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fox body compression test
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<table border="0" cellpadding="1" cellspacing="1" width="99%" align="center"> <tr bgcolor="#000000"><td> <table border="0" width="100%" cellpadding="3" cellspacing="0"> <tr bgcolor="#000099"> <td colspan="2" align="left"> <font size="2" color="#ffffff" face="Verdana, Arial"> <b>T O P I C R E V I E W</b> </font></td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>91 5.0</b> <br /><small>Member # 1527</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,11,20,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Anyone know what my compression should be? I gave it a test and all cylinders were about 160 psi. Is this good, bad, what? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Black94 5.0</b> <br /><small>Member # 655</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,11,29,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> When you did the test were all of the spark-plugs out at the same time??...And did you have the throttle all the way open??...How much was the psi on each cyl.?? Around 160psi I think is good..My 5.0l was about 160psi also.. <img border="0" title="" alt="[Smile]" src="smile.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>91sleeper</b> <br /><small>Member # 779</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,11,35,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Dustin if you were to get a Chiltons manual it has a lot of this type of info and other torque specs and other info you need to know that helps out a lot. Not expensive at all. I reccomend you getting one. I'll check for you when I get home. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>shade-tree</b> <br /><small>Member # 298</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,11,48,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The 'hot' readings from my motor (55k mile '94 cobra shortblock) were all 165-170 with the throttle left alone (closed) and multiple cranks from a remote starter (like 5) to get peak value on a stock cam, 9:1 compression stock longblock.<br /><br />being hot or cold can swing it an easy 10 points. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>ONELOWSPLITBUMPR ON N2O ANDONELOWLX</b> <br /><small>Member # 2067</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,12,36,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> damn my small block chevy had about 215 and it ran on pump gas <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>st5150</b> <br /><small>Member # 51</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,14,2,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>cobraman1994</b> <br /><small>Member # 467</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,14,6,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by st5150:<br /><strong>My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though <img border="0" title="" alt="[Eek!]" src="eek.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">your motor is a freak of nature. <img border="0" alt="[worship]" title="" src="graemlins/worship.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>91 5.0</b> <br /><small>Member # 1527</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,14,21,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Black94 5.0:<br /><strong>When you did the test were all of the spark-plugs out at the same time??...And did you have the throttle all the way open??...How much was the psi on each cyl.?? Around 160psi I think is good..My 5.0l was about 160psi also.. <img border="0" title="" alt="[Smile]" src="smile.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">all plugs were out and the throttle was completely open. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>91 5.0</b> <br /><small>Member # 1527</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,14,21,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 91sleeper:<br /><strong>Dustin if you were to get a Chiltons manual it has a lot of this type of info and other torque specs and other info you need to know that helps out a lot. Not expensive at all. I reccomend you getting one. I'll check for you when I get home.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I already have one, I guess ill check in there. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>96Forged281</b> <br /><small>Member # 2158</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,15,16,44,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by cobraman1994:<br /><strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by st5150:<br /><strong>My 200,000 mile motor was 145 psi cold and 155 psi warm. Leak down was anywhere from 20-30% though <img border="0" title="" alt="[Eek!]" src="eek.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">your motor is a freak of nature. <img border="0" alt="[worship]" title="" src="graemlins/worship.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">does the over all compression of the engine make the psi #s differ??? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>st5150</b> <br /><small>Member # 51</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2003,0,16,13,14,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Yes, the static compression ratio of the motor directly affects your compression readings. <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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