Camshaft tech by Dimitri Elgin
From Crankshaft Coalition Wiki
(Clean up) |
(→Introduction: typo fix) |
||
| Line 3: | Line 3: | ||
The following text was written by Dimitri N. "Dema" Elgin, of Elgin Industries, in response to the numerous requests for info on the subject of camshaft selection. It was originally offered for publication in the ''Chapman Report''. | The following text was written by Dimitri N. "Dema" Elgin, of Elgin Industries, in response to the numerous requests for info on the subject of camshaft selection. It was originally offered for publication in the ''Chapman Report''. | ||
| − | Part 3 is written with the [http://en.wikipedia.org/wiki/Lotus-Ford_Twin_Cam '''Lotus/Ford Twin Cam engine'''] in mind, but the reader will be rewarded by looking beyond the type/size of the engine and instead look at the | + | Part 3 is written with the [http://en.wikipedia.org/wiki/Lotus-Ford_Twin_Cam '''Lotus/Ford Twin Cam engine'''] in mind, but the reader will be rewarded by looking beyond the type/size of the engine and instead look at the principles involved. |
==Part 1 -- The Basics== | ==Part 1 -- The Basics== | ||
| Line 39: | Line 39: | ||
===The four timing events=== | ===The four timing events=== | ||
| − | Let us now take the four timing events and put them in order of importance. | + | Let us now take the four timing events and put them in reverse order of importance. |
====Exhaust valve opening==== | ====Exhaust valve opening==== | ||
| Line 74: | Line 74: | ||
;{{Note1}} All dimensions in inches. | ;{{Note1}} All dimensions in inches. | ||
<table table border="1" cellpadding="2" cellspacing="0"><tr bgcolor="#DDDFFF"> | <table table border="1" cellpadding="2" cellspacing="0"><tr bgcolor="#DDDFFF"> | ||
| − | <td width="147"></td> | + | <td width="147">'''Engine'''</td> |
<td align="CENTER" width="130"><font face="Arial"><b>Intake</b></font></td> | <td align="CENTER" width="130"><font face="Arial"><b>Intake</b></font></td> | ||
<td align="CENTER" width="127"><font face="Arial"><b>Exhaust</b></font></td> | <td align="CENTER" width="127"><font face="Arial"><b>Exhaust</b></font></td> | ||
| − | <td align="CENTER" width="127"><font face="Arial"><b> | + | <td align="CENTER" width="127"><font face="Arial"><b>Exh. vs. intake flow</b></font></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td width="147"><font face="Arial">Standard | + | <td width="147"><font face="Arial">Standard</font></td> |
<td align="CENTER" width="130"><font face="Arial">1.53</font></td> | <td align="CENTER" width="130"><font face="Arial">1.53</font></td> | ||
<td align="CENTER" width="127"><font face="Arial">1.32</font></td> | <td align="CENTER" width="127"><font face="Arial">1.32</font></td> | ||
| − | <td align="CENTER" width="127"><font face="Arial">86</font></td> | + | <td align="CENTER" width="127"><font face="Arial">86%</font></td> |
</tr> | </tr> | ||
| − | <tr> | + | <tr bgcolor="#F1F1F1"> |
| − | <td width="147"><font face="Arial">Sprint | + | <td width="147"><font face="Arial">Sprint</font></td> |
<td align="CENTER" width="130"><font face="Arial">1.56</font></td> | <td align="CENTER" width="130"><font face="Arial">1.56</font></td> | ||
<td align="CENTER" width="127"><font face="Arial">1.32</font></td> | <td align="CENTER" width="127"><font face="Arial">1.32</font></td> | ||
| − | <td align="CENTER" width="127"><font face="Arial">84</font></td> | + | <td align="CENTER" width="127"><font face="Arial">84%</font></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td width="147"><font face="Arial">"Racing" | + | <td width="147"><font face="Arial">"Racing"</font></td> |
<td align="CENTER" width="130"><font face="Arial">1.625</font></td> | <td align="CENTER" width="130"><font face="Arial">1.625</font></td> | ||
<td align="CENTER" width="127"><font face="Arial">1.375</font></td> | <td align="CENTER" width="127"><font face="Arial">1.375</font></td> | ||
| − | <td align="CENTER" width="127"><font face="Arial">84</font></td> | + | <td align="CENTER" width="127"><font face="Arial">84%</font></td> |
</tr> | </tr> | ||
| − | <tr> | + | <tr bgcolor="#F1F1F1"> |
| − | <td width="147"><font face="Arial">Brian Hart | + | <td width="147"><font face="Arial">Brian Hart-built</font></td> |
<td align="CENTER" width="130"><font face="Arial">1.690</font></td> | <td align="CENTER" width="130"><font face="Arial">1.690</font></td> | ||
<td align="CENTER" width="127"><font face="Arial">1.44</font></td> | <td align="CENTER" width="127"><font face="Arial">1.44</font></td> | ||
| − | <td align="CENTER" width="127"><font face="Arial">85</font></td> | + | <td align="CENTER" width="127"><font face="Arial">85%</font></td> |
</tr> | </tr> | ||
</table><br> | </table><br> | ||
Your Privacy Choices