[C38] engine temp
Robert Miller
chapuys at aol.com
Wed Sep 2 18:59:53 EDT 2009
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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