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Leak down test results, what exactly do they mean?
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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>166 Merlot</b> <br /><small>Member # 1549</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(2007,8,21,19,37,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Wussup Cafords! My engine has 130 and has been boosted for the past 10k. 3rd set of head gaskets currently. still not 100% tuned. most of the air ended up coming out of the valve cover breather and throttle body. Oh yea and I performed the test on a cold engine. how would this affect my results?<br /><br />Cylinders:<br /><br />4-40% 8-40%<br />3-20% 7-20%<br />2-25% 6-25%<br />1-20% 5-20% <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>JohnB</b> <br /><small>Member # 969</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(2007,8,21,20,55,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Did you rotate the engine over to BTDC for each test?? It doesn't look like it... <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Mean2001GT</b> <br /><small>Member # 1750</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(2007,8,21,23,4,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> with all the head gaskets i'd be concerned if any bubbles were coming out of the radiator during the leak down. but if it's coming out of the breather it means you have blow-by. which is what is supposed to happen, especially when the engine is cold. but 40% is too high. 15%-25% is pretty average. <br /><br />are you chasing a problem? or just testing? another test you may want to consider is a "running compression" test. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>166 Merlot</b> <br /><small>Member # 1549</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(2007,8,22,15,47,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> yea i matched up the rotor to the corresponding plug wire to do the test. No bubbles from the radiator <img border="0" title="" alt="[Smile]" src="smile.gif" /> <br /><br />I'm kinda chasing a problem, kinda just curious to see. haven't done a running compression test, what the difference between that and a regular compression test? I might have to look into that. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>hidnn.o.s.</b> <br /><small>Member # 1219</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(2007,8,22,15,53,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> From what I've seen, good leakdown numbers are BELOW 10%<br /><br />Goodluck with that <img border="0" title="" alt="[Frown]" src="frown.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>88DroptopGT</b> <br /><small>Member # 2535</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(2007,8,23,5,50,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Repeat the test with the engine at operating temperature since this is when you actually drive the car. The readings <i>should</i> be somewhat less then we are getting in reasonable territory. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>hidnn.o.s.</b> <br /><small>Member # 1219</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(2007,8,23,22,53,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Warm leakdown numbers should definitely be UNDER 10% <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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