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Old 12-06-2010, 06:18 PM
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Exhaust moisture

Just curious if any one has any ideas on what could cause the passenger side exhaust to have as much moisture as it does. Its not extreme, but when you fire it up cold I'll notice a little more moisture than the driver side with a few little drips. Enough to see a difference, but once it warms up it's gone. I've checked the oil for water. I don't believe it's the head gasket. Not sure if theres a problem. Any ideas? It runs great! No overheating issues! Not sure what to think.

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Old 12-06-2010, 06:23 PM
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Its not a problem.....an engine puts out lots of moisture. If its an older engine, it has a heat riser valve on the passenger side to aid warm up, so it seems more prevalent on that side
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Old 12-06-2010, 08:21 PM
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My 406 and a friends 383 that I did for him both have more condensation on one side than the other. Another friens 355 is the same way. Seems to just be a normal occurrence.
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Old 12-06-2010, 08:40 PM
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Good to hear that! Started to get a little worried! It runs great though and go's away after warm up. I guess all is good.Thanks for the replies.
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Old 12-07-2010, 06:37 AM
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moisture

As I remember for every gallon of gasoline you burn you produce 1.2 gallons of water, The hydrogen in the fuel combines with the oxygen in the air, once the engine warms up it comes out the tailpipe as higher temperaature vapor, at start up the moisture condenses in the cold exhaust system so you see the droplets
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Old 12-07-2010, 09:06 AM
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Cracks me up when southerners see a little condensation coming out of the exhaust they freak out. You ought to come up north where it freeze's in the exhaust over night and blows steam out for an hour when it's 10* outside.
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Old 12-07-2010, 10:09 AM
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I was just a little concerned with it because of the diffrence in the two. I do know what you mean with people down here freaking out over it. I was a little concerned because of the one side doing a lot more than the other side. My Thundra does it all day that's how I know it's running. lol
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Old 12-07-2010, 03:28 PM
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Quote:
Originally Posted by 396chevelle
I was just a little concerned with it because of the diffrence in the two. I do know what you mean with people down here freaking out over it. I was a little concerned because of the one side doing a lot more than the other side. My Thundra does it all day that's how I know it's running. lol
Every street dual exhaust set up I've ever seen where there is a crossover seems to favor one side over the other. Certainly on factory set ups with a heat riser valve on one side you'd expect to see that since the valve forces one sides exhaust thru the intake manifold hot spot crossover for a faster warm up and better on choke fuel vaporization.

But even systems without the heat riser valve seem to favor one side, it must be there is that much difference in resistance to flow in one of the sides that more flow takes one out let, or maybe it's an effect of firing order where most V8s fire two cylinders on one side only 90 degrees apart.

Beyond that attempted explanation, it beats me as to why.

Bogie
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Old 12-07-2010, 04:58 PM
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Something that I have noticed during 38 years of driving is that which ever side is lower then the other when the car is parked the night before, will steam the most. That stated as long as there is no heat riser in the mix. I have noticed this with headers and dual exhaust over the years.
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