white smoke
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Senior User
Joined: Jul 2006
Posts: 202
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From: Hamburg PA
white smoke
hi guys,
after my previous thread and realizing i could afford the turbo at the moment i decided to open up the exhaust. while trying to hear the sound with various differnt pieces i had a friend of mine in the truck tapping the accelerator. right after start-up a tap sends a puff of white smoke until the truck warms up. is this the injectors or return lines? or is it something completely different?
thanks guys,
keith
after my previous thread and realizing i could afford the turbo at the moment i decided to open up the exhaust. while trying to hear the sound with various differnt pieces i had a friend of mine in the truck tapping the accelerator. right after start-up a tap sends a puff of white smoke until the truck warms up. is this the injectors or return lines? or is it something completely different?
thanks guys,
keith
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
If the engine is cold, that white smoke is unburnt fuel.
Diesel fuel auto ignites at about 475 degrees.
If the engine is cold, you only have one compression stroke to raise the air temp from the outside temp to 475 just to make the engine run.
Untill the engine has warmed up, part of the fuel is not burnt since the cylinder walls, head and piston are soaking up the heat needed to ignite the fuel.
When we start several pieces of equipment in the winter, it looks like a fog bank over the equipment.
But the fog smells like raw diesel fuel.
After the engines run for a couple minutes, the white goes away as does the raw fuel smell.
Nothing strange about it, that is just the nature of a diesel.
It is also why many big diesels that have to sit outside are always running in the winter.
If you turn it off and the engine gets cold, you may not get it started again.
Diesel fuel auto ignites at about 475 degrees.
If the engine is cold, you only have one compression stroke to raise the air temp from the outside temp to 475 just to make the engine run.
Untill the engine has warmed up, part of the fuel is not burnt since the cylinder walls, head and piston are soaking up the heat needed to ignite the fuel.
When we start several pieces of equipment in the winter, it looks like a fog bank over the equipment.
But the fog smells like raw diesel fuel.
After the engines run for a couple minutes, the white goes away as does the raw fuel smell.
Nothing strange about it, that is just the nature of a diesel.
It is also why many big diesels that have to sit outside are always running in the winter.
If you turn it off and the engine gets cold, you may not get it started again.
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