Newbie. How to supply more air to my engine compartment.

PaulRainbow said:
What a fantastic bit of kit these old Volvo engines are.

Where can i get one from ?

I'm going to fit one into a small shed next to my house and run some ducting to each room. If it heats the area around it to 70c and that area can't be cooled by removing the air with a fan it'll be a great way to heat the house. I may even run some ducting to the neighbours too, i'm sure they'd be happy to pay for half the meagre fuel bills.

Must be close to perpetual energy.
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Love it!
They are still doing it, ignoring the original question header!
Stu
 
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Tranona said:
A fan will draw hot air out - obvious because the engine compartment is full of hot air because it has a hot engine in it. however, it will not reduce the air temperature in the box. So of course the outlet will be hot - it is blowing hot air from the compartment where its intake is sited! As i said 10 hp donks run at 70C so the surrounding air in a confined space will be at or near that temperature.

A fan will make no difference when the engine is running, but may reduce the temperature more quickly when the engine is stopped, as well as removing some of the smell.
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70 deg inside, a 4" snail type fan taking that hot air from the top of the compt. 25 deg air coming in through a 4" pipe from the outside! Come on!
 
High temperature and smell. Plus in the 37 years since its been fitted we have some different expectations, and available hardware are the main reasons.
Interesting that the md7 is cool running.
 
Yeah, still shouldn't smell of Diesel!!

Diesel is in the tank, the lines and the pumps but not on the outside.

Jizer and wash the engine to thoroughly clean off any old oil deposits and it should smell neutral. :encouragement:
 
michaela said:
I bought an old sailing boat with an old volvo md6b (10 hp) engine, which I've grown attached to, having done about 90 hours of motoring with it when travelling around Holland with the boat, and bringing it back to the UK this year.
The engine cabinet is very close fitting and I have measured the air temperature after running the engine for short time intervals and it is very hot. I have fitted an rpm guage and don't run the engine at greater than 80 percent of its max rpm . Because of the close fitting nature of the cabinet I'm convinced that the engine air supply needs to be improved. I could do this by fitting louvres but if I ship a load of water I don't want the engine to be under water. Also by making holes in the front of the cabinet I'm going to be screwing up the sound insulation.
The engine sits under the cockpit sole and is isolated from the side lockers. The boat is a Varne 850.
What are my options? Preferably low cost as there are multiple other boat things I need to spend my money on (under the wifes radar).
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If you do go down the route of purchasing a fan, be aware that the inline ones are pretty " frantic" ie noisy. The "snail" shaped ones are quiet in comparison.
Stu
 
skipper_stu said:
70 deg inside, a 4" snail type fan taking that hot air from the top of the compt. 25 deg air coming in through a 4" pipe from the outside! Come on!
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So you are agreeing with me. Hot air will come out - but where does the 4" inlet come from? It may on your boat but not on the OPs. That is why your set up with a 50kw engine in a vastly larger space is completely irrelevant to his "problem".

There is no positive inlet or outlet. Engine boxes of his type are tight fitting and usually draw air from the bilge and no specific outlet. So they get hotter than your more spacious and positively vented compartment. However, provided the engine runs at its normal working temperature it should never be too hot.
 
Tranona said:
So you are agreeing with me. Hot air will come out - but where does the 4" inlet come from? It may on your boat but not on the OPs. That is why your set up with a 50kw engine in a vastly larger space is completely irrelevant to his "problem".

There is no positive inlet or outlet. Engine boxes of his type are tight fitting and usually draw air from the bilge and no specific outlet. So they get hotter than your more spacious and positively vented compartment. However, provided the engine runs at its normal working temperature it should never be too hot.
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You are adressing a theoretical issue and telling him his system is fine. His PERCEPTION is that his system has too much heat in his engine compt and he has asked how to get rid of the heat! I have used my system as an example of how to get rid of heat . I am answereing his question, how to get rid of heat! I did this originally when I suggested using tumble drier ducting early on!
Stop digging!
Stu
 
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michaela said:
A hot issue!!

Thanks for all the comments guys. Very useful.
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This time of the year they have put their boats away, bored at home cooped up with family, lots of debate goes on plus a lot of willy waving, quite normal, me? Am on the big white bird waiting to take off from Cancun, was on a poser white sand beach a few hours ago!
 
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