WOW what was wrong with this Bus

[Bad340fish]

Today I saw a city bus smoking like no other engine I have ever seen! The bus was coming over a small hill and I could see the smokecloud before the bus came over the hill. It was a ash grey color and there was LOTS of it. You could literaly not see the entire 4 lane road behind the bus, and it just hung there didn't seem to move. Cars were actualy stopping in the opposite lane from the bus. I guess it was a combo of lots of black smoke(one of the newer city buses around here though) and anitifreeze or something? Wish I had a camera with me lol

Clark

 

[MCummings]

If I remember right from a post from Joe Donnelly (soory if I spell name wrong).



Gray smoke is unburned fuel, usually from the timing being wayyy off, or, very coldcombustion chamber temperatures. Also I think with severely low compression gray smoke is a possible thing.

The bus could have had bad rings, causing severe blow-by, and low-compression. (But I am talking using my own brain for reasoning,, WATCHOUT! lol)



Black smoke, is partially burned fuel, and Blue smoke, is, burned Motor oil.

White smoke, is usually water. but can be caused by a cold motor changing Water inside Exhaust systems, Intake, Turbo etc. into A steam, or Vapor.



My one fry short of a happy meal explanation...



MerrickNJr

 

[Ray Torresdal]

smoke

If you have bearings go out on the turbo, you can pump lots of smoke, as well as oil out the stack. When it happened to me, years ago with a 1674TA CAT, it took a gallon or 2 of oil every 40 miles. Not only smoked, but oil ran down the back of the cab when we got to a CAT dealer in Scottsbluff, NE.



Ray