blowby

[lonestar16]

i was just wondering what does blowby mean i keep seeing ppl talking about it but not sure what it does or mean..does all truck have some blowby some good some bad..just trying to learn all that i can..thanks

[pearce trucking]

Combustion of fuel air mixture occurs in the combustion chamber. The piston rings are in contact with the cylinder liner to seal the heat energy released during combustion and force the piston downward. Blowby is when some of the combustion escapes between the rings and the liner and into the crankcase beyond, thereby releasing some of the energy that would otherwise be used to force the piston downward. If you remove your oil filler cap, you will see a small amount of crankcase gasses escaping. Some small amount is acceptable, but not much.

[lonestar16]

ok thank just trying to get a better understanding on how everything works and what to look at