Pistons and rings
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(→KB ring gap and piston to wall clearance instructions: clean up) |
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==KB ring gap and piston to wall clearance instructions== | ==KB ring gap and piston to wall clearance instructions== | ||
| − | {{Note1}}The following info is for the KB Icon/FHR (Forged Head Relief) series and | + | {{Note1}}The following info is for the KB Icon/Icon FHR (Forged Head Relief) series and various KB hypereutectic pistons. Refer to manufacturer's instructions to verify these specs as revisions/redesigns may cause them to vary, and for other brands and types of pistons. |
| − | ;[http://www.kb-silvolite.com/ | + | ;[http://www.kb-silvolite.com/kb_car/clearance_pop.php Suggested Ring End Gap and Piston to Wall Clearance]<nowiki>:</nowiki> |
| − | KB pistons can be installed tighter than other performance pistons. A close fitting piston rocks less, supports the rings better and seals the engine for maximum power. When a loose fit engine is desired the rigid skirt design of the KB piston allows the builder a choice without fear of piston damage. | + | KB pistons can be installed tighter than other performance pistons. A close fitting piston rocks less, supports the rings better and seals the engine for maximum power. When a loose fit engine is desired the rigid skirt design of the KB piston allows the builder a choice without fear of piston damage. See the clearance chart below for minimum and realistic maximum loose fit clearance for KB pistons. |
| − | + | ||
| − | + | ||
| − | '''Example:''' 4" bore "Street Normally Aspirated" = 4" bore x 0.0065 = 0.026 top ring end gap. NOTE: Second ring end gaps do not need extra clearance. Dyno and track testing has shown that 34 degrees or less total ignition timing makes the best HP and time. Excessive spark advance, lean fuel mixture or too much compression for the fuel and cam used will make heat sufficient to butt piston rings with as much as .060" ring end gap. The entire top land can expand enough to contact the cylinder walls, when close to melt down temperatures are reached. | + | ===Special notice on Keith Black piston top ring end gap=== |
| + | {{!}}The Keith Black pistons unique thermal conductivity, ring location and varied end use requires special attention be paid to top ring end gap. KB pistons make more HP by reflecting heat energy back into the combustion process and, as a result, the top ring runs hotter and requires additional end clearance. Increasing ring end gap does not affect performance or oil control because normal end gaps are realized at operating temperatures. Failure to provide sufficient top ring end gap will cause a portion of the top ring land to break as the ring ends butt and lock tight in the cylinder. The broken piece may cause further piston or engine damage. Safe top ring end gaps can be found by multiplying the bore diameter by the appropriate ring end gap factor from the clearance chart below. | ||
| + | |||
| + | '''Example:''' 4" bore "Street Normally Aspirated" = 4" bore x 0.0065 = 0.026 top ring end gap. NOTE: Second ring end gaps do not need extra clearance. Dyno and track testing has shown that 34 degrees or less total ignition timing makes the best HP and time. Excessive spark advance, lean fuel mixture or too much compression for the fuel and cam used will make heat sufficient to butt piston rings with as much as 0.060" ring end gap. The entire top land can expand enough to contact the cylinder walls, when close to melt down temperatures are reached. | ||
<br><table border="1" cellpadding="2" cellspacing="0"> | <br><table border="1" cellpadding="2" cellspacing="0"> | ||
<tr> | <tr> | ||
<td bgcolor="#FFF8DC" rowspan="3" class="table_label_two" align="center" valign="center" width="180">'''APPLICATION'''</td> | <td bgcolor="#FFF8DC" rowspan="3" class="table_label_two" align="center" valign="center" width="180">'''APPLICATION'''</td> | ||
| − | <td | + | <td colspan="3" class="table_label_two" align="center">'''HYPEREUTECTIC'''</td> |
| − | <td bgcolor="# | + | <td bgcolor="#dddddd" colspan="3" class="table_label_two" align="center">'''FORGED'''</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 113: | Line 114: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Normally Aspirated'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Normally Aspirated'''</span></td> | ||
<td class="row_b" align="center">0.0065"</td> | <td class="row_b" align="center">0.0065"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0020"</td> |
<td class="row_b" align="center">0.0020" - 0.0025"</td> | <td class="row_b" align="center">0.0020" - 0.0025"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0035" - 0.0045"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0035" - 0.0045"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0045" - 0.0055"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0045" - 0.0055"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Towing'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Towing'''</span></td> | ||
<td class="row_b" align="center">0.0080"</td> | <td class="row_b" align="center">0.0080"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0020"</td> |
<td class="row_b" align="center">0.0020" - 0.0025"</td> | <td class="row_b" align="center">0.0020" - 0.0025"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | ||
| − | <td class="row_b" align="center">0.0040" - 00.0050"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0040" - 00.0050"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0050" - 0.0060"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0050" - 0.0060"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Nitrous or Supercharged'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Street - Nitrous or Supercharged'''</span></td> | ||
<td class="row_b" align="center">0.0080"</td> | <td class="row_b" align="center">0.0080"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0020" - 0.0025"</td> |
<td class="row_b" align="center">0.0025" - 0.0035"</td> | <td class="row_b" align="center">0.0025" - 0.0035"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | ||
| − | <td class="row_b" align="center">0.0045" - 0.0055"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0045" - 0.0055"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0065"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0065"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track -<br> 2 BBL or Restrictor Plate Gasoline'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track -<br> 2 BBL or Restrictor Plate Gasoline'''</span></td> | ||
<td class="row_b" align="center">0.0070"</td> | <td class="row_b" align="center">0.0070"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0045"</td> |
<td class="row_b" align="center">0.0020" - 0.0050"</td> | <td class="row_b" align="center">0.0020" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0040" - 0.0050"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0040" - 0.0050"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0065"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0065"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track - Unrestricted'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track - Unrestricted'''</span></td> | ||
<td class="row_b" align="center">0.0080"</td> | <td class="row_b" align="center">0.0080"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0025" - 0.0045"</td> |
<td class="row_b" align="center">0.0030" - 0.0045"</td> | <td class="row_b" align="center">0.0030" - 0.0045"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0045" - 0.0065"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0045" - 0.0065"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0075"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0075"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track - Alcohol Injection'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track - Alcohol Injection'''</span></td> | ||
<td class="row_b" align="center">0.0060"</td> | <td class="row_b" align="center">0.0060"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0025" - 0.0045"</td> |
<td class="row_b" align="center">0.0025" - 0.0050"</td> | <td class="row_b" align="center">0.0025" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0045" - 0.0065"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0045" - 0.0065"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0075"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0075"</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track - | + | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Circle Track -<br> Carb Alcohol'''</span></td> |
<td class="row_b" align="center">0.0080"</td> | <td class="row_b" align="center">0.0080"</td> | ||
| − | <td bgcolor= | + | <td bgcolor=" class="row_a" align="center">0.0030" - 0.0045"</td> |
<td class="row_b" align="center">0.0030" - 0.0050"</td> | <td class="row_b" align="center">0.0030" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | ||
| − | <td class="row_b" align="center">0.0050" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0050" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Gasoline'''</span></td> | + | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag -<br> Gasoline'''</span></td> |
<td class="row_b" align="center">0.0075"</td> | <td class="row_b" align="center">0.0075"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0045"</td> |
<td class="row_b" align="center">0.0020" - 0.0045"</td> | <td class="row_b" align="center">0.0020" - 0.0045"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0050" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0050" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Alcohol'''</span></td> | + | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag -<br> Alcohol'''</span></td> |
<td class="row_b" align="center">0.0065"</td> | <td class="row_b" align="center">0.0065"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0045"</td> |
<td class="row_b" align="center">0.0020" - 0.0045"</td> | <td class="row_b" align="center">0.0020" - 0.0045"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0040" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0040" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0050" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0050" - 0.0080"</td> | ||
</tr> | </tr> | ||
| Line 194: | Line 195: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged or Nitrous Gasoline'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged or Nitrous Gasoline'''</span></td> | ||
<td class="row_b" align="center">0.0095"</td> | <td class="row_b" align="center">0.0095"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0020" - 0.0045"</td> |
<td class="row_b" align="center">0.0025" - 0.0050"</td> | <td class="row_b" align="center">0.0025" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | ||
| − | <td class="row_b" align="center">0.0060" - 0.0090"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0060" - 0.0090"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0070" - 0.0100"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0070" - 0.0100"</td> | ||
</tr> | </tr> | ||
| Line 203: | Line 204: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged Alcohol'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged Alcohol'''</span></td> | ||
<td class="row_b" align="center">0.0085"</td> | <td class="row_b" align="center">0.0085"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0045"</td> |
<td class="row_b" align="center">0.0025" - 0.0045"</td> | <td class="row_b" align="center">0.0025" - 0.0045"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0050"</td> | ||
| − | <td class="row_b" align="center">0.0050" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0050" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged Fuel'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Drag - Supercharged Fuel'''</span></td> | ||
<td class="row_b" align="center">0.0115"</td> | <td class="row_b" align="center">0.0115"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0030" - 0.0050"</td> |
<td class="row_b" align="center">0.0035" - 0.0055"</td> | <td class="row_b" align="center">0.0035" - 0.0055"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0060"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060"</td> | ||
| − | <td class="row_b" align="center">0.0070" - 0.0100"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0070" - 0.0100"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0080" - 0.0110"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0080" - 0.0110"</td> | ||
</tr> | </tr> | ||
| Line 221: | Line 222: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Marine - Normally Aspirated'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Marine - Normally Aspirated'''</span></td> | ||
<td class="row_b" align="center">0.0080"</td> | <td class="row_b" align="center">0.0080"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0030" - 0.0045"</td> |
<td class="row_b" align="center">0.0035" - 0.0050"</td> | <td class="row_b" align="center">0.0035" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0045" - 0.0060"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0045" - 0.0060"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0070"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0055" - 0.0070"</td> | ||
</tr> | </tr> | ||
| Line 230: | Line 231: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Marine - Supercharged'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Marine - Supercharged'''</span></td> | ||
<td class="row_b" align="center">0.0090"</td> | <td class="row_b" align="center">0.0090"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0030" - 0.0045"</td> |
<td class="row_b" align="center">0.0035" - 0.0050"</td> | <td class="row_b" align="center">0.0035" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0045"</td> | ||
| − | <td class="row_b" align="center">0.0055" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0055" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0065" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0065" - 0.0080"</td> | ||
</tr> | </tr> | ||
| Line 239: | Line 240: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Air Cooled Baja'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Air Cooled Baja'''</span></td> | ||
<td class="row_b" align="center">0.0075"</td> | <td class="row_b" align="center">0.0075"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0030" - 0.0045"</td> |
<td class="row_b" align="center">0.0035" - 0.0050"</td> | <td class="row_b" align="center">0.0035" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0050" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0050" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060" - 0.0080"</td> | ||
</tr> | </tr> | ||
| Line 248: | Line 249: | ||
<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Propane'''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Propane'''</span></td> | ||
<td class="row_b" align="center">0.0065"</td> | <td class="row_b" align="center">0.0065"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0015" - 0.0045"</td> |
<td class="row_b" align="center">0.0020" - 0.0045"</td> | <td class="row_b" align="center">0.0020" - 0.0045"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0040"</td> | ||
| − | <td class="row_b" align="center">0.0035" - 0.0070"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0035" - 0.0070"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0045" - 0.0080"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0045" - 0.0080"</td> | ||
</tr> | </tr> | ||
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<td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Monster Truck or Mudbog - Supercharged '''</span></td> | <td bgcolor="#FFF8DC" class="row_a" align="left"><span class="small_label">'''Monster Truck or Mudbog - Supercharged '''</span></td> | ||
<td class="row_b" align="center">0.0090"</td> | <td class="row_b" align="center">0.0090"</td> | ||
| − | <td bgcolor= | + | <td bgcolor= class="row_a" align="center">0.0025" - 0.0045"</td> |
<td class="row_b" align="center">0.0030" - 0.0050"</td> | <td class="row_b" align="center">0.0030" - 0.0050"</td> | ||
<td bgcolor="#dddddd" class="row_a" align="center">0.0060"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0060"</td> | ||
| − | <td class="row_b" align="center">0.0080" - 0.0100"</td> | + | <td bgcolor="#dddddd" class="row_b" align="center">0.0080" - 0.0100"</td> |
<td bgcolor="#dddddd" class="row_a" align="center">0.0090" - 0.0110"</td> | <td bgcolor="#dddddd" class="row_a" align="center">0.0090" - 0.0110"</td> | ||
</tr> | </tr> | ||
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