In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote: bennettdan, Those IGBT's should work fine to drive to ignition coil. For you truck motor, not sure of the model and year but it still may have a centrifugal advance located below the breaker plate. This would handle the spark advance with RPM but not with throttle position. In the past that was handeled with a venturi vacuum applied to a diaphram attached to the breaker plate. For injection timing, all manufactures today use sequencial injection timing. Even though this is common, when to inject the fuel varies alot. At Ford we calculated when the end of injection would occur the started the injection so that it would finish before the intake valve opened. This provided the longest resident time for most of the fuel to vaporize. At WOT and higher engine speeds this is not possible since injectors are just about full on (90%). That is if the injector is sized properly for the engine. Small enough so that idle pulse width is gearter 1ms and peak pulse width approaches approx 90% injector on time. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=192262#m194120 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)