Bob the oil guy website guidlines

[TXBLU]

Just remember the golden rule of fluid dynamics;
Pressure and flow (volume) are inversely proportional.
High pressure = low volume.
Low pressure = high volume.

Eric

[zrayr]

Originally Posted by TXBLU

Just remember the golden rule of fluid dynamics;
Pressure and flow (volume) are inversely proportional.
High pressure = low volume.
Low pressure = high volume.

Eric

don't take that to any extreme. In a Ford engine low pressure is more a result of excessive clearances than any other cause.

Z.

[madmaxx]

What is the justification for 0w40 recommendation being BS, viscosity at 30F is THICKER than 10W30?

at 90F 10W30 is 92cst and Ow40 is 102cst so OW40 is thicker than 10W30 at lower and higher temperatures.

[Ant]

YOUR QUOTE:
5) 99% of the population should be using 0w20, and the other 0W30. He recommends no 20W50 etc. He said in an older engine you might want to use Mobil 1 0W40 to compensate for wear and it has higher phosphorous and zinc level than other oils. 1,000 and 1100 respectively.

No exactly BS, He did say might want to use, but a lot of engine builders who also race their product tend to stick to certain viscosities with mainly V8 engines designed in the 1960's, that of course doesnt mean you cant reduce startup wear with a 0w-40 oil and of course if that oil does the job hot and also has the right makeup of additives for flat tappet camshafts then no problem.

Castrol and several other oil companies make specific oils for old technology engines, they tend to be 20w50 or thicker, I guess this takes into account fuel polution etc contaminating and diluting the oil so in race engines start off thicker......! For road use Mobil 1 0w-40 might be great but reading the applications for the 0w grades the oil manufacturer specifies these grades for modern small engines and larger engines the heavier grades.

I am still not sure what to exactly use as this car is going to be road driven as well, and like a lot of others on this forum I would prefer to see Schaeffer make a 10w50 as I think 20w oil is too thick when cold, hence I will heat first in colder climates.

[vector1]

changing my oil out and think i am going to use mobil 1 delvac 1300, 15w40. diesel engine oil.

[Mark IV]

Originally Posted by vector1

changing my oil out and think i am going to use mobil 1 delvac 1300, 15w40. diesel engine oil.

Oil intended for diesels generally have lower rates of "anti foam" additive due to the generally lower RPM ranges of the engines. I would be wary of twisting 7000 RPM with oil designed for a max of 2500. The windage at double the RPMs, despite a windage tray must be substantial. Just saying.......

[Ant]

Originally Posted by Mark IV

Oil intended for diesels generally have lower rates of "anti foam" additive due to the generally lower RPM ranges of the engines. I would be wary of twisting 7000 RPM with oil designed for a max of 2500. The windage at double the RPMs, despite a windage tray must be substantial. Just saying.......

Delo 400 is designed for gasoline performance engines as well as diesel.
I will be switching on to Schaeffer 705 when I have done some miles in this car, I know of several people who race with Delo 400 in smaller engines, and have read good right ups from people in the US with speedway engines that swear by it.

[Bob In Ct]

Eric:
Where did you get that? Who decided that high pressure = low volume? Should we now get into a discussion of "Reynold's Number" as it pertains to oil flow in an internal combustion engine?

How about "Lower Viscosity = Higher Flow", "Higher Viscosity = Reduced Flow".

Bob

[madmaxx]

I found some interesting information on oil pressure, if you oil pressure drops across the entire range of operation from new it is worn main bearings, if it is good at lower rpms and drops off at higher rpms it indicates worn connecting rod bearings. The reason being centrifugal force. At 6000 rpms it is equivalent to the rod bearing spinning 165mph around a 1.5"? circle. WOW!!!!

[madmaxx]

Oh, the most valuable information I found is ALWAYS VERFIY GAUGE READINGS with a second gauge!!!!!!!!!

[Bob In Ct]

Hey MM:
Assuming a 4 inch stroke the bearing are traveling 12.57 inches per revolution (pi X d). This is 6,283 feet per minute at 6,000 RPM. That works out to about 71 MPH (not 165). The amazing part to me is that at 6,000 RPM the pistons are going up and down 100 times per second.

Bob

[madmaxx]

I got the value off the article, I thought 71mph was like 5000 rpm. Needless to say there are forces working that may not be obvious at first.

Originally Posted by Bob In Ct

Hey MM:
Assuming a 4 inch stroke the bearing are traveling 12.57 inches per revolution (pi X d). This is 6,283 feet per minute at 6,000 RPM. That works out to about 71 MPH (not 165). The amazing part to me is that at 6,000 RPM the pistons are going up and down 100 times per second.

Bob