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Message: <blockquote data-quote="llsaw" data-source="post: 1037034" data-attributes="member: 1345">Yes but running too lean also raise the temp to beyond acceptable levels. It's all in the compromises. High lift cams will also bleed off the dynamic compression. Most NA big cams are high lift and also high duration. Prooperly implemented individual throttle bodies or as you call it 4 throttle or 6 throttle or 8-12 throttle depending on how many cylinders you have do utilize carefully ducted airboxes and piping. Just check on the BTCC engines from previous years (before the single TB regulation) or even any modern NA race engine. One good drag example would be the latest Skunk2 racecars but those are probably running close to or more than 16.0:1 compression. If yours is filterless or running on sock-type filters and sucking in the hot air.. Oh well.. looks fierce though ;) So irregardless of what a one race 400 m drag setup you want to use which is probably out of scope for 99% of the ZTH forumners, the original point is that 97 octane is ok for a high compression engine if you map and setup your engine carefully. And yes.. a higher compression engine running on this petrol will make more power than one with lesser compression again provided the parameters and engine mapping is optimum. There are however limits to the compression you can run with 97 octane petrol before all this becomes a waste of exercise and this exact figure depends on which tuner you speak too as the engine combination and setups are frankly endless..</blockquote>

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