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Message: <blockquote data-quote="astroboy" data-source="post: 349362" data-attributes="member: 4527">Yes... engine will run hotter by common sense with the increased compression ratio. Normally JDM cooling can cope with it, but a bigger radiator is always advisable after a skim, or another common practice is to remove all the thermostat valves in the cooling system. We do that in the JDM allowing coolant to circulate at full velocity immediately without the need of waiting for engine temperature to rise. One more trick for the JDM is to use a higher pressure radiator cap.. <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" /> allowing the coolant to operate at higher pressure point, thus higher boiling point. But in BMW, this is not an option.. I think..With the higher compression, the next thing u see will probably be the leaky gasket.. <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" /> BMW by default is already running higher compression to optimise on performance. There really is no free lunch in this world. Everything we do, has a trade-off/reaction/fruit. God is fair!.. :wink:As recommended above, u might get away with it by overhauling your cooling system, if u are lucky..</blockquote>

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