Lately I've been stuck doing other things.. BUT I wanted to let everybody know what I was up to..making a crank trigger wheel.
Last pics in my yahoo set at
http://4btswaps.com/forum/showthread.php?t=1894
I had a .250 thick aluminum plate spun on a lathe to 8" (just bigger then crank pulley) I'm going to thread 4 bolts into it (4 because the HEI dist. gave out 8 pulses fer revolution).
The spacer was made out of aluminum as well.. (3.5" x 1") (5/8" or 16mm center hole)
The magnetic sensor (VR) was found on Ebay for $20 (originally from a Onan/cummins generator governor). Sensor will be wired to an HEI module on a heatsink mounted somewhere in the engine bay. The reason for this is the magnetic variable reluctance sensor (as well as the HEI pick coil) put out an AC sine wave and the factory TBI ecm is looking for a DC square wave...the HEI module does this for us.
basically this will let me use my factory tach
AND tell the TCI trans controller what RPM the engine is at to control the 4l60E.
Next up..TPS and fabbing a bracket for it.