normal head temp on vintage non t-stat motors?

nwcove

Admiral

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May 16, 2011

Messages

6,293

• Sep 21, 2013

• #1

boating is winding down in my neck of the woods, and i want to add and overheat alarm on at least one of my non t-stat motors just for a little project this fall/winter. what temp on the head would be a good point to aim for to have an audible alarm? im thinking around 180 deg?

 

jimmbo

Supreme Mariner

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May 24, 2004

Messages

12,958

• Sep 21, 2013

• #2

Re: normal head temp on vintage non t-stat motors?

The factory overheat lights or horn were activated when the temp reached about 205 deg F

 

HighTrim

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Jun 21, 2007

Messages

10,486

• Sep 23, 2013

• #3

Re: normal head temp on vintage non t-stat motors?

Tim seen this?

Vintage Antique Marine Outboard Engine Boat Temp Alarm Wico 1950 | eBay

 

nwcove

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May 16, 2011

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6,293

• Sep 23, 2013

• #4

Re: normal head temp on vintage non t-stat motors?

thanks Chris, i did see that one. i was more thinking of a home made thing....done on the cheap. a snap disc, and a few parts from radio shack. hopefully all for under $20. ( maybe less if can scrounge a disc and a three v buzzer!!!)

Automatic Reset Thermostat (SN-8),Automatic Reset Thermostat (SN-8) Manufacturers

 

S

Sandor27

Seaman

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Feb 28, 2011

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69

• Sep 23, 2013

• #5

Re: normal head temp on vintage non t-stat motors?

Wow, I just posted a writeup on a thermal cutoff switch. You could use the same switch and power a horn with it. I chose to just shut the motor down and wired it into my kill switch circuit. So in the event of an overheat (I chose 185?F) my motor shuts down.

Thermal Switch from Digikey

http://www.cantherm.com/products/thermal_cutouts/cantherm_f_type.pdf

 

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nwcove

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May 16, 2011

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• Sep 23, 2013

• #6

Re: normal head temp on vintage non t-stat motors?

lol sandor.....just read your post, and looked into your choice of thermal switch!! looks like a perfect application. i would prefer to have an audible alarm activated tho as opposed to a shut down. ( in a bad situation i would run a motor until it would run no more) jmo

 

HighTrim

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Jun 21, 2007

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10,486

• Sep 23, 2013

• #7

Re: normal head temp on vintage non t-stat motors?

^^^^Yeah in shark infested waters I would rather listen to the buzzing over getting eaten by Great Whites if my motor was running at 186 degrees, lol

 

S

Sandor27

Seaman

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Feb 28, 2011

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69

• Sep 23, 2013

• #8

Re: normal head temp on vintage non t-stat motors?

My little 9.9 does not have electric start, nor does it have an alternator. I would have to have a battery for the alarm. I put a connector in line with the thermal switch so I can disconnect it in case of component failure or shark infested overheats.:fish2:

 

Last edited: Sep 23, 2013

HighTrim

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Jun 21, 2007

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10,486

• Sep 23, 2013

• #9

Re: normal head temp on vintage non t-stat motors?

Kidding of course Sandor. Im impressed, like it! I like your choice of product.

 

nwcove

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• Sep 23, 2013

• #10

Re: normal head temp on vintage non t-stat motors?

my thought is only an opinion.....no sharks involved!! ......i still think an alarm is better than a shut down. ( and yes....a complete/instant cooling failure will shut you down before any alarm will save the day!!)