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techtalk:ref:svcproc26 [2020/02/27 00:59] hippysmack [Compression Ratio] |
techtalk:ref:svcproc26 [2020/03/02 04:11] hippysmack [Direct Method] |
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| But this method works great with flat or angled head surfaces. The tools required are no more than if you are installing the heads. \\ | But this method works great with flat or angled head surfaces. The tools required are no more than if you are installing the heads. \\ | ||
| - | Place the solder in multiple places around the piston top. \\ | + | * Place the solder in multiple places around the piston top. \\ Grease works best to hold the solder but if using tape, keep it below the squish band. \\ |
| - | Grease works best to hold the solder but if using tape, keep it below the squish band. \\ | + | * Install the head gaskets and heads then follow the torque procedure to full torque spec. \\ Next, remove the heads following the removal sequence in the FSM to keep from warping them. |
| + | * Then measure the compressed side of the solder pieces with a caliper. | ||
| + | * Write the measurements down to conclude and average the squish band dimension. | ||
| - | | Solder held with grease. ((photo by aswracing of the XLFORUM ))| | + | | Solder held with grease. ((photo by aswracing of the XLFORUM )) | Remove the heads to reveal how far the solder was compressed. ((photos by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) || |
| - | |{{:techtalk:ref:svcproc:squish_band_1_by_aswracing.jpg?direct&300|}}| | + | |{{:techtalk:ref:svcproc:squish_band_1_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_1_by_johnk.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_2_by_johnk.jpg?direct&300|}}| |
| - | Install the head gaskets and heads then follow the torque procedure to full torque spec. \\ | + | | Measure the compressed side of the solder pieces. ((photo by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) | Write the measurements down to conclude and average squish band dim. ((photos by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) || |
| - | Next, remove the heads following the removal sequence in the FSM to keep from warping the heads. \\ | + | |{{:techtalk:ref:svcproc:checking_squish_3_by_johnk.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_5_by_johnk.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_4_by_johnk.jpg?direct&300|}}| |
| - | + | ||
| - | | Remove the heads to reveal how far the solder was compressed. ((photos by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) || | + | |
| - | |{{:techtalk:ref:svcproc:checking_squish_1_by_johnk.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_2_by_johnk.jpg?direct&300|}}| | + | |
| - | + | ||
| - | | Measure the compressed side of the solder pieces. ((photo by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) | | + | |
| - | |{{:techtalk:ref:svcproc:checking_squish_3_by_johnk.jpg?direct&300|}}| | + | |
| - | + | ||
| - | | Write the measurements down to conclude and average squish band dim. ((photos by JohnK of the XLFORUM http://xlforum.net/forums/showthread.php?p=3944070)) || | + | |
| - | |{{:techtalk:ref:svcproc:checking_squish_5_by_johnk.jpg?direct&300|}}|{{:techtalk:ref:svcproc:checking_squish_4_by_johnk.jpg?direct&300|}}| | + | |
| ====== Gaining a Squish Band Due to a Conversion ====== | ====== Gaining a Squish Band Due to a Conversion ====== | ||
| **Converting an 883**: \\ | **Converting an 883**: \\ | ||
| Line 126: | Line 119: | ||
| Some were lowered for gas mileage / EPA or raised for performance. \\ | 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. \\ | 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. | + | Then you can fine tune with gasket thickness. \\ |
| However; \\ | 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)) \\ | ||
| Line 159: | Line 152: | ||
| 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. \\ | + | You can also [[http://www.nrhsperformance.com/nrhscalculator.shtml|click here to download a compression ratio calculator]] from NRHS Performance. \\ |
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| [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | ||
