VR Sensor to Trigger Tooth Relationship

Mechcano · Post by **Mechcano** » Tue Sep 11, 2007 11:46 am

When positioning the VR sensor above it's trigger tooth (50degs for a V8 ), where should the centre line of the VR sensor point too?

The top leading edge of the tooth.
The centre of the tooth.
The top trailing edge of the tooth.

Thanks in advance.
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Gilesy998 · Post by **Gilesy998** » Tue Sep 11, 2007 1:52 pm

The centre of the tooth.

MartinM · Post by **MartinM** » Tue Sep 11, 2007 3:01 pm

Either:
a) Choose your sensor mounting position and install the sensor
b) Set the engine to TDC
c) Connect (loosely) the trigger wheel to the crank
d) Rotate the trigger wheel (only) until the VR sensor points at the middle of the tooth that is 5 before where the missing tooth would be (if it wasn't missing, that is)
e) Secure (tightly) the trigger wheel to the crank

Or

a) Secure (tightly) the trigger wheel to the crank
b) Set the engine to TDC
c) Find the middle of the tooth that is 5 before where the missing tooth would be (if it wasn't missing, that is)
d) Mounting the sensor at that position

Cue multiple posts on what 'before' means.....

Mechcano · Post by **Mechcano** » Tue Sep 11, 2007 11:38 pm

Thanks for the quick response.

So it's now align as per the photo.

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MartinM · Post by **MartinM** » Wed Sep 12, 2007 12:14 pm

If you're at TDC in that picture and the engine rotates clockwise, the that looks absolutely perfect...

...and should be often quoted as the de facto reference picture on how to set up a V8 VR sensor

Post by **brentp** » Wed Sep 12, 2007 2:17 pm

Nice. If all engines had such a great place to mount a sensor! It should work well for you.

May I use this photo in the installation documentation?

Thanks,

Mechcano · Post by **Mechcano** » Thu Sep 13, 2007 12:43 am

Martin, yes the engine is at TDC in the photo.
Brent you can use this and any other photo's as you wish.

One other thing, testing the VR sensor after installation.

I connected a digital volt meter set on AC volts directly to the VR sensor. With the engine at idle about 800 rpm i was reading 9.4V and when i raised the revs to about 1800 rpm i was reading 18.9V. Is this what i should expect

Micheal
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MartinM · Post by **MartinM** » Thu Sep 13, 2007 10:09 am

That sounds about right - I think they can even give 30 or 40 volt pk-pk output (no decent current though!) at higher rpms.

But as they're completely passive devices and integrate into directly to the EDIS (ie it's a complete Ford design at this point) then I'm absolutely sure there's nothing wrong