I had been poking around to see if I could get a sensor in through the fuel pump port to read the fuel pump eccentric and serve as a cam position sensor. This was something that sounded workable but I figured I'd need to do a lot of work with a threaded sensor to adjust the sensor gap. But after a few measurements, I found that a Hall effect sensor we sell where I work happened to be just the right length.



I just needed to drill and tap two holes in my fuel pump block off plate.



View from inside the motor.



I was able to confirm it triggers with a volt meter.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project

Good tips there Matt,

Thanks for sharing.

I will probably "borrow" / recycle that approach some day.

Greg

_________________
http://www.youtube.com/hyperpack

Nice tip Matt, can you post a part number and source ( DIYAUTOTUNE?) for that sensor?

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

Most likley This one

Greg

_________________
http://www.youtube.com/hyperpack

Wow, super cool! I will likely use this on Project V as I wire up the MS3X soon.

Lou

_________________
Home of Slant6-powered fun machines since 1988

Correct, it's the sensor in Greg's link.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project

It would be interesting to see what the pulese looked like on a scope, especially whit the engine running.

_________________
-MattMan
LEANED & MEAN

Yep.....

Doesn't seem like it would have a distinct enough signal because of the gradual change in distance from the sensor.

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Since this is a Hall effect, the waveform will be a 0-12 volt pulse once per cam resolution - I was able to confirm it transitions properly in a low speed test, although it's possible you may get a few noise pulses at the edges. The real question will be how stable it is. The MS3 with a missing tooth crank trigger allows for a lot of tolerance on the edges - even if these change by 60 degrees or more, you can still get a stable enough reading in the center of the lobe.

Once I have the engine running, I plan to use the VVT mode (intended for cams with hydraulically adjustable advance) to see if I can get a read on how stable the trigger edges turn out to be.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project

If one planned on using a cam for this explicit purpose a more finite edge could be ground into that pump lobe if needed correct?

Greg

_________________
http://www.youtube.com/hyperpack

Yeah, good idea. Could be done by hand with a die grinder or even bench grinder.

Lou

_________________
Home of Slant6-powered fun machines since 1988

Yes, but this should work fine for anything short of putting a hydraulic VVT actuator on your cam sprocket or attempting to data log your timing chain stretch.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project

Yep, Fo' SHo'


Greg

_________________
http://www.youtube.com/hyperpack

Sounds good Matt,

Good luck with the initial drop in and fire up!

Greg

_________________
http://www.youtube.com/hyperpack

I may be wrong, but don't most ECU ignore the cam position sensor once they've already figured it once during start.......

So if the signal is good enough during starting for the ECU to figure out where the engine is in it's cycle, you're good to go.

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes