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Compression on 2000 v. 96
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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>CustomFastbackCA</b> <br /><small>Member # 1369</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(2003,1,8,12,55,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Did they raise the compression ratio in the 2000 4.6 from the 96 4.6 (2v) enough so that I would not be able to use my 10lb vortech blower on the new engine? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Chico Stang</b> <br /><small>Member # 801</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(2003,1,8,23,2,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Yes, the 96-96 4.6L SOHC engines have lower compression ratios then the 99+ SOHC engines. The simplest reason is becuase of the PI heads.<br /><br />Josh <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Chico Stang</b> <br /><small>Member # 801</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(2003,1,8,23,5,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> as for 10lb's of boost, you might have to lower it down just a little bit, to 8-9, some will say you are completly fine, others will say lower it to 6lb's of boost. I think you will be fine as long as u have the fuel to support them.<br /><br />Josh <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Andrew WOT</b> <br /><small>Member # 1249</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(2003,1,10,14,27,0), 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 Chico Stang:<br /><strong>Yes, the 96-96 4.6L SOHC engines have lower compression ratios then the 99+ SOHC engines. The simplest reason is becuase of the PI heads.<br /><br />Josh</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Actually the compression is the same because simultaneously they switched to dished pistons (technically 96-98 pistons were also dished but with smaller dish). But if you bolt PI heads on 96-98 block you'll get higher compression (10.5:1 area), perhaps this fact created some confusion. <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(2003,1,10,15,15,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Didn't they also raise compression in '00 or '01 on the SOHC motors compared to the '99's? If so- anyone know from what to what did they raise it from? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Andrew WOT</b> <br /><small>Member # 1249</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(2003,1,10,15,55,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> tcccoa.com says that in 2001 with PI Romeo heads they raised CR to 9.4:1.<br />But MM&FF has different numbers like 9.74:1<br />BTW great info <a href="http://www.musclemustangfastfords.com/tech/0302MMFF_MixMatch/" target="_blank">http://www.musclemustangfastfords.com/tech/0302MMFF_MixMatch/</a> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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