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Exhaust back flow

M

markyvette

Mark William Clarke
I have a 382 with the exhaust coming out above the waterline port
side of the rudder. Have any of you put a shut off valve atthe
thru-hull or a siphon break in line? I put a siphon break at the
engine water exhange as per surveyor recommendation. Do I need
more?
 
Tony. Don't have any answer for you but, scince you brought it up, I would like to further ask if anyone has had a problem on the 38x series with water being forced back into the engine. I also have a high loop with no siphon break. I have been in 8 to 10 footers and haven't noticed a problem yet.
 
<div>Jay,
As have I, all day long surfing in 10 foot seas, engine fired up on demand with no problems. I interpret this to mean that no water was forced down the exhaust. However, the question does bear merit and raise a point of possibility under the right conditions. Probably would not be a bad idea to install a sea valve if one were to venture off shore for extended cruises.
I wonder about the guy who took his to Tahiti, and what precautions he took to ready his boat?Fred
#165
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Fred. I don't think an anti-siphon valve would prevent water (from overtaking waves) from being forced into the engine. If the exhaust hose were to come adrift it would break the siphon and not allow water to continue to come aboard. I would like to hear from anyone who has had water forced back into the engine and wonder if a flapper valve might not be a solution.
 
<div>Jay,
Yep, that's what I thought I said at least that's what I intended to say, installing a shut off valve of some type.
I notice large powerboats with inboard engines have a flapper over the exhaust to prevent water from entering as their exhaust ports go under water.Fred

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