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

[Ben Swann]

OK - I see. then all things considered, the signals should be relatively the
same, except for a 2 degree reference signal descrepancy.

Thanks.

Ben
----- Original Message ----- 
From: "Steve Eiche" <seiche at shadetreesoftware.com>
To: "Ben Swann" <benswann at comcast.net>
Cc: "Steven. Buchholz (E-mail)" <Steven.Buchholz at kla-tencor.com>;
<urq at audifans.com>
Sent: Wednesday, April 07, 2004 11:23 AM
Subject: Re: ref sensors/signal timeing [was] First of many urq questions..]


> Ben,
> You are thinking of the flywheel speed sensor that reads the flywheel
> teeth.  This is on the top of the bell housing on the WX.  It really
> doesn't matter where this sensor is placed, as the flywheel teeth are
> evenly spaced with no gaps.  The timing reference sensor is located in
> the same place on the WX as later cars.
>
> Steve
>
> Ben Swann wrote:
>
> > 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
> > <mailto:Steven.Buchholz at kla-tencor.com>; 'urq at audifans.com'
> > <mailto:%27urq at audifans.com%27>
> > 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)]
>