Originally Posted By: 69GTX
Appreciate the response, though I guess I will remain confused on this topic. A few posts above you stated that ATF's have no FM's for synchronizers....though I would suspect they must have some for bearings/gears. And years back you stated that "friction modification" is the new term for "friction reduction." So did something change in how my 1999 T56 synchronizers function with or without FM's in the ATF? Aren't the paper lined synchronizers similar to the wet clutches/friction material in a typical automatic transmission, that is friction modified? My 2002 Lincoln transaxle runs on Mercon V, a friction modified fluid. I can see where CVT's might be something new for FMs. But not the same old automatic and manual transmissions using.
Earlier post on FMs
Ok, nothing has changed so let me restate it a differently:
Friction Modification in Tribological terms means we can
increase friction (as in traction coefficient modifiers for CVT's),
lower friction, or
modify it dynamically (as in relative motion between spinning parts).
There are Friction Modifiers in CVT fluid that increases the traction coefficient.
There are Friction Modifiers in ATF and MTF fluids that
dynamically change the Friction Coefficient as spinning parts engage and disengage.
In engine lubricants, there is a friction modifier that reduces the Friction Coefficient between sliding and rotating parts.
What I was saying above was that in "street talk" people use the term FM as it applies to engine oils as in
friction reduction in engine oils. Just because we use the term FM in engine oils doesn't mean we can apply the same meaning in all areas of friction modification.
So again, Friction Modification in Tribological terms means we can increase friction (as in traction coefficient modifiers for CVT's), lower friction as in engine oils, or modify it dynamically (as in relative motion between spinning parts in At's and MT's).
What I said above was:
Quote:
In ATF's you have specific friction modifiers that modify friction dynamically for wet clutch discs and steel clutch plates.
In MTF's you have a different type of friction modifier that modify friction dynamically for the synchro's.
There are different friction modifier chemistries for engine lubricants, differential gear lubes, ATF's, Hydraulic Fluids, and MTF's.
What I stated earlier was this:
Quote:
ATF has 1/3 the AW chemistry of a dedicated MTF
and no special friction modifiers for the synchronizer assembly. So yes, there is a great difference in additives.
I never said ATF doesn't have friction modifiers; I said ATF has no special friction modifiers for the synchronizer assembly.
I also stated:
Quote:
So yes, there is a great difference in additives.
I also explained that that there are different friction modifier chemestries for each type of fluid for each application.
SO, let's get the correct concept of Friction Modification correct as it applies to Tribology before ask other questions.
