Teacups, I can only guess at what was braking the pump lobe set screws. Maybe the cracks in the impeller caused some sort of flexing/loading/unloading that generated torsional energy which transferred through the crank-cam gears-oil pump gears/lobes and stress/shock loaded the oil pump lobe...
Thanks for all the input! I found that the Dyno Brake Impeller had a few hair line cracks. After replacing the brake impeller the vibration data lowered and there has been no issues after 6 sprint car motors have been dyno tested.
patprimer, I believe the timing cover is CNC'd for the oil pump mounting, aligned the best it can from the CNC-ing. The cover is located by the timing cover locater pins. Yes the blocks are line bored.
One thing I did not mention is that the Dailey pumps brake where another "stronger"...
Thanks for everybody's input so far. I am checking with the engine dyno tester for some answers to your questions. The oil pump is mounted to the front of the timing cover, inline with the cam, driven from the cam gear. The timing set is gears NOT a belt or chain. The picture/link of the oil...
When dyno testing SBC sprint car motors on a Superflow X test dyno we are breaking the cam driven Dailey Engineering engine oil pump. It can happen on the first or second pull. The allen head screws break that hold the drive gear on the lobe and locks up the pump. Sprint car motors do not run a...
