S2000 Engine Management Engine management topics, map and advice.

Am I understanding knock tuning correctly?

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Old Apr 5, 2010 | 11:19 AM
  #11  
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Originally Posted by gernby,Apr 5 2010, 02:02 PM
If I had paid for my calibration, I wouldn't be so willing to share it, but I don't mind sharing what I have right now. Send me a PM with your email address, and I'll shoot it over to you.

Nick, just to rule out the valve adjustment as a possible issue, are you sure you are measuring the clearances at the right location? From personal experience, I know that some Honda's have clearances spec'ed between the cam lobe and rocker while others spec the clearance between the adjuster screw and valve. When I first adjusted the valves on my '02 AP1, I measured between the lobe and rocker, and wound up setting my clearances WAY TOO BIG. I lost quite a bit of power and my valves were really noisy. IIRC I gained over 10 ft-lbs on the dyno when I fixed it. If that's not the issue, then I would start getting concerned about a valve problem. Have you done a leak down test?
I'm pretty sure I'm doing it right - I just adjusted them again yesterday morning with a little more care and attention to getting it just perfect - haven't driven the car yet but I'll update when I do. I did this the same way on my 04 and didn't have the same issues. But I was running an AP1 ecu in that car so maybe the knock sensor was less sensitive with that ecu.
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Old Apr 5, 2010 | 11:23 AM
  #12  
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Well, if you measured between the adjuster screw and the top of the valve, then that would be correct.
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Old Apr 5, 2010 | 11:40 AM
  #13  
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Originally Posted by gernby,Apr 5 2010, 02:23 PM
Well, if you measured between the adjuster screw and the top of the valve, then that would be correct.
I heard you the first time
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Old Apr 5, 2010 | 12:22 PM
  #14  
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Originally Posted by TheNick,Apr 5 2010, 02:40 PM
I heard you the first time
LOL ... just wanted to make sure we were on the same page since you said "I'm pretty sure I'm doing it right" instead of "Yep, that's the way I did it.".
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