What causes the smoke?

1629 Views 8 Replies 6 Participants Last post by kerrynzl, Jun 13, 2011

W123

Discussion Starter · Jun 12, 2011

Okay, I ran out of fuel today on the way to work but luckily, I keep a small auto parts store in the trunk of my car. Soooooo, I tossed in about a gallon and a half of new 10w 30 oil and finished the drive. The fuel filter was a nice golden color, showing that I had pure oil in the lines but I had absolutely NO smoke. None. None at idle, none while driving, and none when I floored it.

Now, my car smokes on anything, especially straight D2. Why didnt it smoke today on pure oil?

Im thinking it bought some nicotine patches.

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kerrynzl

· #3 · Jun 12, 2011

W123 said:
Okay, I ran out of fuel today on the way to work but luckily, I keep a small auto parts store in the trunk of my car. Soooooo, I tossed in about a gallon and a half of new 10w 30 oil and finished the drive. The fuel filter was a nice golden color, showing that I had pure oil in the lines but I had absolutely NO smoke. None. None at idle, none while driving, and none when I floored it.

Now, my car smokes on anything, especially straight D2. Why didnt it smoke today on pure oil?

Im thinking it bought some nicotine patches.

Was the new 10w30 oil blended with gasoline?
Usually white smoke is caused by lower combustion temperatures and the main culprit is fuel starvation.

The most common WMO used is 15w40 which would be slightly more restrictive at the filter.
There are other issues like fuel atomisation that rear their ugly head on W85.
The first thing we do is blame the oil, because logically it went away when you changed the oil.
All the issues I've had looked like a fuel problem , but they were existing long before the WMO was ever used.

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kerrynzl

· #7 · Jun 12, 2011

tweener said:
no...what this guy is saying is that he Burnt BRAND NEW MOTOR OIL in his diesel.....and it DID NOT SMOKE!

so he is trying to figure out whay that is, when his car smokes on D2!!

Before you guys flame me, We are all guessing on the internet with incomplete information supplied
Please look at this logically.

He is comparing CLEAN OIL with CLEAN DIESEL !
It smokes on Diesel but not on Oil [ we are assuming its white smoke, because we never complain of black smoke ]

It is running colder combustion on Diesel than on Oil
Oil has a higher heat value [ BTU ] than diesel for the same volume

I am GUESSING that there is a slight fuel restriction for both fuels, but the higher heat value of oil is saving the combustion temps dropping off.
The fuel filter is probably on the "tippy toe" edge of plugging.

If he put a new filter on this vehicle [or a helper lift pump] it will "probably" run fine on diesel , but black smoke a lot more on oil.

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kerrynzl

· #9 · Jun 13, 2011

Try advancing the IP a tad.

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