2019 summer race.... Jadaharabi vs 318willrun
This is more directed at 318 than anybody else but you're all welcome to look at it. This is a comparison of the bearings on the pinions on the 742 and the 489 housings.
Notice that the size of the bearings on the 742 are bigger than the bearings on the 489 pinion.
The 489 pinion inner bearing is physically in diameter bigger by an eighth of an inch but the 742 is physically wider and has more rollers on the inner bearing.
The front pinion bearing on the 742 is much larger than the 489. By the way the 489 front pinion bearing is the same part number for the 741 pinion.
The one on top in the picture is of course the 489 pinion and it is wearing a crush sleeve Eliminator.
This is more directed at 318 than anybody else but you're all welcome to look at it. This is a comparison of the bearings on the pinions on the 742 and the 489 housings.
Notice that the size of the bearings on the 742 are bigger than the bearings on the 489 pinion.
The 489 pinion inner bearing is physically in diameter bigger by an eighth of an inch but the 742 is physically wider and has more rollers on the inner bearing.
The front pinion bearing on the 742 is much larger than the 489. By the way the 489 front pinion bearing is the same part number for the 741 pinion.
The one on top in the picture is of course the 489 pinion and it is wearing a crush sleeve Eliminator.