Basic concepts about oil

The Oily Bits S1 Specific Topics
1

Hi

The oil is one of the most important parts of an engine, in addition to its use or its power.

When we talk about oil, we always make reference to its viscosity and almost always we chose the oil about this basis.

We believe that an oil 10/60W be better than a 10/40W, but we are quite right?

Yes and no, because it not only affects the viscosity of oil in the protection of our engine, other much factors less known also influence.

An oil 5/30W will give us more power in the engine that a 10/60W, because of its viscosity, as the friction between moving parts, will be less.

But we can also get 3 or 4 HP more if instead of being the oil the maximum, is at a minimum.

Normally between the maximum and minimum are more or less 1 liter of difference and that makes our crank, hits with less mass, increase those HP mentioned, but attention, it is often dangerous.

A higher viscosity oil, give more pressure our pump and more protecion our engine.

Factors less known are its oil viscosity index, which depends on the formulation with the that has been made the oil and additives.

In the oil viscosity index is what we really we need know, to determine the quality of the oil.

This index is measured in the laboratory into two phases, oil at 40 degrees and 100 degrees.

The higher the viscosity index of these measures, the greater the protecion of the engine, not only by the pressure of the pump, also by the ability of lubrication according to the density of the oil at these grades.

Another factor is the density index, similarly measured in the laboratory, as in the case mentioned above, the higher its density, the longer it will be protected parts of the engine between boot and boot.

And finally the boiling point, the higher, the lower their risk of disintegrating Synthetic or mineral composition.

I advise Castrol TWS 10/60W or Castrol Edge 10/60W.

Of all the oil analyzed, it is the best meets all of these requirements and also the engine Rover K series has hydraulic followers, how higher the viscosity index, less HP Lose, this is why when the cam hits against follower to open or close valves, making them download less of oil in the follower hydraulic, getting more open valves.

Regards

2

Exige S1 = VHPD = Solid lifters

3

Andy - can’t believe you read all that, and if you did it made any sense…

4

Andy - can’t believe you read all that, and if you did it made any sense…

I read a lot of reports …

5

Hi

Yes, but that does not change anything for mech followers, is same performance impressive of this oil.

I know, because most engines that I made for competition, has mech followers.

The problem is more with the hydraulic followers that with the mech followers, which is why I made this comment considering this.

With this post, let me just clarify that there is in the oil in a number of important issues before choosing one for our engine, apart the viscosity(10w/60 or 5w/50)which is what most of us do not support for the buying and who are these:

—Viscosity Index; base oil and formulation including additives, which is made with oil.


—Density Index; the higher the index, increased protection between boot and boot, because the layer of oil continues deposited is more and takes longer to drain.


—Boiling Point; a larger point, the less danger of disintegrating oil, mineral or synthetic.

You can see these two comparative tables and get yourselves by your own conclusions.

CASTROL EDGE 10W60


Test Method(s) Unit Typical
Relative Density 15�C ASTM D4052 (0.864)
Appearance Visual Clear & Bright
Viscosity 100�C ASTM D445 mm�/s (24.2)
Viscosity 40�C ASTM D445 mm�/s (161)
Viscosity Index ASTM D2270 (179)
Flash Point, PMCC ASTM D93 �C (200)
Pour Point ASTM D97 �C (-51)

MOTUL 300 COMPETITION 15W/50


Test Method(s) Unit Typical
Relative Density 15�C ASTM D4052 (0.883)
Appearance Visual Clear & Bright
Viscosity 100�C ASTM D445 mm�/s (17.8)
Viscosity 40�C ASTM D445 mm�/s (128.1)
Viscosity Index ASTM D2270 (154)
Flash Point, PMCC ASTM D92 �C (215)
Pour Point ASTM D97 �C (-36)


Regards

6

Interesting read…

http://www.opieoils.co.uk/pdfs/10w-60.doc

and others at Opie Oils Technical Info

7

Hi Toby

Is an interesting site and said some things with which I agree, but others are not.

There is more friction of the pieces moving against oil, that is true, but not there is a greater attrition, quite the opposite and I tell you why I think this.

The more thick layer of oil has several advantages:

– Higher oil pressure in the circuit.

– Lower risk of breaking heat by engine, by degree of protection.

– Less wear fricion because of the thick layer more protective.

– Minor unloading of hydraulic followers.

And the disadvantage could be the some lost by HP friction of the crank against the oil.

But this can be overcome in 2 ways:

– Putting a dry sump.

– Make counterweights in the crank arrow.

When we talk about an engine, either for competition or for track days, we have to choose between reliability or the loss of those 4 or 5 Hp by the thickness of the oil, if in your engine lacks of the pieces mencioned above.

This oil Castrol Edge 10W/60 is formulated especially for BMW M3, M5 and Z8.

This gives us a clear idea of the quality of the oil and the destination to which it is targeted.

I will speak from my experience for the competition.

If you to do very short races of 10 or 15 minutes, you can put an oil more fluid to win those 4 or 5 more HP, but for long-term races requires a denser oil, for the security and the protection of the engine.

Regards

8

Hi

This post deals with guidance on oil, as many people thought that 10W/60 that has to be more dense than a 15W/50 and sometimes happens that is not so.

We must seen the viscosity index that shows the thickness of the oil and each has its oil viscosity index, and if compare two oils 15W/50 sure that each has a different index, and next to the flash point and the density point is really important within an oil.

Regards