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techtalk:ref:svcproc26 [2020/02/27 00:32] hippysmack [Machined Squish Band] |
techtalk:ref:svcproc26 [2020/02/27 01:00] 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 Performance. \\ | ||
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