Originally Posted By: OVERK1LL
Originally Posted By: HangerHarley
Originally Posted By: typ901
The Rod looks different as well...
I digress they look a LOT the same, and the lighting on the older Piston is dark on the area with the words. I can not tell a difference between those two except that they are orientated differently, the one has the words facing "up" the other "to the side."
Maybe some engines from 1999 to 2003/2004 dont have slap on the 5.3 because the Pistons arent all that different?
Im thinking an analysis of WHY PS develops is in order, since it appears to be a random thing, and engines in fleets w same engines and oil, some develop it and some dont.
Might make a case for driving habits? Should those with the heavier foot use the thicker Oil?
You need to take a closer look. There is a BLACK COATING on the piston skirt on the 2nd piston, and the one I just posted above. This is the "updated" design. The skirts are coated in Teflon (common in the aftermarket, and Ford has been using it for a long time in the Modular engines) which helps to reduce or eliminate the noise caused by piston slap. It is also low-friction, so it apparently has an emissions benefit as well.
I would not have known that. One piston looks "Cleaner," namely, the second one. (I also dont have the trained eye.. those pistons looked super same. Im not the expert, though, and i dont doubt what you are saying.)
Also, RE Dupont's Teflon: So they took it out of Oil, but its still on Pistons? And i thought they were coated with "Molybdenium Disulfide," or Mos2..............
Having had an Engine drop a valve once and me looking high and low and in years-old warehouses for ANY Piston, i can tell you pistons from different years probably are NOT interchangeable.
Originally Posted By: HangerHarley
Originally Posted By: typ901
The Rod looks different as well...
I digress they look a LOT the same, and the lighting on the older Piston is dark on the area with the words. I can not tell a difference between those two except that they are orientated differently, the one has the words facing "up" the other "to the side."
Maybe some engines from 1999 to 2003/2004 dont have slap on the 5.3 because the Pistons arent all that different?
Im thinking an analysis of WHY PS develops is in order, since it appears to be a random thing, and engines in fleets w same engines and oil, some develop it and some dont.
Might make a case for driving habits? Should those with the heavier foot use the thicker Oil?
You need to take a closer look. There is a BLACK COATING on the piston skirt on the 2nd piston, and the one I just posted above. This is the "updated" design. The skirts are coated in Teflon (common in the aftermarket, and Ford has been using it for a long time in the Modular engines) which helps to reduce or eliminate the noise caused by piston slap. It is also low-friction, so it apparently has an emissions benefit as well.
I would not have known that. One piston looks "Cleaner," namely, the second one. (I also dont have the trained eye.. those pistons looked super same. Im not the expert, though, and i dont doubt what you are saying.)
Also, RE Dupont's Teflon: So they took it out of Oil, but its still on Pistons? And i thought they were coated with "Molybdenium Disulfide," or Mos2..............
Having had an Engine drop a valve once and me looking high and low and in years-old warehouses for ANY Piston, i can tell you pistons from different years probably are NOT interchangeable.