History of the HEMI

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0><script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-47423994-1', 'fortunecity.ws'); ga('send', 'pageview'); </script> <center> <br> <div> <script language="javascript" type="text/javascript" src="http://ad.broadcaststation.net/ads/show_ad.php?width=728&height=90"></script> </div> </center> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=90 BGCOLOR="#CCFF99" TEXT="#080000" bgproperties="fixed" background="04078671esnimw.gif"> <div> <FONT SIZE="5" COLOR="#CCFF99" FACE="Arial" ><B>Drag Racing Mopar Style</B></FONT><B>     |     </B><A HREF="index.htm" TARGET="_top" TITLE="Drag Racing Mopar Style"><U><B>home</B></U></A></div> <div>                                                   </div> <div> </div> </td> </tr><tr> <td valign="top" width=200 BGCOLOR="#336699" TEXT="#080000" bgproperties="fixed" background="041c83b3.gif"> <div>  <img src="HTMLobj-404/aniGif.gif" border="0" align="bottom" width="292" height="261">  </div> </td> <td valign="top" height=390 BGCOLOR="#CCFF99" TEXT="#080000"> <div> <I>History of the HEMI </I></div> <div> <I> <img src="HTMLobj-405/aniGif.gif" border="0" align="bottom" width="300" height="43">  </I></div> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="593" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=CENTER HEIGHT= 19 WIDTH="589"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="19" ALIGN="bottom" WIDTH="589" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 41 WIDTH="589"><div> Introduction and History </div> <bR> </tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 1702 WIDTH="589"><div> Introduction </div> <div> Chrysler's Hemi is considerd by many to be the finest engine ever made. I have created this website to be a (hopefully) useful resource for those interested in the Hemi, and for those always looking to learn a bit more. Thanks, enjoy the website and please spread the word. </div> <div> Scott Moseman (<FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><U>scottm@scotech.com</U></FONT>) </div> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="516" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 386 WIDTH="338"><div> Early Hemi R&D </div> <div> The years following World War II brought upon new designs for performance. Chrysler had to find a way to increase power without increasing compression, which would require higher octane fuel. The key was thought to be in the better designed cylinder head, perhaps hemispherical with conventional valve-in-head. Using hemi heads would increase thermal and volumetric efficiency, as well as provide a low surface-to-volume ratio (thus minimizing losses due to combustion-chamber deposits). Why was this design not used earlier in autos, see as it has been around since at least 1904? Complexity and high costs did not allow easy mass production, and the rugged engine loved high octane gas. Chrysler teams researched every engine available, and the hemi head design proved to be the most powerful and efficient model they could find. </div> </tD> <tD VALIGN=TOP><NOBR><bR> <bR> <bR> <bR> <bR> <bR> <bR> <div> <IMG SRC="12fa39f0.jpg" border=0 width="163" height="159" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <bR> <bR> </NOBR></tD> </tR> </TABLE></div> <div>  </div> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="517" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 382 WIDTH="338"><div> Early Hemi R&D </div> <div> The years following World War II brought upon new designs for performance. Chrysler had to find a way to increase power without increasing compression, which would require higher octane fuel. The key was thought to be in the better designed cylinder head, perhaps hemispherical with conventional valve-in-head. Using hemi heads would increase thermal and volumetric efficiency, as well as provide a low surface-to-volume ratio (thus minimizing losses due to combustion-chamber deposits). Why was this design not used earlier in autos, see as it has been around since at least 1904? Complexity and high costs did not allow easy mass production, and the rugged engine loved high octane gas. Chrysler teams researched every engine available, and the hemi head design proved to be the most powerful and efficient model they could find. </div> </tD> <tD VALIGN=TOP><NOBR><bR> <bR> <bR> <bR> <bR> <bR> <bR> <div> <IMG SRC="131a38a0.jpg" border=0 width="163" height="138" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <bR> <bR> <bR> </NOBR></tD> </tR> </TABLE></div> <div>       </div> <div>  </div> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="516" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 442 WIDTH="337"><div> Hemi Head Durability </div> <div> The 426 Hemi engine was designed and built with a very short deadline, but that did not stop it from being the most well-built engine ever made. The engine had a max vertical separating load of 18,800 lb @ 7200 rpm along the crankshaft center line. Frank Bialk had the job of designing the new main bearing caps, which he took advantage of the deep skirt walls by adding cross bolts through the block into the caps. With this, the engine block skirt helped the main bearing caps in resisting the loads. </div> <div> Bolting the heads to the block is crucial to get         max power. The hemi heads were designed with an  extra bolt, <I>the fifth head bolt</I>, to give it the extra strength. The position of that bolt was going to be directly in the way of the pushrods and intak port, which would restrict power. Again, Frank Bialk came up with a design to bring the bolts up from the bottom instead. The new pattern worked extremely well, and the Hemi engine was put into production. </div> </tD> <tD VALIGN=TOP WIDTH="168"><div> <IMG SRC="1377eec0.jpg" border=0 width="126" height="236" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"><IMG SRC="13a7ec40.jpg" border=0 width="126" height="196" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </tD> </tR> </TABLE></div> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="517" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 267 WIDTH="338"><div> 426 Street Hemi </div> <div> It did not take much engineering changes to allow the 426 Hemi to work in street production cars. Mounting lugs added to the side of the block, additional vibration damper, forged pistons to allow 10.25:1 compression, streetable cam, lower valve spring rates (to avoid premature wear and limit engine rpm), deep oil pan with baffles, larger diameter oil pump, black valve covers, air cleaner and cover, and a high speed water pump with small impeller to help keep it cool at the drags. Willem L. Weertman co-authored the SAE paper for the street Hemi with Bob Lechner in April 1966.</div> </tD> <tD VALIGN=TOP><NOBR><bR> <bR> <bR> <div> <IMG SRC="13ca3a30.jpg" border=0 width="163" height="163" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> </TABLE></div> <bR> </tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 38 WIDTH="589"><bR> <bR> </tD> </tR> </TABLE></div> <DIV ALIGN="LEFT"></DIV> <div> Copyright © 1996-2001 Scott Moseman. All rights reserved.</div> <bR> <div>  </div> <div> <A HREF="http://www.thehemi.com/" TARGET="_top" TITLE="http://www.thehemi.com/"><U><IMG SRC="0afa6930.jpg" border=0 width="422" height="147" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></U></A></div> <bR> <bR> </td> </tr></table></body>