<font face="Verdana, Arial" size="2">Originally posted by 71dsp:
According to my engine builder (Larry at Endyn) the grooves in the oil pump were caused by excessive vibration in the crank, which is most likely caused by using a nondamped solid crank hub.
Now, I don't know what a regular oil pump should look like on an H22, but the oil pump that Larry took apart for me had 45k miles on it, with 30k of those miles with the pulley. What I am trying to say is that the oil pump was just getting broken in! The way that the damage was discovered is that Larry was supposed to modify the oil pump for racing use, but the grooves were so bad that the pump had to be replaced.
One other thing is that before the engine was torn down, there were NO symptoms. No problems whatsoever. No noise, etc. etc. The other thing that bothers me is that the bearing wear was so excessive, and that metal had to go somewhere. Before it got to the oil filter, it went through my rod bearings, etc. etc.
I think the only symptoms that I have heard of (although never actually seen) are oil pump failures and bearing failures.
</font>