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Engine pinging/spark knock. High compression.

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  #1  
Old 07-03-2017, 02:11 PM
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Default Engine pinging/spark knock. High compression.

Hey guys need some help. I did a rebuild on my 88ci and have about 10.7:1 compression with 585 cams. After I had a bad ping. Jets were 48 pilot and 190 main it's alot better now that I'm at 42 pilot and 185 main. Any advise. Also running 93 octane with octane boost.
 
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Old 07-03-2017, 02:36 PM
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Increasing fuel helps but you may have to pull back the timing a few degrees
 
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Old 07-03-2017, 02:49 PM
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Compression is a bit high. You're going to need a very good tuner or you'll need to lower the comp a bit. If you're using a .030 head gasket, moving to a .040 should put you into a safer range.
 
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Old 07-03-2017, 08:09 PM
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Should be able to run that easy.. What are the ignition settings.
 
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Old 07-06-2017, 10:43 PM
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Stock ignition I think I got it figured out I have a 42 pilot and a 170 main
 
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