Ever since I had my forged internals installed I have had this funny rattle coming from my engine (2002 Turbo Mazda P5). When the car is first started there is the normal rattle coming from the forged pistons (which are WISECO pistons), but after driving for a bit it goes away (as expected). But there is another rattle which happens when you rev the car (it doesn't matter how long you have been driving for). It doesn't make a sound at idle. We originally thought that it was the bucket and shims that might need adjusting.

Today I took my car into Mazda to have the Bucket and Shims adjusted. They said it would be a two day job, but then early in the afternoon I got a call from Mazda that I didn't want. They said that they have measured the shims and they are fine, and they also checked the tappets. They said that they don't think the rattle is coming from the top end but from the bottom end. They also said that it might be the grutchen pins.

Both the guys that did the re-build and the guy that installed and tunes my Halteck computer say that it doesn't sound like bottom end. The mechanic also said that if it was they grutchen pins then it would be making a rattling sound all the time, at idle and when accelerating.

I am now very confused and I don't know what to do. Has anyone else experienced this. Does anyone have any ideas. Any help would be much appreciated.

Thanks.