[Sentoa] Wet Exhaust Systems?

[Mike Pedersen]

Thanks for the feedback.  I think I'll still try and keep a waterlock
incorporated as I'm a belt and suspenders kind of guy.  Eleven years in the
US submarine force did that to me...

Regards,

Mike


On 6/5/08, Ron Antaya <Ronald.Antaya at noaa.gov> wrote:
>
> Mike - There is no check valve or water lock currently installed on the
> boat. The exhaust manifold is slightly higher than the muffler, so I suspect
> the mechanic that did the install deemed a water lock or check valve
> unnecessary.
>
> Ron Antaya
> Y-KNOT 26-056
> Juneau, AK
>
> Mike Pedersen wrote:
>
> Thanks Ron!
>
> I have one of the few owner finished boats so I am not familiar with the
> factory hull configuration.  I currently have a short (~3') length of hose
> from my elbow to a waterlock, then a long strech of hose to a muffler in the
> laz, then another short stretch of hose to a gooseneck, which then exits the
> hull.  My fuel tanks are located port and starboard in the laz with a single
> centerline water tank.
>
> Do you have a short strech of hose from your elbow to a waterlock and
> another strech of hose to a muffler in the laz?  Or do you have a long
> stretch of hose from the elbow to a waterlock in the laz?
>
> Regards,
>
>   Mike Pedersen
> Northern Spy NT 26-028
> Powell River, BC
>
>
> On 6/4/08, Ron Antaya <Ronald.Antaya at noaa.gov> wrote:
>>
>> Mike -
>>
>> We recently purchased Y-KNOT (26-056), which is the second 26' NT that
>> we've owned. Y-KNOT was re-powered by the previous owners in 1996 with a
>> Yanmar 4JH2-HTE (turbocharged) and fitted with a Centek wet exhaust. Out
>> previous NT 26 (ELEANOR G - 26-055) was equipped with a naturally aspirated
>> 41 hp Lugger fitted with a similar Centek wet exhaust. The Yanmar is much
>> quieter than the Lugger but not quiet enough to eliminate a good muffler
>> altogether. The Centek exhaust is mounted on a small piece of plywood (about
>> 2' x 2') that is affixed above the keel pocket (just aft of the fuel tank)
>> and works just fine. It's quiet enough that when I'm warming the engine up
>> before a trip (hi idle, 800-1000 rpm) and my head is stuck into the laz
>> checking the bilge, steering and rudder post , the only sound that I can
>> hear from the Centek is the slightest sound of water swooshing around.
>>
>> Ron Antaya
>> Y-KNOT 26-056
>> Juneau, AK
>>
>> Mike Pedersen wrote:
>>
>>  I am soliciting opinions on exhaust systems.
>>
>> I will be repowering my 26' NT soon with a Volvo D2-75.  I currently have
>> a 43hp BMW with a 2" Vetus exhaust system (waterlock, muffler and
>> gooseneck).  The Vetus is relatively quiet and has survived 27 years of
>> operation.  The only manufacturers that I see in the marine wet
>> exhaust market are Centek and Vetus.  One advantage I see of Vetus is that
>> the waterlocks (LP series) fit down into the keel pocket.  Is this where
>> most 26' boats have the waterlock?  Is anyone running something different?
>> Generally turbos quiet both the intake and the exhaust.  Are those with
>> turboed engines running a muffler?  I will be upgrading the system to 3.5"
>> and would like to get it right the first time.
>>
>> Mike Pedersen
>> Northern Spy NT 26-028
>> Powell River, BC
>>
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