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Knock during startup and warmup normal?

Old Mar 16, 2015 | 11:17 PM
  #1  
Chowcow's Avatar
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From: Calgary, AB
Default Knock during startup and warmup normal?

My megalog viewer shows knock in all cylinders around 3.6-4 during warmup. During startup, I get crazy amount of knock in the 30s, but this event only lasts for a second or two. Is this normal?

I'm not sure how sensitive the MS3 is but are all logs supposed to read 0 knock at all times?

Should I be really concerned? My timing is very conservative and I've tuned fixed tables.

Rev MS3, 2003 Miata all stock.

I've attached a startup and die log (Idledie) and my tune. I'm hoping I can get some input here.

I'll have the warmup log soon, my current one is a bit too big.

Not sure why I'd be knocking with my settings.
Attached Files
File Type: msq
MiataFinal.msq (213.2 KB, 159 views)
File Type: msl
Idledie.msl (92.3 KB, 108 views)
Old Mar 18, 2015 | 09:04 AM
  #2  
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"Knock" readings on startup may actually be measuring piston slap until the pistons get up to operating temperature.
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Old Mar 18, 2015 | 02:11 PM
  #3  
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I'm still getting knock at ~3.6-4.0 during regular driving in ALL cylinders. They seem to move with each other. Is this normal? Should I be worried about knock at these levels?

Thanks.
Old Mar 18, 2015 | 02:24 PM
  #4  
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This is just noise. I wouldn't worry about knock below 15-20%.
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