Car fires - root causes?
Car fires - root causes?
Author
Discussion

Scarletpimpofnel

Original Poster:

1,482 posts

48 months

Monday 16th October 2023
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This stat was posted on another forum "There are 100,000 car fires every year, and whilst most are started intentionally, something like 100 cars will catch fire every single day of their own accord".

It got me thinking what is the root cause of the 100 daily fires? Is it largely bad modifications, carrying fuel cans in the boot, smokers... or something else? Anyone got any stats or experience?

vikingaero

13,359 posts

199 months

Monday 16th October 2023
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Electrical gremlins, fuel line/rail faults spurting fuel onto hot engines/exhausts.

V8 Stang

4,509 posts

213 months

Monday 16th October 2023
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My S2000 caught fire after the oil filter came loose and pissed oil onto the exhaust manifold.

It does not take a lot to set a car on fire!

100SRV

2,372 posts

272 months

Monday 16th October 2023
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Brake fluid reservoir detaching in a collision and spilling on hot exhaust manifold.
Failure of PAS or oil cooler hose.

andy43

13,225 posts

284 months

Monday 16th October 2023
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TVR fuel hoses not getting on with high ethanol content fuels and hot exhaust manifolds is another good one.
Plus brake lines, clutch lines etc.

gt40steve

1,432 posts

134 months

Monday 16th October 2023
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A connecting rod through the block at high speed can release a big cloud of hot oil vapour which will readily ignite.

Ladvr6

180 posts

215 months

Monday 16th October 2023
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I’ve seen a car catch fire due to a wiring loom hanging free and eventually rubbed through the insulation and earthed to the body.

Only needed a zip tie or clip and it would have never of happened.

Old perished fuel lines, or lines placed next to a heat source is common.

I’ve seen people put big turbo’s on, remapped to run big power but they forget about all the stuff around it. It’s all good fun with 1xxxx horsepower but they forget when the turbo glows red it’ll melt everything around it.

soad

34,673 posts

206 months

Monday 16th October 2023
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Tend to be diesel vans on the M62 hard shoulder, or crashed Lamborghini’s.

AC43

13,626 posts

238 months

Monday 16th October 2023
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The battery on my BIL's Touran self-combusted and took whole car with it.

ian332isport

228 posts

261 months

Monday 16th October 2023
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AC43 said:
The battery on my BIL's Touran self-combusted and took whole car with it.
Bloody EV's wink

Scarletpimpofnel

Original Poster:

1,482 posts

48 months

Monday 16th October 2023
quotequote all
gt40steve said:
A connecting rod through the block at high speed can release a big cloud of hot oil vapour which will readily ignite.
Haha bad luck... clearly speaking from a bad experience!

gt40steve

1,432 posts

134 months

Monday 16th October 2023
quotequote all
Scarletpimpofnel said:
gt40steve said:
A connecting rod through the block at high speed can release a big cloud of hot oil vapour which will readily ignite.
Haha bad luck... clearly speaking from a bad experience!
Luckily not my car !

Rod200SX

8,176 posts

206 months

Monday 16th October 2023
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I can see how it happens just from random oddity part failures. Remember a few years back I was at my mums when she got dropped off by my aunt and uncle in their VW toureg thing. Only a couple years old but distinct smell of petrol. Had a nosey under the bonnet and line going to injectors had a failure/rubbed on something and was creating a fine jet of petrol being sprayed across the engine bay. Very luckily it didn't go up but just needed a bit of that fuel going to the wrong part of the engine bay and it could have ignited.

Things fail, it's just part of life but unfortunately cars have lots of very flammable things that make them work! In a way I'm surprised it isn't more common.

gt40steve

1,432 posts

134 months

Monday 16th October 2023
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Even some antifreeze can vapourise & burn. Usually a brief flash though unlike oil which 'gets going' so that the high temperature ignites the liquid oil aswell as the vapour.


Krikkit

27,938 posts

211 months

Monday 16th October 2023
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gt40steve said:
Even some antifreeze can vapourise & burn. Usually a brief flash though unlike oil which 'gets going' so that the high temperature ignites the liquid oil aswell as the vapour.
Only if you fall for the marketing rubbish about Evans coolant, give yourself a double-boost and don't use it.

ric19

88 posts

148 months

Monday 16th October 2023
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People go on about Petrol in fires, but years ago I had a Renault 12 and the float in the carb snapped off and petrol was pouring onto the exhaust manifold.. did it catch fire, no it just turned to white smoke thankfully.. from what I have read Petrol and Diesel flashpoints are too high to be set alight by hot metal, A flame yes, but Brake Fluid is another matter.

oldagepensioner

562 posts

58 months

Monday 16th October 2023
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Ladvr6 said:
I’ve seen a car catch fire due to a wiring loom hanging free and eventually rubbed through the insulation and earthed to the body.

Only needed a zip tie or clip and it would have never of happened.

Old perished fuel lines, or lines placed next to a heat source is common.

I’ve seen people put big turbo’s on, remapped to run big power but they forget about all the stuff around it. It’s all good fun with 1xxxx horsepower but they forget when the turbo glows red it’ll melt everything around it.
The wiring thing happened to my brothers Xsara Picasso.To make them RHD they have to have a cross shaft from the brake pedal to the master cylinder.The wiring is strapped to the bulkhead above and became detached and chafed through catching fire.

Scarletpimpofnel

Original Poster:

1,482 posts

48 months

Tuesday 17th October 2023
quotequote all
ric19 said:
People go on about Petrol in fires, but years ago I had a Renault 12 and the float in the carb snapped off and petrol was pouring onto the exhaust manifold.. did it catch fire, no it just turned to white smoke thankfully.. from what I have read Petrol and Diesel flashpoints are too high to be set alight by hot metal, A flame yes, but Brake Fluid is another matter.
I can't even imagine how that failure mode (snapped float) could happen!

Scarletpimpofnel

Original Poster:

1,482 posts

48 months

Tuesday 17th October 2023
quotequote all
Rod200SX said:
...

Things fail, it's just part of life but unfortunately cars have lots of very flammable things that make them work! In a way I'm surprised it isn't more common.
Reading this thread I tend to agree with you.

As an 18 year old I drove to the coast and could smell petrol very strongly. When I got there I found my petrol can had tipped over in the boot and mostly leaked out with petrol sloshing around the boot. It was a hot day so I just left it to evaporate away then drove the 70 miles home with the stench and some still slopping around. Luckily I wasn't a smoker. I was extrememly unaware of risks as a youth.

ric19

88 posts

148 months

Tuesday 17th October 2023
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Scarletpimpofnel said:
I can't even imagine how that failure mode (snapped float) could happen!
You know I have often thought the same, it seems unlikely but it definitely did, it was like the metal had been bent back and forward to weaken it then reinstalled in the carb, like a ticking time bomb