Water dripping from exhaust

I've got a 93 VFR 750 that appears to be dripping water from the exhaust. It a slow drip that only lasts for about 15-20 minutes and the total amount of water is relatively small (@ 1 or 2 Tablespoons)

This mainly seems to occur when the bike has been sitting for more than a week and then warmed up and immediately shut off. The bike is always garage kept and I never ride it in the rain. The picture shows where the leak is coming from but of course if I rev the engine up you can see a few droplets being spit out of the back of the exhaust. What could be causing this water to accumulate in the exhaust? The weather has been very mild lately here in Georgia and since the bike is garage kept I am doubtful this is related to the climate or storage conditions.

Regards,
Rollin

 

condensation from warm air mixing with cool air causing the formation of H2o. Normal, unless you have a blown head gasket.

 

does it smoke at all?

 

The bike would be blowing white smoke and the coolant level would drop if it had a blown head gasket. it's just condensation, nothing to worry about. The condensation is a byproduct of the combustion process. Once the engine and exhaust is up to operating temperature, the temperature of the components does not allow the steam coming from the combustion process to recondense, and thus it is blown out the exhaust. That's why it only lasts a few minutes. I could elaborate, but I was accused of giving people headaches in the dyno thread.....

 

When I was working on it this morning the garage was filled with smoke. I'm pretty sure however that this was coming from the bong and not the bike :biggrin:

Just kidding....That would be illegal

I did an oil change this morning and checked all fluids and everything looked normal. I guess all I need to figure out is why the exhaust is leaking from under the bike.

Regards,
Rollin

 

My bike does that too, especially if I start it on a cold morning. I can see tiny little water droplets shoot out the exhaust in the 1st minute or so the bike is running. As long as the vapors disappear the bike is fine. Even in the service manual it states that condensation is normal and it's normal to get a little white vapor from the exhaust when it first starts up.

 

I understand about condensation but the thing that I have a problem with that the dripping starts after cutting the engine off after running it for a good ten minutes. I would have thought that after 10 minutes the bike would have warmed up enough to burn off most of the condensation and water.

Regards,
Rollin

 

Hey guys check out my Storage Advice in (VFR General Discussions) it can help keep the condensation problem away! Plus it's not a good idea to start the bike up once a week during storage! Thus you won't have a problem with condesation! But you will have to allow the condensation in your pipe dry out so it doesn't stay there and cause rust! Take the exhaust off and allow it to dry out in the house in a warm place then re-install it!

 

The combustion is a chemical reaction combining fuel and oxygen to produce heat and
combustion products. Stoichiometric combustion conditions are those where the relative
fuel and air quantities are the theoretical minimum needed to produce complete
combustion. Atmospheric air contains 21% oxygen by volume and is the most
convenient O2 source.

Water vapor and carbon dioxide as well as nitrogen oxides, sulfur oxides and hydrogen
chloride are typically products of combustion. Hydrogen chloride, HCl, comes from the
combustion of chlorides (salt dust), nitrogen oxides, NOx, are a typical by-product of
combustion air, and sulfur oxides, SOx, comes from the oxidation of the sulfur present
at very low concentrations as odourant compounds added to natural gas.
While sulfur dioxide is recognized as a pollutant, it is not itself a source of trouble in
furnaces, boilers and chimneys. But when sulfur dioxide is further oxidized to sulfur
trioxide material problems may develop.
Sulfur dioxide and nitrogen oxides, NOx, are toxic acid gases which readily react with
the water in the atmosphere to form a mixture of sulfuric acid, nitric acid and nitrous
acid.

Condensation of these reaction products occurs on surfaces which temperature are
below the dew point of the gas mixture and yields an acidic solution This dilute solution
of these acids result in a far greater acidity than normal (i.e. a lower pH) which could
lead to corrosion (cf. Figure 2.1). In fact, the condensate becomes increasingly
corrosive after it is concentrated by repeated condensation and evaporation

 

I have found that when explaining a simple natural occurrence in scientific terms, the reaction to the explanation can become exponentially unequal to the size of the original occurrence. The End.

 

SLover.

I knew that. I was just waiting for someone else to explain.....

 

It's normal and Honda even put a small 3mm hole on the underside of the silencer front end so that the water can drip out.

You will be surprised at just how much moisture there is in the air, particularly in winter.

 

suds

Can slo explain how to get beer to come out pipe?:biggrin:

 

the flow of a viscous fluid through a pipe with helical shape parameterized with View the MathML source, where the small parameter var epsilon stands for the distance between two coils of the helix. The pipe has small cross-section of size var epsilon. Using the asymptotic analysis of the microscopic flow described by the Navier–Stokes system, with respect to the small parameter var epsilon that tends to zero, we find the effective fluid flow described by an explicit formula of the Poisseuile type including a small distorsion due to the particular geometry of the pipe.

 

beer

NO, NO.....For light beer.

 

yodasmile If the oil is not milky looking, the coolant level is in the same place, and no white smoke when idle, then don't worry about it. Like the guys say, it's normal, even the cars do it.

 

But Slo. What happens if you mix an arguably drier American air with mositer colder Canadian Air and the ultra dry and hot Mexican air? This I believe is in direct contravention of the NAFTA. There are sacntions to deal with this problem which if acted upon, will prevent the Arpiture of the starter motor from rusting as a result of this water escape. Do you agree?

 

Rollin,Honda VFR Intercepters are excellent,all-around,go-anywhere,do-it-all road machines,they're not supposed to be used as aquatic vehicles. Stop driving "Pearl" around underwater like that,it would be a shame to ruin a beautiful old machine that way! :tongue:LOL!:biggrin: Seriously though,if it's JUST water coming from the tail pipe Rollin,don't be too concerned that's definitely condensation build-up. My Ducati does that exact same thing,and that's a little air-cooled twin engine in that bike.

 

you could get one of these I suppose. If it doesnt work, you could sell it on eBay as a "marital aid"

Helix Muffler Plug - Motorcycle Superstore

 

here is a "less sexual" one
Twin Air Exhaust Plug Large 4-stroke at BikeBandit.com

also a "more sexual" one for those of you that are into that