[C38] engine temp

William Knowles whk1965 at gmail.com
Wed Sep 2 20:09:50 EDT 2009 

I have a Kiwi 3 blade I get 6 knots at 2100.Bill Flying Goose

On Wed, Sep 2, 2009 at 6:59 PM, Robert Miller <chapuys at aol.com> wrote:

> 1800 RPM and 6.5?  What kind of a prop are you using?  I am using an
> Autoprop and can't get much more than 2500.  It may be too big.  I ordered
> the 299818 and will install it this weekend.  Any tips on installation?  Do
> I need to run water through it to prime it?
>
>
>
> Thanks,
>
>
>
> Bob
>
> "Bolero" San Diego
>
>
>
>  _____
>
> From: listserve-bounces at catalina38.org
> [mailto:listserve-bounces at catalina38.org] On Behalf Of Steve Smolinske
> Sent: Tuesday, September 01, 2009 8:53 PM
> To: Catalina 38 Listserve
> Subject: Re: [C38] engine temp
>
>
>
> Scott
>
>
>
> The link Charles posted earlier
> http://www.go2marine.com/product.do?no=97977F  was less than the link I
> posted, they are about $320. the 3 x 17 I purchased fit right inplace,
> although I did fabricate brackets to accomodate the larger radius as well
> as
> four T bolt clamps.  I also needed to swap out the 1/2 hose barb on the raw
> water pump to accomodate 7/8.   On my 2 x 16 exchanger the inlet for raw
> water was 1/2.   The universal p/n for the 3 x17 is 299818 it has 7/8 fresh
> water ports and 5/8 raw water.  The 299835 is 3 x 13 and has the same size
> ports as the 299818.
>
>
>
> I also had to step down hose size from the manifold to my heater (1" to
> 5/8)
> and from the heater to the exchanger I used a 5/8 to 3/4 hose barb in order
> to step up to 7/8 going into the exchanger.  Last going from the exchanger
> to the fresh water pump the same holds true with stepping up from 7/8 to 1"
>
>
>
> curious when you cruise at 2400 how fast are you going?  I generally keep
> it
> at 1800 and do about 6.5
>
>
>
> Steve
>
> Peregrine #312
>
> Seattle
>
>
>
>
>
>  _____
>
> From: listserve-bounces at catalina38.org on behalf of Ann Boochever
> Sent: Tue 9/1/2009 7:29 PM
> To: Catalina 38 Listserve
> Subject: Re: [C38] engine temp
>
> Even with 52 degree water in Alaska, our 2" heat exchanger has been just
> passable at 2400 rpms. Is there an off-the-shelf replacement that is larger
> and would fit in the same location, or do they have to be built to order?
> Thanks
> Scott and Ann
> Tacita II
> Juneau, AK
>
> On 9/1/09 5:48 PM, "Les" <hlhowell at pacbell.net> wrote:
>
> > Thanks, Tom,
> > I figured you would be the one with the answer.  I am an engineer
> > wannabe, so I study things pretty thoroughly, but I find I sometimes
> > miss a detail, such as the one you point out here.  Too hot is not good
> > for any engine.
> >
> > Regards,
> > Les H
> > On Tue, 2009-09-01 at 21:11 -0400, Tom T. wrote:
> >> Hi Les,
> >>
> >> You claim you don't want to appear stupid and then you go on to show you
> >> are fairly astute about diesel engines.
> >>
> >> As you pointed out, the thermostat should regulate the engine
> temperature
> >> for optimum performance.  The problem we have is that the original heat
> >> exchangers on many of our engines were just too small and if the water
> >> returning from the heat exchanger is still hotter than the operating
> >> temperature of the engine, the engine is gonna overheat, clear and
> simple.
> >>
> >> You cannot have a heat exchanger too large but you can have one too
> small.
> >> If you had a heat exchanger ten times larger than you needed, it would
> just
> >> mean your thermostat would regulate the coolant flow slower so that the
> >> operating temperature would still be at the thermostat temperature.
>  With
> >> the reduced flow from a very large heat exchanger, the flow would be
> slowed
> >> to a trickle but the engine would still operate at the correct
> temperature.
> >>
> >> Another plus of an oversize heat exchanger is that it gives a margin of
> >> safety in case you pick up some debris causing a reduction of cooling
> >> efficiency.  The little 2" heat exchanger that came with the 5424 had
> >> absolutely no reserve cooling capacity at full throttle, especially in
> >> tropical waters.  Add debris restriction and you have a meltdown, even
> at
> >> moderate speeds.
> >>
> >> Tom Troncalli
> >>
> >>
> >>
> >>
> >>> [Original Message]
> >>> From: Les <hlhowell at pacbell.net>
> >>> To: <tdtron at earthlink.net>; Catalina 38 Listserve
> >> <listserve at catalina38.org>
> >>> Date: 9/1/2009 8:43:19 PM
> >>> Subject: Re: [C38] engine temp
> >>>
> >>> Hi, everyone,
> >>>
> >>> I don't want to appear stupid, but I am.
> >>>
> >>> Diesel engines are basically heat engines.  Most are designed to run at
> >>> some temperature range.  If they don't get to that range, they become
> >>> very "dirty", with carbon and so forth, including poor combustion and
> >>> greater nasty air products.  Does anyone have any information about
> what
> >>> the "design" temp was for the original engines (I have an XP-25B in
> JACE
> >>> now and it came with a larger heat exchanger, but that is no
> indication,
> >>> as the engines internals will determine how much cooling is right.)  If
> >>> the thermostat is working right, the engine should maintain the right
> >>> temperature I think, but I don't know for sure.  The mechanical
> >>> thermostats are in essence a two element spring that holds them closed,
> >>> with a waxy cap that will solidify when the engine is cold to keep it
> >>> shut until the engine warms up enough to run right.  These thermostats
> >>> are really simple, but a vital piece of equipment for a diesel.
> >>>
> >>> Regards,
> >>> Les H
> >>> On Mon, 2009-08-31 at 08:22 -0400, Tom T. wrote:
> >>>>
> >>>> Ditto,
> >>>>
> >>>> This sounds like my own experience.  That little original 2" heat
> >>>> exchanger has to go to the Davy Jones locker for good!
> >>>>
> >>>> Tom Troncalli
> >>>> Renata #95
> >>>>
> >>>>
> >>>>         ----- Original Message -----
> >>>>         From: Steve Smolinske
> >>>>         To: Catalina 38 Listserve
> >>>>         Sent: 8/31/2009 2:33:21 AM
> >>>>         Subject: [C38] engine temp
> >>>>
> >>>>
> >>>>         fyi
> >>>>
> >>>>         as a follow up to earlier discussions on engine cooling, I
> >>>>         replaced the 2" x 16" heat exchanger with a 3 x17 and dropped
> >>>>         30 degrees off of my normal operating temp.  went from 190 to
> >>>>         160 under way. With the larger exchanger I was also able to
> >>>>         step up to 5/8 from 1/2 hose from the raw water pump to the
> >>>>         exchanger.  Im amazed at how much smoother, quieter and less
> >>>>         labored the engine sounds now.
> >>>>
> >>>>         Steve
> >>>> _______________________________________________
> >>>> Listserve mailing list
> >>>> Listserve at catalina38.org
> >>>> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
> >>
> >>
> >>
> >> _______________________________________________
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> >
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-- 
W H Knowles
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