.152.131.220
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In defense of the waterlift
The waterlift is an excellent system that has been used successfully for decades. I'd guess nearly every sailboat built since the mid to late 70's, at least the vast majority, have the waterlift system. The reason we see so many standpipes among the members of this forum is our beloved A-4's were a very popular engine only up to the late 70's or very early 80's when the diesel movement took over. The a-4's popularity dates well before waterlifts became commonplace. Many of our boats, by the fact they even have A-4's, are older than dirt.
The naysayers have 2 valid arguments though, neither of which mean all that much to me:
And yes, a waterlift system is cheaper. So pallen58, if you decide to go to a waterlift system, you'll be in good company. Before you do, be sure you fully understand the dynamics at work to be able to design your system well. Problems with a poorly designed system (sags, traps, long uphill hose runs after the muffler) are not the fault of the waterlift system concept.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
The Following User Says Thank You to ndutton For This Useful Post: | ||
TimBSmith (10-10-2020) |
#15
IP: 148.170.241.1
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Neil,
Can you point to some good resources illustrating proper exhaust installations? I'd love to see some diagrams and detailed instructions as to key required elements. Particularly as it will be the next thing I have to tackle after I drop the engine back into my boat (which I intend to occur before the end of July). I need to take a good look at what's going on with my exhaust system, because I never have taken a good look at it yet. I know it's got a plastic Vetus waterlift, and I suppose I could just keep using that to save the money it would cost to replace it, but by the same token, since I haven't spared any expense in overhauling the engine, and I want to get all my boat's systems to a point where they are solid and reliable and I don't have to worry much about them, I'm thinking I might either convert to a standpipe or at least invest in a better-quality waterlift than the plastic bottle Vetus. I'll have to inspect it, but I'm guessing there is a possibility I might have to replace it, or the exhaust hose, anyhow. Don't know what I'm going to find until I take a good look-see at it. Which I will of course report here...
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- Bill T. - Richmond, VA Relentless pursuer of lost causes |
#16
IP: 24.152.131.220
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Here's the best thumbnail treatment on the subject I've been able to find. It covers both standpipe and waterlift systems. We like to see an antisiphon valve at the high point of the water injection hose in the waterlift system.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
The Following User Says Thank You to ndutton For This Useful Post: | ||
TimBSmith (10-10-2020) |
#17
IP: 193.253.220.149
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Carelessness
With all due respect Neil, I do take exception to the idea that we can create a perfect world and thereby be exempt from accidents/forgetfulness/fatigue or the just plain unforeseen.
Quote:
Given the availability of space, the standpipe system offers the added benefit of peace of mind. This is far from negligible for the person responsible for the boat, even if he is security minded and conscientious. Just my 2 centimes worth...
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Kelly 1964 Cheoy Lee Bermuda Ketch, Wind and Atomic powered |
#18
IP: 107.0.6.130
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Neil's defense of the water lift concept is both commendable and scholarly. Certainly the use of the concept has been widespread and successful for many years. In fact, both Neil and I use it without difficulty. Regarding the issue of back pressure, I have measured mine and found it to be less than 1 psi most of the time - an acceptable figure, but not ideal. Still, I know that I would get better fuel economy and power to the prop if I didn't make my engine use it's exhaust system to drive water uphill. It is the configuration of the boat that should dictate the selection of exhaust concept, not the industry standard or the majority opinion. If I had the configuration I would go to the standpipe concept at once. Don't settle for second prize unless you have no choice.
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#19
IP: 74.103.39.3
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I've have a Vetus Waterlift for years with no problems. If it fits your needs, I wouldn't go out of my way to reinvent my exhaust system. Its a good product and in widespread use for a reason.
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#20
IP: 173.166.26.241
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I agree. I've been using a 50mm (2') Vetus waterlock for 18 years.
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