Can anyone tell me what this bad knock in my rx8 is. I think it maybe s bearing. The engine starts fine hot or cold compression seems ok. I purchased the engine from ebay with supposedly 40 to 60 thousand miles on it I will try to attach a couple of vids on it. No luck on the video. I have had this car since 2009 its on 05. My engine has low compression. So much so its would start cold but really hard to start hot if it all.

 

"I purchased the engine from ebay with supposedly 40 to 60 thousand miles on it"

Might be your problem....

 

Can you put the video on YouTube or something?