engine compression vs knock

[grumpyvette]

"grumpy, how do I figure out how much compression I can get away with without having to deal with engine detonation issues"

theres dozens of factors like coolant temperatures, oil temperature, ignition advance curve , your engines quench, distance.

obviously the fuel octane level, cylinder head combustion surface and the material the heads are made from,
heres a few links with related info to read thru,theres no absolute set compression, because theres dozens of factors that contribute to the potential problem,and ways to reduce an engines tendency to detonate under load, like thermal barrier coatings, use of knock sensors, oil coolers ,alcohol injection, etc.
and don,t forget about 80% of the related info you needs in the posted sub links

http://www.swri.org/3pubs/ird2010/synopses/038049.htm

read these threads and pay attention to the pictures
http://garage.grumpysperformance.com/index.php?threads/detonation-damage.2883/#post-31942

https://www.hotrod.com/articles/engine-killer-the-hazards-of-detonation/

http://www.contactmagazine.com/Issue54/EngineBasics.html

http://garage.grumpysperformance.co...octane-for-compression-ratio.2718/#post-35581

http://garage.grumpysperformance.co...ow-to-reduce-its-likely-hood.9816/#post-37278

http://www.contactmagazine.com/Issue54/EngineBasics.html

https://www.ms-motorservice.com/en/technipedia/post/piston-damage-and-causes/

https://mcbperformance.com/p-25418-piston-failures-causes.html

http://www.madsens1.com/saw_piston_fail.htm

http://blog.wiseco.com/everything-you-need-to-know-about-ring-gap

https://www.memoparts.com/img/cms/Documents/Piston Failue.pdf

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you can add a bit of chamber volume and reduce the potential hot spots that help cause detonation by opening and blending and smoothing the combustion chamber

http://zhome.com/ZCMnL/PICS/detonation/detonation.html