Cam sync sensor on 930
 

I'm looking for a good place to mount a Hall cam sync sensor for my new sequential injection EFI system. Has anyone thought of using the housing behind the turbo oil pump (where the pulley resides for running the air injection pump) for this purpose?

Norm

for that matter, you could add a drive hub on the end of the right cam, and mount it there. just pop out the soft plug and use a seal just like the left cam. webcam sells the hub, and can install it on your cam.

Has anyone tried mounting a sensor in the distributor opening? I have HPX coils, and dumped the distributor. I am planning a conversion to EFI and that would seem like the ideal location.

As a follow up...

I decided to use the turbo oil pump pulley housing as above. I found the following elegant solution (at least I like it). Use the pulley housing. Use the following Honeywell parts. Less than $50CA in parts.


Hall effect switch - 103SR13A-2 - NEWARK INONE PART #: 23F2229

Magnet with threaded stud - 102MG11 - NEWARK INONE PART #: 50F5281

Steps:

1. Drill and tap the pulley wheel to accept the threaded magnet stud.

2. Drill hole and mount the Hall sensor in the pulley housing.

3. Adjust the magnet - hall sensor gap.

Let me know what you think.

Norm

If your going EFI with crankfire setup, you can have the distributor body modified. Contact Smart Racing, they do a neat conversion on the housing that eliminates the cap and provides a sync sensor output to your EFI.
Rick
'78 930

With a distributor pickup, I wouldn't think you'd be able to run sequential injection.

Depends upon the system. Granted, my Motec system also requires a crankshaft sensor but is fully capable of running full sequential ignition with low impedance injectors.
Rick
'78 930

OK Rick, you've peaked my interest. What system can run sequential without a cam pickup?

Norm, sounds like a plan...

Clewett makes a cam trigger, you would have to give up your engine mounted cooler to use it though...

mounting a mag bolt in the air pump pulley is a good solution

also you can use an old distributor for the sync signal.... the distributor is nice, because you can adjust so that the home and sync signal are in phase..

If you mount the mag bolt in the air pump pulley, youll have toallow adjustment in the hall sensor, so that you home and sync signals occur at the proper time.

What you need is a distributor pickup to run sequential injection. For every two crank revolutions you get one revolution of the distributor. As I am sure you know, in 4 stroke engines you you have one power stroke for every two revolutions. To get that power stroke, the rotor within the distributor must be centered on the ignition wire to be fired. This happens once every two revolutions. Therefor, if you were to place a sensor on the shaft of the distributor, line it up with cylinder one, by definition, you could time the injector pulse to correspond to the appropriate cylinder.

I am running a Motec M600 with distributor and crankshaft sensor. That unit is capable of running in full sequential mode. Check with Smart Racing for the distributor modification. It's a very clean solution.
Rick
'78 930

Rick, I couldn't find anything on the Smart Racing Products site about the distributor pickup, but I found most everything else including that Jerry Woods is a partner. I guess that pretty much says it all.

Since you're using the M600 box, I get the impression that the distributor system is not for the budget challenged. :)

From your post it doesn't sound like you're running in sequential mode. With the turbo motor I would think you would so you could run larger injectors. Are there reasons not to?

The distributor mod is not listed in their catalogue, but they offer the service for $350-$450. I will be running sequentially. The nice thing about the Motec unit is that it can support the low impedance injectors without an ignition expander. They have made some real progress with the new units.
Rick
'78 930