i have seen some cars that water drops down from there muffler today i saw that my car does the same why does it do this???

This is the wrong forum for such a question. To answer it, however, it's what a catalytic converter does; converts harmful chemicals into harmless chemicals. Water is one of these chemicals.

thanks also if too much comes out does it mean anything

Its just condensation.

Sometimes unburnt fuel..

Those responses are not exactly correct. In perfect combustion we take Gasoline (HC) Hydro carbons and add (O2) Oxygen and (N2) Nitrogen (Which is along for the ride). Therefore we get HC + O2 + N2 = H2O + CO2 + N2, more or less. In Fact you produce about 1 gallon of water for every gallon of Gas you burn. The water released is typically as vapor however through condensation into colder exhaust pipes you will change Water Vapor into liquid water hence the drip. Now we don’t have perfect combustion and that is where the catalytic converter comes in. It is basically an afterburner for exhaust gasses. The catalytic converter gets really hot and encourages further combustion of most Monoxides into dioxides which are less toxic and don’t contribute to smog etc.

The water released is typically as vapor however through condensation into colder exhaust pipes you will change Water Vapor into liquid water hence the drip.

Its just condensation.

:thumbsup:

A chemical reaction occurs in your muffler where hydrogen hits oxygen and well H20 = water. So yeah, more or less condensation like they said.

A chemical reaction occurs in your muffler where hydrogen hits oxygen and well H20 = water. So yeah, more or less condensation like they said.

Sorry dude. The Hydrogen atoms are part of a longer chain of atoms in the Hydro carbon molecule. We do not have loose hydrogen atoms floating around in our mufflers. There is a very very very small chance a loose hydrogen atom could theoretically get out of the combustion chamber but would bond with a loose O2 atom at the very latest by the catalytic converter (afterburner). The only vehicle that currently BURNS Hydrogen as opposed to a hydrogen fuel cell (which produces electricity) is a BMW test vehicle called the H2R. During combustion (in the combustion chamber not in the muffler I hope) the long chain of hydrocarbon atoms gets mixed with O2 under temperature and pressure (this is called combustion). The resulting compounds (theory) are H20 (Water) and C02 (carbon dioxide) the atmospheric nitrogen is just along for the ride.

Water is a product of combustion and is completely normal.

All properly tuned vehicles do it.