Another crazy Magnum SMPI swap idea. Crank position sensor location.

Some may remember a thread I started about trying to find a way around the crank pickup problem while trying to swap the Magnum SMPI stuff onto the motor in my 4 speed Duster - http://www.forabodiesonly.com/mopar/showthread.php?t=78887 .

I'm still trying to work around this problem as I don't want to have to go to a 143T flywheel. So, I had decided that I was going to relocate the crank pickup to the front of the motor at the pulley by putting holes in the barrel shaped area of the crank pulley similar to what the flexplate has, only on a smaller scale. The problem with that idea is that it will require a pretty sophisticated mount for the pickup as there really isn't a good surface to mount it to, plus the pickup would be in the way of lots of things on the front of the motor (water pump, etc.).

So, I've been debating about trying to mount something to the end of the cam, where the fuel pump eccentric would be if I was running a mechanical fuel pump. At first I had just thought about running a stock Magnum pickup, stuck in the hole that the fuel pump would have used in the timing cover (with a plate to seal the hole and mount the pickup), but I didn't like that idea as it seemed like a difficult place to keep oil from leaking from. Plus, I wasn't sure how I would build a ring to mount to the end of the cam with the holes in it to match what the flexplate has.

Today I started looking for some other pickups that I might use, and found that a Gen III Hemi uses a crank position sensor that appears to be a hall effect pickup similar to what the the Magnum PCM would need to see. From looking at how the Hemi works, it appears that maybe I could do just a flat plate (similar to what the Hemi has bolt to the crank), spaced off the cam sprocket, with 16 notches (because the cam turns at half the speed that the crank does) cut in the circumference, and the Hemi sensor stuck through a tube so that the o-ring seals it. It is much more complex that that, but that should get the idea across.

The only other trick is that I want to use a Magnum timing chain cover so that I can swap the serpentine belt setup onto the motor. The problem is that cover doesn't have a fuel pump mount and hole, so it would require additional machining.

Anyone have a late model Hemi that they could take some measurements off of for me? Need to know how long the sensor is, from the retaining tab to the end of the sensor, and how thick the ring is on the crank that the sensor reads.

Am I completely nuts? ](*,)

I will try and post some pictures tomorrow that might help with the visualization.

Thanks.