[Diy_efi] 2.0 diss module with the 1227749

[Garfield Willis]

On Fri, 13 Sep 2002 20:53:54 +0100, "William Shurvinton"
<shurvinton at orange.net> wrote:

>If you are using a GM DIS it uses a hall effect sensor. These give a TTL
>output. GM crank wheels are very small as they fit behind the balancer =
wheel
>in most cars.

I don't know about very modern versions, but the original GM DIS systems
used VR sensors, not hall. And the wheel is part of the crankshaft; the
VR sensor pokes *thru* the crankcase wall to point at the timing wheel
on the crank. That's why GM DIS VR sensors have an o-ring on them, to
keep crankcase oil from leaking out past the sensor.

>A reluctor is more speed controlled.

Yes, but as has been pointed out, the angular velocity isn't changing
with diameter, and that's the *speed* the VR sensor is seeing. The GM
DIS systems are perfectly reliable at cranking speeds.

Gar


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