engine bay fan

[yoda]

After sorting out the power supply and successfully getting the current fan running I have found that the existing fan is VERY noisy. I am looking for a quiet engine room fan, capacity is not a big issue but noise is. Any recommendations gratefully received.
Cheers, Yoda

 

[simonfraser]

if the purpose of the fan is to get the petrol fumes out of the bilge, does it need to be on all the time ?
as your engine constantly removes air from the compartment too ?

 

[coopec]

An engine room fan is for heat dissipation and to suck air from outside the engine room for the motor's combustion. (You would need a fairly substantial blower to do that)

Haven't you got the engine room enclosed? Maybe you should be looking for some sound deadening material?

 

[vyv_cox]

I have a computer fan blowing air across the battery box into the engine room. Very quiet but maybe not big enough for you?

 

[coopec]

Surely these fans are not too noisy?

Of course (say) a 2 liter motor needs a lot of air per minute when running at 2500rpm

 

[coopec]

I have a computer fan blowing air across the battery box into the engine room. Very quiet but maybe not big enough for you?

My engine room is completely sealed (to limit noise) If I didn't have decent fans the motor would die.

Engine Design Calculator Air requirement

 

[Supertramp]

I was advised to run the fan before starting to remove any gas build up (hydrogen or hopefully not propane). After that it's function is to cool by feeding clean air in and removing warm air. On my boat this is ventilated out by the helm position providing welcome warmth and also giving an early warning if anything overheats or combusts.

Like Yoda, mine is sometimes very noisy and i am interested in a replacement. Although not too quiet or I'll leave it on by mistake.

 

[ashtead]

We can really only hear ours when engine switches off and fan keeps running for a couple of minutes - not certain of make but a standard fitment on Moody and I suspect Hanse -Yoda -are you a Hanse as contacting the owners forum might give some suggestions for a make of fan used.

 

[Plum]

An engine room fan is for heat dissipation and to suck air from outside the engine room for the motor's combustion. (You would need a fairly substantial blower to do that)

Yes, if the engine compartment is sealed and the only air going in is via what is being blown in by the fan then unless that fan can deliver 1000 litres of air per minute it will not keep up with the demand from the engine and may therefore create a resistance to flow.

www.solocoastalsailing.co.uk

 

[yoda]

We can really only hear ours when engine switches off and fan keeps running for a couple of minutes - not certain of make but a standard fitment on Moody and I suspect Hanse -Yoda -are you a Hanse as contacting the owners forum might give some suggestions for a make of fan used.

Yes Hanse 370 and I will try the owners forum but I was just looking for a make that is reasonably quiet because there is quite a few to choose from.

 

[SimonKNZ]

Yoda, just wear better ear defenders when you're in there doing rounds. You marine engineers, always making things complicated

 

[Graham_Wright]

I don't think I would have a problem with fan noise emission with my engine!