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  #1 (permalink)  
Old 07-07-2007, 08:20 PM
uscgrad's Avatar
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Question about driving over deep standing water

I live in Miami and from time to time water accumulates on the street when it rains hard. Yesterday I drove over an area of water maybe 6-8 inches deep (water didn't come up to the doors) I had no choice couldn't go around it...

Is there anyway this can cause damage to the car?
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Old 07-08-2007, 01:59 PM
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The primary danger of driving through standing water for most cars is the risk of sucking water into the intake tract, which will not compress if it reaches the combustion chamber and will destroy any engine. This is not a very big risk in a Cayman because of the location of the air intake. You would have to be is some insanely deep water to reach the intake.

There are however many other risks that are unique to the Cayman. Because the Cayman uses a horizontally opposed engine, the cylinder heads (and other parts of the engine) are much lower than in other cars. In fact, they are just above the bottom plane of the under body. If you submerge these, many bad things can happen. For one, water seepage will very likely stall the engine by robbing the spark from the spark plugs. But that's not going to cause permanent damage. Cooling a set of full temp heads instantly with cool water could cause warping or cracking, which would be very bad. Same holds true for the headers, which get really hot and if cooled instantly are very likely to crack.

With the low ride height and low engine placement, I would say just don't do it. Avoid standing water if at all possible.
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Last edited by Gator Bite; 07-08-2007 at 02:30 PM.
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Old 07-08-2007, 04:43 PM
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Driving over deep water.... not a problem.

Driving through deep water... much worse.

When I had an Elise I hit a rather deep puddle. The water caused no problem for the engine as the intake, like ours, is up high. But what did happen was the water was scooped into the intakes on the lower front of the car and created a waterfall from the ventilation system on to my feet... yummy.

Where do our front openings funnel water to?

GM
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Old 07-08-2007, 09:38 PM
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My cayman can go over water, I have special tires...LOL

You got me, I meant to say through a deep puddle...
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Old 07-09-2007, 01:11 PM
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Originally Posted by GeoMedic View Post
Driving over deep water.... not a problem.

Driving through deep water... much worse.

When I had an Elise I hit a rather deep puddle. The water caused no problem for the engine as the intake, like ours, is up high. But what did happen was the water was scooped into the intakes on the lower front of the car and created a waterfall from the ventilation system on to my feet... yummy.

Where do our front openings funnel water to?

GM
This happened to me many years ago, when I had a Jeep Wrangler. We had a torrential rain fall that flooded a few streets. Being the cocky show off kid that I was, I dropped my Wrangler into 4 wheel drive and went plunging into a flooded section that was covered by more than a foot of water. A tidal wave of water shot up and completely blasted the windshield. I couldn't see anything. But that also happens to be where the ventilation system gets it's air. I heard this weird noise (the slowing of the blower motor) and then suddenly, woosh..... Freezing cold water came shooting out of all the vents and completely drenched me. I was pissed for a second or two, then I couldn't help but laugh. Funny how showing off always backfires.

The front air scoops vent to the front brakes. No problem there. The Cayman ventilation system breathes from up high in front of the windshield.
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Old 07-09-2007, 04:00 PM
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For DEEP water (jeep, not cayman) be careful because the fan blade can get propellered into the readiators. we routinely ford water as deep as the height of out tires in our wrangler.

Greg
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Old 07-12-2007, 03:40 AM
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Beware the water

A buddy of mine drove through some 6" deep water and fried his 540i. the insurance co- State Farm- covered a reconditioned motor and he had to shell out another 3 grand for a new factory unit. His old motor had several expensive mods that he lost out on. If you can avoid it- don't do it. Real nightmare if it goes bad.
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Old 07-12-2007, 06:53 AM
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Originally Posted by Gator Bite View Post
This happened to me many years ago, when I had a Jeep Wrangler. We had a torrential rain fall that flooded a few streets. Being the cocky show off kid that I was, I dropped my Wrangler into 4 wheel drive and went plunging into a flooded section that was covered by more than a foot of water. A tidal wave of water shot up and completely blasted the windshield. I couldn't see anything. But that also happens to be where the ventilation system gets it's air. I heard this weird noise (the slowing of the blower motor) and then suddenly, woosh..... Freezing cold water came shooting out of all the vents and completely drenched me. I was pissed for a second or two, then I couldn't help but laugh. Funny how showing off always backfires.

I got caught in a monsoon / flash flood with my Jeep in north Scottsdale. It was so bad that there were portions of the road had been washed away and a couple police officers we standing in the road waving flares. Some of the road had washed away so much that a Mercedes had actually "run into" the road (imagine the front bumper being stopped by the dirt UNDER the road) The water was so deep that it started to come up thru the door seals on the bottom. Not a very fun situation.
Unfortuneatly, I found out later that someone didn't stop in time and hit one of the police officers waving the flare, killing him.
Moral of the story... Water + cars = bad stuff.
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