Lubricants_Improving Fuel Efficiency-Legacy Vehicl

[Shannow]

https://www.energy.gov/sites/prod/files/2014/03/f8/deer11_fenske.pdf

 

[spasm3]

I found the chart on page 15 interesting

 

[Shannow]

Yes, big ends aren't supplied lubricant for their full 360 degrees of movement, so while hydrodynamic typically reigns, there is a bit "squeeze film" effect as the load is applied on the firing stroke.

For e.g.


This one is interesting in that it shows standard operation of an engine (grey line), and what happens in de-activated cylinders and those still in service...

 

[spasm3]

I once rebuilt a small block ford 302. I noticed the front main bearing seemed to be worn more than the others. It fired on 1 then 5. So 2 cylinders loading the front bearing first.

( firing order 1 5 4 2 6 3 7 8 )

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8

 

[OneEyeJack]

Page 12 shows an increase in FEI going from a 10w-30 to a 5w-30. Interesting.

 

[Cujet]

Quote: Use of low-viscosity lubricants, while effective in reducing fuel
consumption, will increase contact severity

Originally Posted By: spasm3

I found the chart on page 15 interesting


Agreed. It's something we've known for some time now. Thin oils and heavily loaded bearings don't go together well.

 

[Linctex]

Originally Posted By: spasm3

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8 )


Smallblock Chevy 350 is the same but mirror image