I've read somewhere about someone suspecting a wrist pin, and the symptoms were the same. The noise on de-celeration, and prominent at 2500 RPM.
Take a long 3/8" extension and place it on top the cam sensor and hold the extension to your ear. If you can here a dink dink dink sound through it, there is play in the sensor and the drive.
Stethascope might help...
Could be rocker arm components cracked?
How about the timng tensioner/ loose chain..?
Bad lifter?
I've heard of wrist pins installed without the retainers. I've also heard engine builders poo-poo this like it's no big deal...
I've also heard of ruining a block that way....
Sorry to hear of this. Hope you locate the problem.
Take a long 3/8" extension and place it on top the cam sensor and hold the extension to your ear. If you can here a dink dink dink sound through it, there is play in the sensor and the drive.
Stethascope might help...
Could be rocker arm components cracked?
How about the timng tensioner/ loose chain..?
Bad lifter?
I've heard of wrist pins installed without the retainers. I've also heard engine builders poo-poo this like it's no big deal...
I've also heard of ruining a block that way....
Sorry to hear of this. Hope you locate the problem.