| Author |
Message |
    
narrabay
Advanced Member
Username: narrabay
Post Number: 42
Registered: 02-2016
| | Posted on Monday, March 28, 2016 - 02:54 am: | 
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I wonder do these old one-cylinder engines run no thermostat, or is there a universal in-line thermostat available? |
narrabay
Advanced Member
Username: narrabay
Post Number: 45
Registered: 02-2016
| | Posted on Thursday, March 31, 2016 - 12:53 am: |
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? anyone? |
bartropr
Senior Member
Username: bartropr
Post Number: 83
Registered: 06-2006
| | Posted on Thursday, March 31, 2016 - 02:36 am: |
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I run my 1908 four stroke by controlling the feed to the geared pump.I then manually feel the output pipe temperature. I have also fitted a non permanent mechanical thermometer which is clipped on with a spring.I tried a digital one, but the magneto stopped it working properly |
yuknat
Member
Username: yuknat
Post Number: 8
Registered: 07-2014
| | Posted on Thursday, March 31, 2016 - 10:07 am: |
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Historically these engines were not run with thermostats, the water pump regulates the temperature very well. |
ernie
Senior Member
Username: ernie
Post Number: 2242
Registered: 01-2002
| | Posted on Thursday, March 31, 2016 - 10:41 am: |
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Note on Salt/raw water cooling If you are operating in salt water. Salt water tends to build up a corrosive scale when the engine operates above 140�. In the raw water system this scale is building up inside the engine's water jacket and ports. When the scaling builds to the point that water flow is restricted the engine starts to overheat. At this point you are probably looking at replacing the engine. |
narrabay
Advanced Member
Username: narrabay
Post Number: 46
Registered: 02-2016
| | Posted on Thursday, March 31, 2016 - 11:19 am: |
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Thanks for the info guys. I assume the water pump regulating the temp means the faster rpm, the more water which maybe keeps temps in some sort of broad range of "warm"?
Ernie, not sure about others but my YT will never see salt water only protective engine coolant through a keel pipe loop. |
yuknat
Member
Username: yuknat
Post Number: 9
Registered: 07-2014
| | Posted on Thursday, March 31, 2016 - 11:35 am: |
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The boat I'm planning for my YT1 will have keel cooling as well. That's the way to go, I try to never pump water onboard any of my boats |
narrabay
Advanced Member
Username: narrabay
Post Number: 47
Registered: 02-2016
| | Posted on Thursday, March 31, 2016 - 11:43 am: |
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one issue is how to cool the exhaust when keel cooling the engine. cant run that antifreeze into the exhaust obviously.
in my case I envision possibly a second very small jabsco pump to grab a little raw water and put it into the exhaust. but a YT has no pulley so that has to be worked out. I think there are more bottom ends than cylinders left of these engines. if I could find a spare flywheel, I'd have a machine shop turn a vee belt groove into it and do it that way. |
scott_n
Senior Member
Username: scott_n
Post Number: 262
Registered: 02-2008
| | Posted on Thursday, March 31, 2016 - 01:39 pm: |
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in a closed system with a keel cooler and a expansion tank a bypass valve can be added to control engine temp |
narrabay
Advanced Member
Username: narrabay
Post Number: 48
Registered: 02-2016
| | Posted on Friday, April 01, 2016 - 03:28 am: |
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scott, you mean a thermostat bypass? I saw some made for snowmobiles that are about right. I'm not going to care much about this really just wanted to ask what was OEM. would be nice to eventually fit an inline. I may have one turned on a lathe that can fit a small, common thermostat. give it an art-deco look so it looks like it belons there but that would be way down the line |
ernie
Senior Member
Username: ernie
Post Number: 2243
Registered: 01-2002
| | Posted on Friday, April 01, 2016 - 07:49 am: |
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Chris,
You are going WAYYYYYYYYYYYYYYYY toooooooooooo
high tech.
Just put the engine in the boat and enjoy it.
There were thousands of them that ran for an incredible amount of years salt water cooled.
Keel cooling yours will help it last at least another 70 years. |
narrabay
Senior Member
Username: narrabay
Post Number: 51
Registered: 02-2016
| | Posted on Friday, April 01, 2016 - 03:29 pm: |
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Hi Erniw I appreciate you hoping to save me from myself lol! Here is what I have in mind, having a smaller one made and use smaller tstat from an outboard or any common application (this one is 1.5" hose, I need 1/2"). It would be no big deal to insert something like that into the outflow hose to the keel cooler and have a nice warm engine in any weather.  |
ernie
Senior Member
Username: ernie
Post Number: 2245
Registered: 01-2002
| | Posted on Friday, April 01, 2016 - 07:28 pm: |
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Chris,
The YT1 has a positive displacement pump.
You can not restrict or stop coolant flow.
A thermostat for this type of system needs to have 3 ports. In out and bypass.
If you don't have a bypass the pump can and most likely will make enough pressure to push connections apart or crack castings.
By the way the engine was designed to run at less than 150 deg F There is a hot spot near the spark plug that has no water jacket. What will happen at 180/190 is anybody's Guess |
narrabay
Senior Member
Username: narrabay
Post Number: 54
Registered: 02-2016
| | Posted on Saturday, April 02, 2016 - 04:58 am: |
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ernie that is technically awesome information and I thank you. future visitors will benefit as well. |
ernie
Senior Member
Username: ernie
Post Number: 2247
Registered: 01-2002
| | Posted on Saturday, April 02, 2016 - 08:34 am: |
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Simple solution
http://www.oldmarineengine.com/discus/messages/5/271747.html |
