cooling system operation.

[superharmonix]

Possible dumb question alert:

I have a 1978 Johnson 85hp. I am really getting into boating as a rookie, and want to maek sure of somehting here:
Last August, when it was nearing 100 degrees and the water temp was over 85 degrees, my temp alarm went off. This was a 10 mph lake, and we were putting around at about 2-3 mph most of the day.
My question is, does the cooling system work at a faster/better pace when you are traveling across the water at a faster speed? If you are "putting around" all day, does the system tend to heat up more quickly?

Thanks!

 

[boobie]

Re: cooling system operation.

If all the componets in the cooling system are okay IE: water pump, thermostats and ect are okay you be able to putt all day long.

 

[superharmonix]

Re: cooling system operation.

thank you much!

 

[emdsapmgr]

Re: cooling system operation.

There is a difference in the cooling system from idle to being on plane. At idle, all cooling water must go through two thermostats, one for each head. These act as a restrictor, keeping the powerhead warm-at it's normal temperature. When you are on plane, two pressure relief valves open in the thermostat housing, providing significanly more cooling water to the powerhead in addition to that flowing through the stats. In fact, the powerhead temps may actually go down somewhat when planing. All that aside, Boobies' answer is absolutely correct.

 

[superharmonix]

Re: cooling system operation.

sounds good.
thanks for the help here! BTW- emd: I was born in Springfield, IL. Lived also in Lincoln, Galesburg, Carlysle, to name a few.
Thanks again peeps!