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can I run 10.5:1 compression???????
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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>19falcon66</b> <br /><small>Member # 2433</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(2003,1,15,1,15,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Hey I was wondering if I can run 10.5:1 compression and still use pump gas not realy shure what to think I was told i could but I thought I would ask around and see hat other people think.<br /><br />"Wonder if heavens got a ghetto and a drag strip" <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93mustangt</b> <br /><small>Member # 680</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(2003,1,15,1,35,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Yes you can but you need aluminum heads. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>4.6 EATIN GM'S</b> <br /><small>Member # 1633</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(2003,1,15,11,57,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> why would u need aluminum heads i had 11.1 on a old chevy set up with iron heads<br />and yes u could run 10.5:1 on pump gas i have 10.5:1 on my new motor and im going to run 91 octane for it<br />just dont plan on supercharging it <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>19falcon66</b> <br /><small>Member # 2433</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(2003,1,15,12,59,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> i'm not going to supercharge it i am going to be runnong li ke 150 shot of nitrous and i will be using aluminum heads since it will be cheaper since i got a brand new short block. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>4.6 EATIN GM'S</b> <br /><small>Member # 1633</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(2003,1,15,13,5,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> u shouldnt have no problems then <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93mustangt</b> <br /><small>Member # 680</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(2003,1,15,14,4,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>SIR Paint Job w/ '84 TercelOnYoMama</b> <br /><small>Member # 1708</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(2003,1,16,13,44,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> if your car has computer controled timing then you can run a bit more compression than you can with a mechanical dist. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93PONY</b> <br /><small>Member # 60</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(2003,1,16,15,17,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> IMO it really depends on the cam.<br /><br />You can build a 11 to 1 compression motor that runs on pump gas if the cam is small enough. & you run into detonation on 9.5 to 1 motors with a good cam...<br /><br />Compression ratio means very little. Cylinder pressure is what matters. <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(2003,1,16,15,27,0), 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 93mustangt:<br /><strong>Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing?</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Aluminum heads "effectively" lower the compression ratio by drawing heat away from the combustion chamber. For example, a 8.8:1 iron headed motor would "act" like a 8.0:1 motor if the iron heads were replaced with identical aluminum castings.<br /><br />93PONY- can you spec me a cam to fix my leaky power steering rack? Its getting kinda annoying. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93PONY</b> <br /><small>Member # 60</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(2003,1,16,15,32,0), 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> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 93mustangt:<br /><strong>Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing?</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Aluminum heads "effectively" lower the compression ratio by drawing heat away from the combustion chamber. For example, a 8.8:1 iron headed motor would "act" like a 8.0:1 motor if the iron heads were replaced with identical aluminum castings.<br /><br />93PONY- can you spec me a cam to fix my leaky power steering rack? Its getting kinda annoying.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Actually, Aluminum heads disipate heat faster & allow you to run more cylinder pressure on a given octane....it does not lower your compression....<br /><br />No cam for you! <img border="0" title="" alt="[Razz]" src="tongue.gif" /> <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(2003,1,16,15,36,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Which is why I said ""effectively"" and ""act"" in my post. Read what I wrote again and let me know if I wasn't clear on something because once again you just said what I said, but in a different way <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93PONY</b> <br /><small>Member # 60</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(2003,1,16,15,41,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Nah. It's all about cylinder pressure....not compression. 2 different things....related, but no the same. <img border="0" title="" alt="[Wink]" src="wink.gif" /> <br /><br />However in this instance, we are both saying you can run more.....cylinder pressure with aluminum heads given the same octane. <img border="0" title="" alt="[Razz]" src="tongue.gif" /> <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(2003,1,16,15,43,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I never said cyl pressure and compression were the same thing <img border="0" title="" alt="[Razz]" src="tongue.gif" /> <br /><br /> <img border="0" alt="[Whoo Whooooo!]" title="" src="graemlins/woowoo.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <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(2003,1,16,16,31,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You guys are like two little kids fighting for who gets the credit. <img border="0" title="" alt="[Razz]" src="tongue.gif" /> <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(2003,1,16,16,39,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> <img border="0" alt="[worship]" title="" src="graemlins/worship.gif" /> Obviously the guy who has a twin turbo cobra won the credit card fight and not the guy with the stock LX <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>93PONY</b> <br /><small>Member # 60</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(2003,1,16,18,8,0), 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> <img border="0" alt="[worship]" title="" src="graemlins/worship.gif" /> Obviously the guy who has a twin turbo cobra won the credit card fight and not the guy with the stock LX <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">That guy always wins.... Although he doesn't have any parts on the credit card. <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>mustanggt5091</b> <br /><small>Member # 444</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(2003,1,16,20,59,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You shouldnt have any problems. I run 11.1:1 compression on my car ( with aluminum heads ) <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> and can still run 89 octane without knocking and pinging. I run a fuel injected motor so It may be a little different. I can tell you my brothers chevy 400 has 10.25:1 compression and runs fine with 91! <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" /> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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