How can this be ! ?
You are correct. At the front of the cam is a thrust plate that stops the cam from walking forwards. The roller cam has flat lobes. There is no thrust forwards or backwards do to the lobes angle. There is however, room for it to move very slightly fore & aft. This motion is (mildly?) controlled by the timing gears and chain.
As the thrust plate is installed, the fuel pump eccentric is bolted to the cam gear holding the cam gear on the cams nose. The chain will provide some limitations in code and aft movement. As I push and tug on my set up, I can get no movement. There is no mic on it ether.
This boils down to how much flex is in the cam retainer plate while torqued down at spec. (35 ft/lbs)
There should be none really.
You are correct. At the front of the cam is a thrust plate that stops the cam from walking forwards. The roller cam has flat lobes. There is no thrust forwards or backwards do to the lobes angle. There is however, room for it to move very slightly fore & aft. This motion is (mildly?) controlled by the timing gears and chain.
As the thrust plate is installed, the fuel pump eccentric is bolted to the cam gear holding the cam gear on the cams nose. The chain will provide some limitations in code and aft movement. As I push and tug on my set up, I can get no movement. There is no mic on it ether.
This boils down to how much flex is in the cam retainer plate while torqued down at spec. (35 ft/lbs)
There should be none really.
