Dirtman
Former Middleweight Moss Fighting Champion
- Joined
- May 28, 2018
- Messages
- 19,304
- Reaction score
- 13,326
- Points
- 113
- Location
- 41N 75W
- Vehicle Year
- 2009
- Engine Type
- 2.3 (4 Cylinder)
- Transmission
- Automatic
- 2WD / 4WD
- 2WD
- Total Lift
- It's up there.
- Total Drop
- It's down there.
- Tire Size
- Round.
- My credo
- I poop in the furnace.
But what modern engines still use flat tappet cams? It was my understanding this stuff is like leaded gasoline and valve seats. Nothing made today has soft enough valve seats to need lead protection. It's all for old engines that have never been upgraded.ZDDP is still needed for flat tappet cams, the zinc and phosphate were removed because if an engine with a cat burns oil with those additives it will poison the cat. I have heard that a fully broken in flat tappet cam will live without zinc but why risk it when the additive is so cheap compared to a ground up cam and metal throughout the engine?
And I remember a TSB from ford recommending the use of lubeguard to prevent a shudder issue.