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New Edge Cobras
Highest compression for boost?
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<blockquote data-quote="na svt" data-source="post: 13061842" data-attributes="member: 35346"><p>High boost should get lower compression but even then not all should get 8.5:1. The CR, like the cams, and every other component should be spec'd to meet the goals in the most efficient manner. With that, if the boost is no higher than 12psi an 8.5:1 CR will result in a lot less average hp/tq than with a flat top or even a stock piston..50rwhp/tq If the planned boost is 20psi then of course the compression should be lower, especially if it's going to be run on pump gas.</p><p></p><p>With that, if there are no plans to add more than 12psi, the compression level is absolutely safe with flat tops and the power made will be 50rwhp/50rqtq higher than a similar 8.5:1 combo. I've seen a few unhappy people after they replaced their stock shortblocks with one that has a 8.5:1 CR...none were happy about making less power with the new engine.</p><p></p><p>When I talk about pump gas I'm thinking of 93 octane, not the 91 that sold in some areas.</p></blockquote><p></p>
[QUOTE="na svt, post: 13061842, member: 35346"] High boost should get lower compression but even then not all should get 8.5:1. The CR, like the cams, and every other component should be spec'd to meet the goals in the most efficient manner. With that, if the boost is no higher than 12psi an 8.5:1 CR will result in a lot less average hp/tq than with a flat top or even a stock piston..50rwhp/tq If the planned boost is 20psi then of course the compression should be lower, especially if it's going to be run on pump gas. With that, if there are no plans to add more than 12psi, the compression level is absolutely safe with flat tops and the power made will be 50rwhp/50rqtq higher than a similar 8.5:1 combo. I've seen a few unhappy people after they replaced their stock shortblocks with one that has a 8.5:1 CR...none were happy about making less power with the new engine. When I talk about pump gas I'm thinking of 93 octane, not the 91 that sold in some areas. [/QUOTE]
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Highest compression for boost?
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