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Message: <blockquote data-quote="astroboy" data-source="post: 371819" data-attributes="member: 4527">If that's the case, then detonation still occurs when the piston is on its way up due to the high compression and merely time the spark plug to ignite earlier to match with detonation would only eliminate the knock but logically, with combustion occur while piston is moving up doesn't sound right, or healthy le.Myvi is on VVti 1.3L same as my mini MPV le, compression 10:0, rpm peak at 6,800, higher than my E90, don't play play.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> in fact all the Proton Campro family is on compression 10:0 lio.</blockquote>