Control of Knock in a turbo charged vehicle is, historically, controlled with lower compression compared to naturally aspirated engines.
Besides compression designed into the engine, lowering boost levels, increasing octane requirements in fuel, retard timing, and finally management of fueling to the cylinder interact
on whether a vehicle will knock under boost.
I document over the course of three videos my oil dilution problem with my 2017 Honda CRV 1.5T engine. It appears this problem
is not necessarily wide spread, or varies in severity amongst other vehicles and owners. Usage of 91 octane virtually eliminated my vehicles oil dilution problem which
brings up several important questions that leads to my suspicion of Knock management. Is knock occurring and related to my driving habits?
Is knocked detected because of a hardware problem whether that be a sensor or noisy engine? By using 87 octane does engine management move to an increased fueling scenario to deal with detected knock? Does switching to 91 octane satisfy and temper the knock situation thus lowering fueling situation that ultimately leads to oil dilution? Is the vehicle ultimately operating as designed?
Papers surrounding increased fueling dealing with knock.
https://www.sae.org/publications/technical-papers/content/2018-01-1665/
https://www.sciencedirect.com/topics/engineering/combustion-knock
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2017 Honda CR-V 1.5T
Complete Video Series:
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First Video detailing 1" oil rise above normal, oil sample, with 87 Octane - #1
https://youtu.be/9sLhMDkolxw
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Second Video detailing no oil rise, oil sample results, with 91 octane - #2
https://youtu.be/Dc1bBQiUI-s
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From 91 Octane to 87 Octane - 1/2 Inch Oil Rise - 2017 Honda CR-V - #3
https://youtu.be/yYMhTHpd1TE
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Honda Oil Dilution Test Results - 3000 Miles w/87 Octane - #4
https://youtu.be/lVhXrCuxDaM
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Honda Oil Dilution - Winter Oil Sample Test w/91 Octane - Dreaded P0172 #5
https://youtu.be/hfNBq-471aY
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2017 Honda GDI (Injector) Replacement - P0172 - Earth Dreams - #6
https://youtu.be/5U853xR7vyo
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Post Injector Replacement - Honda 1.5L Turbo Winter Oil Sample - 87 Octane - #7
https://youtu.be/H5WuXMko1uc
@factotumlife