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Old 12 September 2014, 10:55   #1
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Steaming mid-section [Yamaha 30 2S]

When the sun is shining, the water is calm and everything just works there is nothing better...

However, after plodding along at 6.5 kts for a mile or so I noticed the mid-section had got hot enough to be steaming significantly. Of course, it will always be pretty warm but I hadn't seen an engine steam like that before.

The tell-tale streams like a horse weeing after a lot of cold lager;
The water from the tell-tale isn't hot;
The engine runs OK;
On each cylinder the compression is OK and almost identical to the other;
The steam doesn't seem to be coming from the low-speed exhaust - its just a fog around the mid-section;
It is definitely steam, not exhaust.

A few knots more and it seems to disappear.

Have I just not noticed this in the last thirty years or is this 'outside normal parameters'?

Cheers
Hugh
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Old 12 September 2014, 11:14   #2
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Normal I'd say - there is some hot exhaust gasses runing down there - stuff gets hot with no spray/ fast airflow around it at 6knts and you look back to see steam .

Usualy at 'quick' speeds you'd never see it as its blown away too fast ...
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Old 12 September 2014, 12:50   #3
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Quote:
Originally Posted by PeterM View Post
Normal I'd say - there is some hot exhaust gasses runing down there - stuff gets hot with no spray/ fast airflow around it at 6knts and you look back to see steam .

Usualy at 'quick' speeds you'd never see it as its blown away too fast ...
Had this early in the year but put it down to sea temp.Get hold of a thermometer it will tell the tale on the tell tale.As long as you have water flow shouldn't be a problem.
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