[urq] RE: ref sensors/signal timeing [was] First of many urq questions..]

[Ben Swann]

Steve E. ,

Although this is thekind of answer I was grasping for while trying to answer, I question how this can be if the flywheels are changed.  The earlier WX had the reference sensor located at the top of the bell housing  lets say around 70 deg before TDC, and therefore I would expect  the flywheel would have the pin located 10 deg after TDC on the flywheel to get 60 deg.

The MC is located lets say for argument 10 deg after TDC and therefore the pin would need to be located 72 deg before TDC.

The number I'm using are to make the math easier, but mainly that the flywheel pin locations have to be different on the two engines in order to come up with nearly the same ref. signal 60 vs. 62, as the actual sensors are located in way differnt locations, one being before TDC - almost behind the head, and the other being after TDC closer to the oil pan.

Correct me if I'm wrong here, as I may be missing something, but i don't think you can swap flywheels on the engines unless swapping the location of the reference sensor, to come up with nearly the same signal (different only by 2 deg.)

When I pull the WX out of my '83 I'll be able to compare flywheels, but that won't be for a while.

Ben

[From: Steve Eiche [mailto:seiche at shadetreesoftware.com] 
Sent: Tuesday, April 06, 2004 4:21 PM
To: Steven.Buchholz at kla-tencor.com; 'urq at audifans.com'
Subject: RE: [urq] First of many urq questions (food for thought..)

Steve,

Yes, WX flywheel has the timing pin at 60 degrees BTDC.  The later cars (MC, 3B, AAN, ABY, etc.) all have the timing pin at 62 degrees BTDC.  The only effect of using a late flywheel with WX/WR electronics would be that the timing would be advanced by 2 degrees.

Steve

... I don't have the references here to back me up, but it has always been
my understanding that the WX and MC engines differ in the location of the
"reference" signal as measured to the actual TDC of the crankshaft ...

Steve B
San José, Kaleefohnia (USA)]