octane formula for compression?
Is there a formula for determining the need octane for a given cr. If there is does it take into account the dynamic compression ratio or only the static? Is there a quick table somewhere that shows the relationships like a spreadsheet?
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My engine comes up with it's own formula, unfortunately it usually wants more octane... It also will depend on load and altitude and things like that. If you are running around 9.5:1, you should be safe with regular fuel. Other than that, your engine will tell you what it needs. :cool:
--Mike |
Here's a list of things that affect octane requirement
load carbon deposit levels manual or automatic tranny air temperature water temperature iron or aluminum heads bore diameter spark timing boost level EGR level humidity squish swirl/tumble number and location of spark plugs sharp edges/hot spots and I've probably forgotten some Here's a good link: http://www.chevron.com/prodserv/fuel...rgas/ch5.shtml look under "Octane Number Requirement and Octane Requirement Increase" Look at the table in Figure 5-9. |
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