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Engine bay fire extinguishers

Joined
8 Sep 2019
Messages
70
Location
UK
Hi all,

I am looking to fit a fire extinguisher in my engine bay but I am in a bit of a dilema.

Is it best to have an automatic extinguisher at a certain temperature OR a manual pull chord one? For the pull chord, is there a simple modification that can be done to any extinguisher?
Also, where is the optimal place to put the extinguisher?

I have a Jeanneau Merry Fisher 805.

Thank you!
 

seastoke

Well-known member
Joined
16 Mar 2013
Messages
8,517
Location
boat conwy
Hi all,

I am looking to fit a fire extinguisher in my engine bay but I am in a bit of a dilema.

Is it best to have an automatic extinguisher at a certain temperature OR a manual pull chord one? For the pull chord, is there a simple modification that can be done to any extinguisher?
Also, where is the optimal place to put the extinguisher?

I have a Jeanneau Merry Fisher 805.

Thank you!
Automatic it’s to late when you need to pull and you might not be able to access , what if it’s at night . Or if you see a bit of smoke you might lift the engine hatch in you will be introducing air to help the fan the fire
 

fred247

Active member
Joined
17 Aug 2016
Messages
164
Location
East Coast UK
Automatic fm200 large enough to fill the engine bay space total volume as if the engine isn't there. placed as near to a likely heat source as possible, common place if room above the engine on under side of engine hatch, engine heat will not discharge it but fire will. Do not use dry powder will ruin the engine
 

jamie langstone

Active member
Joined
22 Dec 2013
Messages
489
I have a MF805 and I placed an auto one in the engine bay on the port side . There is also a hole in the bulkhead to fire extinguisher in the storage hatch at the back facing the engine . There should be a black cap/plug that you pull out to poke the extinguisher in. I would never open the engine hatch if you suspect you have a fire .
 

superheat6k

Well-known member
Joined
10 Jan 2012
Messages
6,041
Location
South Coast
Most auto fire extinguishers work by a glass bulb melting. A stiff wire loop around the glass bulb wil easily trigger the thing, just make sure you don't trip on the wire !
 

Jamie Dundee

Well-known member
Joined
24 Jul 2019
Messages
1,212
I put a Fireblitz 2kg in my Antares 760, in my case it was a condition of insurance that there must be a fully auto extinguisher in the engine compartment.
64545419-007A-4762-B59A-DADC1E31F3AC.png89623EA0-72AC-4D8A-A7B8-B8AEBF06BFA3.jpeg
 

DavidJ

Well-known member
Joined
15 Jun 2001
Messages
4,667
Location
home Brum, boat Costa Brava
I put a Fireblitz 2kg in my Antares 760, in my case it was a condition of insurance that there must be a fully auto extinguisher in the engine compartment.
View attachment 109698View attachment 109699
That looks really neat (and a good price) and a lovely clean engine as well by the way.
It looks quite small from the picture. Did you reference any specification for volume.
I edit
Ive just looked at the data sheet and it says a floor area of 2 sq M but no volume spec. Do you have any more info.
Maybe perfect for single engine (as long as your insurers don’t want manual activation as well) but not for twin engine space because you can’t double up.
 
Last edited:

Mr Googler

Well-known member
Joined
11 Apr 2008
Messages
3,877
On a serious note.....by putting it there.....if you had a fire at full chatt.....wouldn’t all the agent just get sucked into the engine And perhaps not put out the fire?
 

Jamie Dundee

Well-known member
Joined
24 Jul 2019
Messages
1,212
could have cleaned up your engine bay before taking a picture 😳🤣🤣
I’m looking for someone around 4stone and 4’ tall I can shove in head first with some polish. 6’ and 16 stone don’t really work in that space 🤬🤬
 

Jamie Dundee

Well-known member
Joined
24 Jul 2019
Messages
1,212
That looks really neat (and a good price) and a lovely clean engine as well by the way.
It looks quite small from the picture. Did you reference any specification for volume.
It’s the biggest they do in that range, specified for 3.4cum which should be ok. They do warn not to use two extinguishers in the same space.
B874F744-D4C6-4B0C-A009-9F34014396F3.png
 

Jamie Dundee

Well-known member
Joined
24 Jul 2019
Messages
1,212
On a serious note.....by putting it there.....if you had a fire at full chatt.....wouldn’t all the agent just get sucked into the engine And perhaps not put out the fire?
At least it would stop the engine! I’m more worried about not being able to close off the 6 vents feeding in from outside.
 

BruceK

Well-known member
Joined
8 Feb 2015
Messages
7,519
Location
Conwy
Fire at sea is my biggest fear. Been there and done that on a ship that was gutted on shelter and mezzanine decks.

I have two Gaseous auto extinguishers in the engine bay. 1 is redundant and these on top of a Halon fire suppression system that is still armed and ok but I cant dispose of. My battery banks have a dedicated powder extinguisher and my diesel heater has a dedicated powder fire extinguisher. The cockpit has a portable unit and there are two more portables for the cabins. The galley has a extinguisher and fire blanket.
I have 3 smoke and infrared alarms along the boat.

It may seem overkill, but have you ever seen the gusto with which a GRP boat can burn?
 

BruceK

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Joined
8 Feb 2015
Messages
7,519
Location
Conwy
On a serious note.....by putting it there.....if you had a fire at full chatt.....wouldn’t all the agent just get sucked into the engine And perhaps not put out the fire?
Highly unlikely. Your engine would stall immediately
 
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