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PostPosted: Fri Apr 23, 2021 11:58 am 
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TBI Slant 6

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Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
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.

Image

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

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View from inside the motor.

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

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PostPosted: Fri Apr 23, 2021 12:45 pm 
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Supercharged
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Good tips there Matt,

Thanks for sharing.

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

Greg

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PostPosted: Fri Apr 23, 2021 6:58 pm 
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Supercharged

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

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PostPosted: Sat Apr 24, 2021 4:21 am 
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DadTruck wrote:
Nice tip Matt, can you post a part number and source ( DIYAUTOTUNE?) for that sensor?



Most likley This one

Greg

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PostPosted: Sat Apr 24, 2021 11:23 am 
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Wow, super cool! I will likely use this on Project V as I wire up the MS3X soon.

Lou

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PostPosted: Mon Apr 26, 2021 12:51 pm 
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TBI Slant 6

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

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PostPosted: Mon Apr 26, 2021 1:48 pm 
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Car Model: 1965 Plymouth Belvedere I
It would be interesting to see what the pulese looked like on a scope, especially whit the engine running.

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PostPosted: Mon Apr 26, 2021 5:30 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
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Car Model: 64 Plymouth Valiant
Badvert65 wrote:
It would be interesting to see what the pulese looked like on a scope, especially whit the engine running.



Yep.....

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

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PostPosted: Tue Apr 27, 2021 6:43 am 
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TBI Slant 6

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Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
Badvert65 wrote:
It would be interesting to see what the pulese looked like on a scope, especially whit the engine running.


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.

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PostPosted: Wed Apr 28, 2021 7:17 pm 
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Supercharged
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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

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PostPosted: Thu Apr 29, 2021 3:22 am 
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Yeah, good idea. Could be done by hand with a die grinder or even bench grinder.

Lou

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PostPosted: Thu Apr 29, 2021 7:23 am 
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Greg Ondayko wrote:
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


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.

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PostPosted: Thu Apr 29, 2021 7:30 am 
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Dart270 wrote:
Yeah, good idea. Could be done by hand with a die grinder or even bench grinder.

Lou



Yep, Fo' SHo'


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PostPosted: Thu Apr 29, 2021 7:31 am 
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MadScientistMatt wrote:
Greg Ondayko wrote:
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


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.



Sounds good Matt,

Good luck with the initial drop in and fire up!

Greg

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PostPosted: Thu Apr 29, 2021 4:09 pm 
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Car Model: 64 Plymouth Valiant
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.

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