Gasoline Diluted Oil Calculation

[bruce381]

IMHO
a few percent fuel is no big deal that said it WILL lower vis some BUT biggest problem would be emmison controls reading wrong info from motor oils and evap system
and PCV etc systems getting gunked up with coke/carbon.

Years ago rmenber GI base stock was/did have a lot of "light" ends like gasoline (sorta) that will effect oxidation and sludge/gunk more than anything.

Proper vis even with some Gasoline in it will still lube never heard of or do not think you can have cavation problems in a PC engine, flow volume and pressures to small/slow to do anything.

Flash can be a good way to see large amounts 3%-5%> or so of fuel but IR is much better.

bruce

 

[427Z06]

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...BUT biggest problem would be emmison controls reading wrong info from motor oils...

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Huh? Have you been blending your eggnog on the strong side again bruce?

 

[bruce381]

not emmision system expert BUT high amounts of volitle stuff like gas in oil WILL lead to faster gunking up of PVC and EVAP system in a engine, also O2 senesors may read rich from blow bye and mess up computer.
bruce

 

[427Z06]

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not emmision system expert BUT high amounts of volitle stuff like gas in oil WILL lead to faster gunking up of PVC

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You're good up to here.

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and EVAP system in a engine, also O2 senesors may read rich from blow bye and mess up computer.
bruce

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Forget this stuff.

 

[Eddie]

69=54 times

 

[427Z06]

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69=54 times

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In base 13, please.

 

[AEHaas]

I do not remember the article but an SAE paper said that fuel dilution (by itself) did not cause engine wear.

I agree that it may contribute to cavitation damage.

Look at these results and comment please:
http://members.rennlist.com/oil/test_results.htm

aehaas

 

[bruce381]

I still think a modern IC engine has bearings to small/supplied with low pressure oil to have any cavitation problems BUT I'm wrong a lot it seems.
from Federal Mogul components group:

"Another phennmena in bearing damage that is accelerated by THIN oil is cavitation erosion. Cavatation in bearing is best discribed as the collapse of vapor bubbles, prsent in the lube oil, due to pressure changes in the oil film. This collaapse results in rapid impingment of oil against ther soft bearing lining material causing erosion. Reducing
operating temperatures and using heavier weight oils will minimize this damage. Other steps found to minimize cavation damage are using harder bearing materials, reducing diametral clearance and INCREASING oil supply pressure."

Re learned something again that I forgot, from a seminar in 1990.
bruce

 

[Turbodriven]

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I do not remember the article but an SAE paper said that fuel dilution (by itself) did not cause engine wear.

I agree that it may contribute to cavitation damage.

Look at these results and comment please:
http://members.rennlist.com/oil/test_results.htm

aehaas

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Interesting reading that, thank you. Nice to know that a little bit of fuel does not mean the oil is not working. I can't help but think that the compression ring would not be happy with continuous over fuelling.

Poor 2741...looks like he has more copper in the oil than I have in my wallet

Not to mention 7112's results...that Chev is not in good shape

 

[Turbodriven]

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".... and using heavier weight oils will minimize this damage.."

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[427Z06]

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"Another phennmena in bearing damage that is accelerated by THIN oil is cavitation erosion. Cavatation in bearing is best discribed as the collapse of vapor bubbles, prsent in the lube oil, due to pressure changes in the oil film. This collaapse results in rapid impingment of oil against ther soft bearing lining material causing erosion. Reducing
operating temperatures and using heavier weight oils will minimize this damage. Other steps found to minimize cavation damage are using harder bearing materials, reducing diametral clearance and INCREASING oil supply pressure."

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I believe that may have be taken out of context. Maybe it should be read as "too thin of oil for the bearing clearances employed" since I haven't heard of cavitation problems in the bearings of racing engines for a long time. Current NASCAR engines are a good example of thin oil not causing cavitation problems.

 

[bruce381]

""Current NASCAR engines are a good example of thin oil not causing cavitation problems""

I agree think is a non issue or as stated above.

""harder bearing materials, reducing diametral clearance and INCREASING oil supply pressure.""

Would I think apply to a modern NASCAR engine.
bruce

 

[427Z06]

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""Current NASCAR engines are a good example of thin oil not causing cavitation problems""

I agree think is a non issue or as stated above.

""harder bearing materials, reducing diametral clearance and INCREASING oil supply pressure.""

Would I think apply to a modern NASCAR engine.
bruce

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The majority NASCAR engines don't have high oil pressures since their trying to eek out every last fraction of a horsepower. They count on extremely fine surface profiles, tight control of dimensions, tight clearances and thin oil.

 

[Turbodriven]

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The majority NASCAR engines don't have high oil pressures since their trying to eek out every last fraction of a horsepower. They count on extremely fine surface profiles, tight control of dimensions, tight clearances and thin oil.

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Any idea what viscosity oils they use? And Formula 1?