[C320-list] exhaust elbow question

[Chris Burti]

FWIW,

I agree with the need to wait for intital lubrication
and to warm up fully before loading, but also feel a
little more RPM is required during the initial
warm-up.

I have observed that if I run the throttle up a little
(1100-1400 RPM) a minute after starting, my Yanmar
runs significantly smoother and quieter. 

A couple of minutes later, after it begins to warm up,
you can hear it get even smoother. Then, I throttle it
back down to idle RPM to allow it to fully warm up
before loading it in gear. 

This is pretty much what my old Olds diesel did
automatically for itself and may be what is being
recommended by the pro's.



--- Stanley Rogacevicz <SROGACEV at holycross.edu> wrote:

> Jon,
>    I wonder if Mack's statement was taken a bit out
> of context or if it
> was a quick answer 'shot from the hip' to a question
> in the class ?
> Maybe he meant periodically or something ? I know
> ... big mouth that I
> am .... I would have had to raise my hand to say
> something like - That
> goes against everything I have ever heard about
> internal combustion
> engines over the last 40 years - Explain Please. My
> assumption would be
> that the best time to blow out the carbon dust is
> while its cold and not
> so sticky, but that seems to be a very extreme
> measure. I know I have
> read articles that basically said that the first 10
> seconds of an
> engines day is when all the Wear/Damage occurs....
> the rest of the day
> is just a well lubricated coast in comparison. While
> Jeff's comment
> about the difference between Gas and Diesel not
> washing the lubrication
> off the cylinder walls is fine that's just a small
> portion of the engine
> parts that need pressurized lubrication to stay
> alive. The thought of a
> relatively dry rod bearing starting at full throttle
> gives me shivers.
> Stan
> formerly "Christy Leigh"
> c320 #656
> Wickford/Narragansett Bay RI
> 
> >>> <jonvez at comcast.net> 10/6/2006 9:32 AM >>>
> Bruce,
> 
> I agree and will change my SOP. One has to balance
> logic against all of
> the 'experts' out there--another testament to this
> list as it's great to
> bounce these things off everyone and get a sanity
> check.
> 
> Regards,
> 
> Jon
> 
> -------------- Original message -------------- 
> From: "Bruce Heyman" <BruceHeyman at cox.net> 
> 
> > Jeff/Jon, 
> > If you only put 50-100 hours on your engine per
> year then you have at
> least 
> > 40 years before you have to worry about it. If
> however you are
> blessed with 
> > year round access to the water but cursed by the
> typical wind
> forecast of 
> > "....light and variable, less than 10 knots...."
> which translates to
> 2,3 or 
> > 4 knots at best and almost guaranteed to be on the
> nose you will put
> on may 
> > more hours. 
> > 
> > The typical 18 wheeler seems to get 1m miles or
> more before the
> engine is 
> > torn down or replaced. I'm guessing that they are
> only driving on the
> road 
> > for 2-3000 hours per year but they generally leave
> the engine idling
> even 
> > when they are eating, sleeping, fueling, loading,
> being weighted....
> so they 
> > probably end up with 5-6000 hours per year. At a
> million miles that
> means 
> > that they rebuild/replace after about 7 years or
> 42,000 hours. 
> > 
> > Wouldn't it be great if we could get 42k hours out
> of your little
> diesels! 
> > Now that our boats are made out of what Hershoft
> called "frozen snot"
> the 
> > boats last forever, provided they are reasonably
> maintained and
> upgraded. 
> > Which means that boats that are 30-40 years old
> are very serviceable
> and 
> > very popular and usually are priced in the 20-30k
> range? Not fun when
> you 
> > have to spend 8-15k to re-power, you will never
> get that money back!
> 
> > 
> > While I could be wrong I don't think I agree with
> it is ok to rev the
> engine 
> > when it is cold, even when it is during warm
> weather. Our engines are
> made 
> > with all sorts of alloy's which have different
> temperature
> coefficients of 
> > expansion. The designers take these into account
> when they design and
> 
> > manufacture the engines. This means that when the
> engine is cold you
> do not 
> > have the right tolerance in the bearings, gears,
> rings, valve stems,
> push 
> > rods.... This means then when our high compression
> engines fire all
> this 
> > "slop" results in additional noise, vibration and
> it would seem to me
> wear. 
> > 
> > When we start our engine we seem to go through two
> transitions. The
> first 
> > is very quickly after starting, the low oil alarm
> goes off and the
> really 
> > loud pinging becomes just loud pining. I assume
> this is most of the
> parts, 
> > lifters, bearings, rings.... are getting a dose of
> oil. The second 
> > transition is after 3 to 10 minutes and seems
> rather abrupt. I assume
> the 
> > combustion chamber is now up to temperature and
> the fuel is being
> burnt 
> > evenly, the engine just seems to settle down and
> run smother and
> quieter. 
> > 
> > I think I'm going to continue to be gentle (no
> throttle) with the
> engine at 
> > start but based on this discussion I am going to
> rev the engine at
> the end 
> > of the day before it is put away for the last
> time. What do people 
> > recommend, let it run up to 4000 RPM and then pull
> the kill or run it
> up to 
> > 4000 RPM then throttle back and kill it when it is
> back to 900? 
> > 
> > Bruce 
> > Somerset 671 SoCal 
> > 
> > -----Original Message----- 
> > From: c320-list-bounces at catalina320.com 
> > [mailto:c320-list-bounces at catalina320.com] On
> Behalf Of
> jonvez at comcast.net 
> > Sent: Wednesday, October 04, 2006 9:58 AM 
> > To: catalina at thehares.com; C320-List 
> > Subject: Re: [C320-list] exhaust elbow question 
> > 
> > Jeff, 
> > 
> > I think you have the right perspective...The same
> mechanic/trainer
> also 
> > said, anything you do to these engines may be a
> matter of whether you
> 
> > rebuild it after 4000 hours or 10,000 hours-- at
> 50-100 hours a year,
> either 
> > way, it's a loooong time and a lot of abuse..... 
> > 
> > Regards, 
> > 
> > Jon Vez 
> > 
> > -------------- Original message -------------- 
> > From: "Jeffrey Hare" 
> > 
> > > Hi Guys, 
> 
=== message truncated ===


Chris Burti
"Commitment"
Catalina 320, #867, 
Farmville, NC

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