I Understand that when your truck is "rolling coal" it is because you are not burning all the fuel. When i am putting my truck under load, it black smokes and then clears up pretty quick. So my question i think is a simple one, How bad is it for these motors to be black smoking or running ritch? is it enough fuel to wash out my cylinders? can i do this and not worry because it is fun to spool up and shoot people with soot, but i don't want to damage my motor.....i run good oil and change it frequently so i think i am fine but wanted everyones opinion.

 

yer not hurtin it...........when the boost pressure hits the combustion chamber is when the air to fuel ratio is correct to allow for a clean burn.

black soot out the stack is definatly unburnt fuel and yes the soot does collect in the oil as suspended particals but they are smaller than 2 micron so they just squeeze thru everywhere and eventually end up being drained out in the oil with yer regular changes, as long as yer oil is up to operating temps the oil flashes of and raw fuel that is in the oil so a washed cylender doesnt apply here, the only time a washed cylender is possible is during long idle periods where the oil is at lower pressure and wont flash off as well

 

good to know, I love my cummins and don't want to hurt it hahaha

 

i always would wait for my thermostat to pop before getting over 20psi or rolling heavy coal just for safety purposes, didnt matter mutch becasue i scored the cylander and burnt a pistin

 

your going to need ALOT of fuel before you wash the rings down in a diesel, like insane amounts.....nothing a stock or slightly worked pump can even come close to doing......

 

thats basicaly what i figured, but better safe than sorry.....

 

cylinder wash is usually related to low combustion/cooling/oil temps which is very common for an engine thats idling low for long periods of time.

When your rolling coal, combustion temps are fairly warm and quickly skyrocket once the turbo lights

 

GOOD so i can keep up the black smoke. its fun to go through town and smoke out asswipes from my town.

 

fun, till you get a ticket for it