[C320-list] exhaust mixing elbow

[Robert Seastream]

We're on one of four moorings off Hilton Park (just downriver of the  
bridge over Dover Point) belonging to Great Bay Marine.
That way we don't have to wait for low tide, which is the only time we  
can squeak under that bridge.
The run out to Portsmouth Harbor takes about an hour or less.  We  
still try going with a fair tide.
You grew up in Dover?  Where are you these days?

Bob Seastream
Intuition # 906

On Sep 20, 2008, at 7:45 AM, Jack McDonough wrote:

> If you come down through Portsmouth Harbor, you must start in Great  
> Bay at Dover Point. (I grew up in Dover.) That's a long way in and  
> out, isn't it? And Great Bay looks to have some swirly currents. And  
> the current under those bridges in Portsmouth are swift, with a  
> capital S.
>
>
>
>
> ----- Original Message ----- From: "Robert Seastream" <robert.seastream at comcast.net 
> >
> To: <C320-List at Catalina320.com>
> Sent: Friday, September 19, 2008 5:12 PM
> Subject: Re: [C320-list] exhaust mixing elbow
>
>
>> We have about an hour run to get downriver and out of Portsmouth   
>> harbor to offshore.  We run at 2400 for fuel economy, 3000 if we  
>> have  to hustle to make the bridge openings.  3200 is the  
>> continuous max  rating for our Yanmar 3GM30F.  Once or twice a  
>> year, I run WOT (3600  rpm; coincides with the one hour engine  
>> rating) for about 15 minutes.   Never had 'smoke' issues, however  
>> our engine only has about 300 hours  on it.  Engine temps range  
>> from 160 to 180 degrees farenheit under  those respective conditions.
>>
>> Bob Seastream
>> Intuition # 906
>>
>> On Sep 19, 2008, at 6:04 PM, Allan S. Field wrote:
>>
>>> We make sure that every time we run the engine, we run at 3,000  
>>> rpm  for at
>>> least 5 minutes.  600 hours and no smoke although we intend to  
>>> pull  and
>>> clean the elbow prophylactically this winter regardless.
>>>
>>> Allan S. Field
>>> Sea Shadow - #808
>>> Columbia, MD
>>>
>>> -----Original Message-----
>>> From: c320-list-bounces at lists.catalina320.com
>>> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of  
>>> Crosby Roper
>>> Sent: Friday, September 19, 2008 5:42 PM
>>> To: c320-list at catalina320.org
>>> Subject: [C320-list] exhaust mixing elbow
>>>
>>> Thought I'd pass this along for general lesson learned file. In  
>>> july  on my
>>> way back from Catalina island to San Diego, I noticed that when I   
>>> ran the
>>> RPM's up to 3200, I got a bit of black/brown smoke from exhaust.   
>>> Since water
>>> tanks were full and there was a bunch of stuff on board, I figured  
>>> probably
>>> just overloading the engine was the problem. On my next trip to   
>>> catalina on
>>> Labor day, I noted smoke at 3000 RPM. To make a long story short,  
>>> the
>>> problem progressed rap[idly over the next 30 hrs of engine use to   
>>> the point
>>> where even at 2000 RPM i was seeing smoke. We limped back to the   
>>> slip and
>>> called mechanic ( to whom I had spoken while in Catalina and who  
>>> had advised
>>> me that problem was likely a clogged exhaust mixing elbow and OK  
>>> to  run
>>> engine at low RPM as long as it was not producing smoke.) He came   
>>> out on
>>> Monday and problem was indeed exhaust mixing elbow. The engine is  
>>> 3 years
>>> old and has about 220 hrs on it. He admonished me for not using  
>>> the  boat
>>> enough (in front of my wife, which should work out well for future  
>>> sailing
>>> schedule) and for babying the engine. So, for anyone else who  
>>> tends  to baby
>>> their diesel, run it frequently and run it hard. But we already know
>>> that!Crosby Roper, VMD
>>> Tethys # 1054
>>> _________________________________________________________________
>>> See how Windows connects the people, information, and fun that  
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>