Diesels aren't very sensitive to back pressure. Some Diesels can even run submerged for short periods so long as the fuel doesn't get contaminated and the intake doesn't ingest water. Ever see a hummer with a snorkel? ( A Real Hummer ).

Now if you ingest a sizable amount of water into a diesel its game over. High compression ratios and water don't mix.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

It is actually an OPEL/NISSAN/RENAULT van. They come with 1.9 and 2.2 CDI engines...

Problem with that is the water is not like a metal plate. Our engines can make up to 30psi in the exhaust manifold on a daily basis so a few inches of water over the tailpipe won't make any difference.

Fill a glass with water, put a straw into it and blow in the straw. My money bets that you can blow bubbles out the bottom of the straw. Same idea with the exhaust.

I agree, keep in mind that one foot of water submergence only results in about 0.4 psig of pressure.

Thats how an agent I know blew the engine in her S430. Ran it through a deep puddle, water got sucked in, rods bent. $20k later all was good.

Talk to the tech's on the other forums, they see that happen after any storm that causes flooding. It doesn't take much water at all to hydrolock and ruin an engine.


As for the exhuast back pressure thats not possible. Your head would be far under water before the pressure of the water killed the engine. Lots of marine engines discharge pretty far underwater. Heck an Alpha 1 drive is probably about a foot and a half sitting at the dock, maybe more.

The bottom line is these are not boats or off road trucks, don't treat them as such. Just because you got lucky once doesn't mean its not a problem. Again ask Gilly or any of the tech's how many MB's they see roll in with hydrolocked engines.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

mouthfull of water in the intake= aqualock and thrown rods? funny guys though, the british. imagine they almost ruled the planet at some point

I'll bet that I can take any of them through 14" of standing water and none of them will suffer any water ingestion or hydrolock.

It's very simple to do.........you travel at no faster than 1'/sec and don't cause any splash.

I just saw a totaled 92 E420 with a bent rod (they think) in a shop in DFW. The guys who were replacing my alternator had one towed in after someone drove it into deep water (plenty of flash floods in TX this week). The interior was also flooded (it still had water inside the doors), so it must have been pretty deep. The intake was full of water and the engine was locked up. They were waiting for the insurance company to come get it.

Well the problem is that most people hit that much water at like 20mph, then you have a nice bow wave...

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Even at 5 mph........you're toast.........