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Old 08-06-2015, 08:06   #1
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Boat: Morgan Outisland 41'
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Engine room heat

I have a Morgan Outisland 41. My inline blower just failed and I'm about to replace it. The engine compartment is enclosed. The vents are both high on the engine compartment.

I was wondering if putting two inline blowers, one in and one for out vent would offer a better advantage to just the out vent? If I had two blowers, would I put too much air in and cause the engine room air to leak out into the cabin area?

Is there a formula for the size of an inline blower cfs so as not to create a negative pressure in the engine compartment with too high of cfs on an exhaust fan?

Thanks, Michael

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Old 08-06-2015, 08:26   #2
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Re: Engine room heat

My guess is it's fine as designed, why change it?
My other guess is that maybe in theory you could over pressurize the engine compt and leak hot air into the cabin if the engine was off, but not when it was running, it pulls quite a bit of air itself.
Third guess is that a bilge blower just isn't capable of pulling a significant vacuum

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Old 08-06-2015, 08:28   #3
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Re: Engine room heat

Don't you have another thread going on this topic? If it wasn't you it was a very similar question so perhaps look for a current thread on the topic. Use the google custom search box under the search button.
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Old 08-06-2015, 08:36   #4
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Re: Engine room heat

Caterpillar has a good application guide on Diesel Engine Room Ventilation:

See also Yanmar Help, for additional information on the subject:
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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