Blowers for a diesel - SailNet Community
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post #1 of 21 Old 10-09-2013 Thread Starter
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Blowers for a diesel

I have a 86 Pearson 39 that i have been slowly rehabbing. I am trying to clear away some of the clutter and straighten out lazarettes etc. I have noticed that the boat has blowers located in the aft lazarette and near the engine compartment. The boat has the original Westerbeke 46. When it comes to diesels I am a novice but I thought blowers were only needed for gas engines? Is this necessary? Thanks
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post #2 of 21 Old 10-09-2013
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Re: Blowers for a diesel

A blower gives you more horsepower for the weight. However heavier engines are more dependable, and a blower also reduces the life expectancy of the engine.

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post #3 of 21 Old 10-09-2013
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Re: Blowers for a diesel

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A blower gives you more horsepower for the weight. However heavier engines are more dependable, and a blower also reduces the life expectancy of the engine.
I don't think he means a supercharger or turbocharger. He is talking about a ventilation blower.

Yeah, my diesel has them, too. Even though, I don't think there is much danger of an explosion from diesel fumes.

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post #4 of 21 Old 10-09-2013
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Re: Blowers for a diesel

You don't need then on a diesel.

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post #5 of 21 Old 10-09-2013
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Re: Blowers for a diesel

However.... having a blower that runs while you run (and ideally another 10 minutes or so) will go a long way to reducing any residual 'odour' after running, and remove some residual heat in summer.

A friend's 2001 Beneteau in the tropics has a blower that stops and starts with the 'ignition' switch. I'm thinking of putting one in even though I have eliminated all leaks and odour is not an issue, heat can be in summer.

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post #6 of 21 Old 10-09-2013
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Re: Blowers for a diesel

What Faster said, while not needed for safety like a gas engine, it will remove excessive heat. During a hot summer day you may appreciate running it for several minutes after shut down. Helps circulate some fresh air which the engine would benefit from as well

I have one to remove heat primarily because I have a battery bank nearby.

I know a few sailors whom didn't know they had blowers till several years of ownership

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post #7 of 21 Old 10-09-2013 Thread Starter
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Re: Blowers for a diesel

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I don't think he means a supercharger or turbocharger. He is talking about a ventilation blower.

Yeah, my diesel has them, too. Even though, I don't think there is much danger of an explosion from diesel fumes.
Yes, thanks I should have been more specific, they are for ventilation. There is quite a bit of the flex duct in the compartments. Also the blower does not come on with ignition but rather its own switch on the breaker panel.
I look forward to cleaning that all out.
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post #8 of 21 Old 10-09-2013 Thread Starter
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Re: Blowers for a diesel

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What Faster said, while not needed for safety like a gas engine, it will remove excessive heat. During a hot summer day you may appreciate running it for several minutes after shut down. Helps circulate some fresh air which the engine would benefit from as well

I have one to remove heat primarily because I have a battery bank nearby.

I know a few sailors whom didn't know they had blowers till several years of ownership
I am going to be taking the boat to So. Florida next year so maybe I will rethink the removal. Thank you
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post #9 of 21 Old 10-09-2013
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Re: Blowers for a diesel

FWIW...when I re-powered I replaced the 30 year old blower, when I did...I didn't put any vent hose on it since its high in the engine room and heat rises, I didn't see the point?

Of course on a gas engine where the fumes are heavier then air and your trying to exhaust the fumes you need to run the flex vent hose low in the bilge

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post #10 of 21 Old 10-09-2013
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Re: Blowers for a diesel

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Originally Posted by dszerlag View Post
I have a 86 Pearson 39 that i have been slowly rehabbing. I am trying to clear away some of the clutter and straighten out lazarettes etc. I have noticed that the boat has blowers located in the aft lazarette and near the engine compartment. The boat has the original Westerbeke 46. When it comes to diesels I am a novice but I thought blowers were only needed for gas engines? Is this necessary? Thanks
If there are two, one will be for exhaust, connected to a vent tube that is positioned near the high point in the engine compartment, to remove hot air. The second will blow relatively cooler outside ambient air into a vent tube (or several connected to one another at a plenum) that terminate near the bottom of the engine compartment. The cooler the air that the engine intakes, the more efficient the engine and the cooler it runs. The vent blowers do make quite a difference as others have noted, above.

FWIW...
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