Transmission Fluids

Reply Subscribe

Thread Tools

Search this Thread

Oct 14, 2007 | 07:01 PM

#31

dcara

Thread Starter

Tuned

Joined: Aug 2003

Posts: 278

Likes: 0

Thanks folks. What are these rep points and how do I find out the rules (if any) regarding them.

Oct 15, 2007 | 02:45 AM

#32

Kwikkordead

Fleet Owner

Joined: Jun 2004

Posts: 25,090

Likes: 1,112

From: Rio Rico, AZ.

Quote:

Originally Posted by dcara

Thanks folks. What are these rep points and how do I find out the rules (if any) regarding them.

See the little scale on the upper right corner of this post?
Click on it.

Oct 16, 2007 | 03:09 AM

#33

Mach1

Senior User

Joined: Jul 2003

Posts: 491

Likes: 2

From: Spicewood, TX.

Mark/Doug, Doesn't the Mercon spec have a range for the co of fric? The mercon spec is a minimum spec? there is still a range that the fluid must meet to be certified..

Mark, the differential that you saw drop 20 degrees had to be either the Synthetic fluid had a different viscosity or the syn was slipperier, On a straight gear box it is very apparent..the differences between the Dino and Syn. Friction Modifier...

Doug, excellent discussion and homework brought in...You/Mark have me thinking..But, I am just a tech, with hands on experience. Not an Engineer.

Oct 16, 2007 | 07:45 AM

#34

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

All trans fluid specs have a range for coeffienct of friction. They don't want it too low or frictions will slip, and they don't want it too high because the shifts will be too harsh. It must be within the range or it isn't issued a license.

Oct 17, 2007 | 01:43 AM

#35

Mach1

Senior User

Joined: Jul 2003

Posts: 491

Likes: 2

From: Spicewood, TX.

If there is a range, then the C of Frics would/could be different?

Then some fluids would be more slippery then others???

Oct 17, 2007 | 05:13 AM

#36

dcara

Thread Starter

Tuned

Joined: Aug 2003

Posts: 278

Likes: 0

All specs typically have some window of acceptance. Typically plus or minus some number of the units of measurement, or plus or minus some percentage. Although, I haven't seen the actual Mercon spec yet.

I have continued researching other tranny fluids and vistied many web sites of companies that develop various automotive oils just because I find the subject interesting right now; and also hopeing to stumble across a copy of the actual Mercon spec. One of the things I've read is that there are additives called frictional/viscosity modifiers that can be used in organic (dino) oils that can give them some of the characteristics of a synthetic. However, in some cases these additives can lead to clutch shudder during shifting under certain loads and or temperature conditions which may mean the mixture exceeded the spec limits somewhere under thhose operating condition.

Last edited by dcara; Oct 17, 2007 at 05:16 AM.

Oct 17, 2007 | 07:20 AM

#37

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by Mach1

If there is a range, then the C of Frics would/could be different?

Then some fluids would be more slippery then others???

Yes, that's possible. It is also possible that if you buy Brand X it's at the low end of the range, and 6 months later when you buy the same fluid it's now at the high end of the range.

In production it's impossible to make every part or batch exactly the same. That's true for fluids and for hard parts. Everything has a max and a min, it's called tolerances.

Oct 21, 2007 | 07:53 PM

#38

Mach1

Senior User

Joined: Jul 2003

Posts: 491

Likes: 2

From: Spicewood, TX.

Dcara, could the slipping/shudder be caused by too much Friction modifier( I will not make mention of slipperiness here) in the blend? This is what I have been talking about all along..Too low c of fric and they will slip...