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techtalk:ref:svcproc26 [2020/02/27 00:32] hippysmack [Machined Squish Band] |
techtalk:ref:svcproc26 [2020/02/27 00:59] hippysmack [Compression Ratio] |
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| ====== Compression Ratio ====== | ====== Compression Ratio ====== | ||
| + | Since the beginning of the Sportster line, Harley Davidson has changed head gaskets as way of changing or adjusting compression ratio. \\ | ||
| + | Some were lowered for gas mileage / EPA or raised for performance. \\ | ||
| + | The first thing usually thought of is to change the piston and/or head type to change the compression ratio. \\ | ||
| + | Then you can fine tune with gasket thickness. | ||
| + | However; \\ | ||
| <blockquote>Three tenths of a point in compression isn't really worth your time to tear it down. What's more, just the tolerance is greater than that. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1230012)) \\ | <blockquote>Three tenths of a point in compression isn't really worth your time to tear it down. What's more, just the tolerance is greater than that. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1230012)) \\ | ||
| In other words it's entirely possible your motor is already 10:1 or higher and likewise it's possible it's already 9.4:1 or lower. \\ | In other words it's entirely possible your motor is already 10:1 or higher and likewise it's possible it's already 9.4:1 or lower. \\ | ||
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| So in this example, taking .025" of thickness out of the head gasket bumped the cr about half a point. \\</blockquote> | So in this example, taking .025" of thickness out of the head gasket bumped the cr about half a point. \\</blockquote> | ||
| + | You can also [[http://www.nrhsperformance.com/nrhscalculator.shtml|click here to download a compression ratio calculator]] from NRHS. \\ | ||
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