Re: Flywheels

[AlfaNeely@domain.elided]

In a message dated 10/12/2002 5:41:32 PM Central Daylight Time, C2slayman 
writes:



> 
> Hey Russ,
>     Hmmmm....  I'm not sure about this.  I had a hell of a time with my 
> flywheel when I had it lightened (doh!)  I lost the TDC mark and the 
> mounting point of the trigger pin receded.  So I had to make sure I shimmed 
> the trigger pin correctly.  I recall that my reference point for shimming 
> the trigger pin was to measure the gap between the tip of the ring gear 
> teeth and the ring gear sensor with a piece of clay.  I then used that gap 
> to figure out how many washers I had to put under the trigger pin to get it 
> close enough to it's sensor.
>     On my bellhousing, I'm pretty sure the two sensors have different 
> setbacks from the mounting flange to the engine.  I'll double check next 
> time I'm under the car.
> 
> Cheers,
> 



       You are absolutely correct.  I owe you an apology and I will send this 
to Alfa Digest to apologize publicly.  You were not wrong in your previous 
posting.
       I have a transmission torn down in the garage.  The upper hole on the 
bellhousing is 11/16 inch back from the mounting flange.  The lower hole is 1 
1/2 inches back.  Measuring the 85 engine also sitting in my garage, the 
upper sensor is directly over the flywheel teeth and the lower is over the 
trigger button.
       I just wonder how or why the tach counts the flywheel teeth.  There 
are 131 to count for each revolution whereas counting only one trigger per 
revolution would be easier even for a computer.
       The upper hole on the bellhousing is the rev transmitter.  It has a 
black plug to the wiring loom.  The lower sensor is the "Reference point 
transmitter" and it has a gray connector.

       I am also curious as to exactly how the trigger is attached to the 
flywheel.  How did you remove yours and how did you reattach it?
       I have thought about moving it to get more ignition advance on my race 
car.  But it would probably be easier to switch to a normal distributor with 
a quicker advance curve and get rid of the ignition computer.

Ciao,
Russ Neely
Oklahoma City
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