The sign says flood

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Captain Jack
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Re: The sign says flood

Post by Captain Jack » Wed Jul 18, 2012 2:06 pm

Hah, I drove up to a flooded road but half-way in when I couldn't see the line marks, I chickened out and reversed... remember Trem1's story.

Still, it seems that only petrol engines seem to drown. Where IS the air intake? I think it's somewhere behind the front bumper but not exactly sure. I could always cut the thing off higher up to avoid this.
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2003 - 2008: 1998 Peugeot 406 2.1 TD 110bhp LX Saloon
2008 - 2009: 2004 Honda Accord 2.2 CDTI 136bhp Executive Saloon
2009 - 2013: 2002 Peugeot 406 2.0 HDI 110bhp Executive Saloon
2013 - ????: 2007 Peugeot 407 2.2 HDI 170bhp Executive Saloon (mapped to 213bhp :twisted:)

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steve_earwig
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Re: The sign says flood

Post by steve_earwig » Wed Jul 18, 2012 3:34 pm

Driving on water? http://youtu.be/4oeJjzdlTuI

I'm sure someone posted some shots from Service Box a few years back. Basically there's one pipe from the bottom of the air filter to over the chassis rail where it joins the pipe that's behind the l/h bumper. There's a few different ones but they're like a big flexible sock affair that curls up and face inwards or backwards and should be a far way up. I remember mjb's one had collapsed and was basically sucking dirt off the inner wing. Presumably at speed there's a fair bit of water under there and there's a good chance of some of it ending up in the pipe - particularly if it's collapsed.

The pipe between the filter and the sock does unclip :wink:
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Bailes1992
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Re: The sign says flood

Post by Bailes1992 » Wed Jul 18, 2012 5:48 pm

If a diesel engine has it's intake above the water it can run submerged!
Damaged gets done when it sucks up water and tried to compress it.

Looks like he got off lucky!
Saying that I drove through a few fords in both of my Peugeots no issues!
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Re: The sign says flood

Post by scotty73 » Wed Jul 18, 2012 5:53 pm

Bailes1992 wrote: Saying that I drove through a few fords in both of my Peugeots no issues!
And even after that you bought a mondeo? :lol: :lol:
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Re: The sign says flood

Post by D9406 » Thu Jul 19, 2012 11:04 am

An update.
It all seems OK and he is one lucky lad. I dropped the oil out and changed the filter the following morning and it came out looking the right colour, it had only been changed @2K ago, no grey streaks and nothing untoward on the dipstick or bottom of filler cap. Whilst underneath the car I took a look at the air intake set up. There is a solid pipe from the bottom of the air box to behind the front bumper with the opening level with the bottom of the front bumpers skirt. He said he had only gone in on tick over but as soon as the water was deep enough to cover the intakes opening it just hoovered up the water, filled the airbox and then the cylinders. I assume that as soon as hydraulic lock occurred there was not enough flywheel momentum to compress the water and bend the conrods, it just stalled the engine. At least he didn't try and restart it. Luckily the 90's don't have intercoolers otherwise that would have been filled also.
So HDi owners, do we avoid water more than 6" deep or modify the intakes. I assume the intake is placed in order to take advantage of cool, dense air but it does look a little vunerable. Your thoughts please.
1999 406 HDi 2.0 110 GTX Estate. 48k when bought, now 126K. Second owner.
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steve_earwig
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Re: The sign says flood

Post by steve_earwig » Thu Jul 19, 2012 1:54 pm

When we've discussed this before the plan was to drill small holes in the link pipe so it's got another source if the end of the pipe goes underwater. Oddly enough when I took the link pipe off my D9 I noticed it already had a few holes in it, possibly for this reason. I'd still prefer to 'ave it orf if there was any chance of a ducking.

Also, as you point out, gunning the engine as you go through the water in the traditional manner is a complete no-no because it greatly increases the chance of bent conrods etc.

It would be nice to have a permanent solution, these after-market air filters that replace the complete air filter would reduce the chance of it happening, although there is the drawback of sucking hot air from around the engine. Or there's that Nivek scoop thing they're all fitting over on the coupe club.
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Re: The sign says flood

Post by Welly » Thu Jul 19, 2012 4:58 pm

Just thinking, the water would have hit the turbo charger first, it might not have got that much further at least not a full-bore intake flood. It may simply have cut out through lack of oxygen and possibly a snuffed-out combustion stroke.
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Bailes1992
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Re: The sign says flood

Post by Bailes1992 » Thu Jul 19, 2012 5:56 pm

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S'what I did to my first 406. Would solve any issues.
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Re: The sign says flood

Post by steve_earwig » Thu Jul 19, 2012 8:44 pm

Apart from the breathing hot air from around the engine one...
Unskilled meddling sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - It's alive!!

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Bailes1992
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Re: The sign says flood

Post by Bailes1992 » Thu Jul 19, 2012 8:47 pm

steve_earwig wrote:Apart from the breathing hot air from around the engine one...
I never noticed any heatsoak at all! I think you would be hard pressed to notice a difference on an intercooled diesel.
I used to thrash the tits off of that 406, and it was tuned and never had any heatsoak problems what so ever!
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Re: The sign says flood

Post by D9406 » Thu Jul 19, 2012 10:35 pm

Welly wrote:Just thinking, the water would have hit the turbo charger first, it might not have got that much further at least not a full-bore intake flood. It may simply have cut out through lack of oxygen and possibly a snuffed-out combustion stroke.
Quite possibly. It did a passable imitation of a multi jet fountain when it was cranked over without it's glow plugs, although some of the water would be what was in the intake pipes.
1999 406 HDi 2.0 110 GTX Estate. 48k when bought, now 126K. Second owner.
Clutch changed @110k, bottom pulley changed, cam belt changed, EGR blanked.

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