ive got a very feint knock around 2 3k rpm on light acceleration any ideas the head tech at the honda dealer told me it sounds normal but having been a mechanic before i dont think it does sound normal ive never worked on these engines or had anything to do with them so dont know what is normal and isnt

 

so first it was smoking, now its knocking? id do a compression test and leakdown test and see what kind of health this motor is in...sounds like it might have some issues

 

i think the soke was steam after i put my foot down a bit it was clear till it had been idling then did it again the noise my honda dealer said was normal but im not so sure

 

my car doesnt make a knocking noise at any rpm, so i would say thats not normal...sound clip would probably help a lot

 

Ok my two cents is it may be the timing chain tensioner. The s2000 is notorius for this issue. In fact im about to replace my third one in less than 1 1/2 weeks. This time im buying a brand new one from the hond dealer. It runs about 189$ + tax. I have put 15/50 synthetic oil in and the noise goes away briefly. But after running over 6k rpm a couple times it comes back. Id def check to make sure it isn't the tensioner. And the way you know you have good oil psi is if you still pull vtec. If this tensioner fails me I'm putting a baffled oil pan on next

 

How do you know it's a knock?