what is dripping from my exhaust box

RLJ

I have a leak in my exhaust box where it was repaired. What drips out? Is this just moisture, not petrol anyway is it? It drops out when I come in and park. Would appreciate help

peasant

condensation, that's all it is

(if it were indeed petrol, your engine would most likely run like a sack of nuts, if at all)

RLJ

peasant wrote: »

condensation, that's all it is

(if it were indeed petrol, your engine would most likely run like a sack of nuts, if at all)

Thanks will condensation still be there a couple of hours after driving

peasant

shouldn't really as after a long drive the whole exhaust should be way too hot for anything to condensate (that would include petrol )

RLJ

peasant wrote: »

shouldn't really as after a long drive the whole exhaust should be way too hot for anything to condensate (that would include petrol )

So what is dropping? When i came in at lunchtime after short drive to shops it was dripping all after noon?

peasant

After a short drive that would probably be normal.

Ever noticed on some cars after they drive off, like several cupfulls of water come out of the actual exhaust pipe. As that is usually quite high over the bottom of the box, I would suspect that given the right circumstances you could actually have a liter (or more) of condensated water in your back box.

Let that drip through a small hole and it would drip for a while.

Next time put some vessel under the drip and investigate

RLJ

peasant wrote: »

After a short drive that would probably be normal.

Ever noticed on some cars after they drive off, like several cupfulls of water come out of the actual exhaust pipe. As that is usually quite high over the bottom of the box, I would suspect that given the right circumstances you could actually have a liter (or more) of condensated water in your back box.

Let that drip through a small hole and it would drip for a while.

Next time put some vessel under the drip and investigate

;)OK many thanks;)

mumhaabu

This is water from Catalytic Converter nothing to worry about at all. A Catalytic Converter takes the nasties from the exhaust fumes and turns them into water using a process similar to how Hydrogen Fuel cells work. There is Platinum (white gold) inside the converter and this is what does the scrubbing of the pollutants from the exhaust fumes.

Lucifer

For every litre of petrol used, almost a litre of water is produced. Most of this is not seem as it is steam rather than water but while the exhaust is still cold you will see some drips from condensation on the cold exhaust. After the exhaust heats up fully, you should only see a very small amount drip out.

Its nothing to worry about really, but it is why so many cars with small mileage doing short runs all the time end up needing exhausts replaced. If the exhaust doesnt get hot enough to get rid of all the condensation inside it, it will just stay there and rust the exhaust. If this is happening all the time it will shorten the life of the exhaust.