JH timing and the Bosch starter

[fahrvegnugen at cox.net (David Utley)]

Not that I have as much experience as either one of you (yes I am serious), but I had a thought too...  What if Gordon timed it by the wrong mark on the flywheel?  I have done that in the past, but I am uncertain that could be done in such a way as to cause the symptoms he is getting...

Just a thought,
  David
> 
> From: "Dan Bubb" <jdbubb@ix.netcom.com>
> Date: 2004/12/07 Tue AM 09:37:08 EST
> To: <gforbess@attglobal.net>,  <scirocco-l@scirocco.org>
> Subject: Re: JH timing and the Bosch starter
> 
> Stock K-Jetronic has no control over ignition timing on a JH.
> 
> It sure sounds like the ignition is pretty advanced while cranking and is causing kickback.
> But, I would think 6 deg BTDC wouldn't be enough to cause that.
> So, I'm wondering how your vacuum advance/retard is set up?
> The advance is getting ported vacuum? And the throttle plate is adjusted correctly so there isn't
> any vacuum advance at idle? Vacuum lines all hooked up per Bentley?
> Just throwing some thoughts out since it sounds like alot more advance during cranking than with the
> engine idling and the vacuum advance/retard seems like the only thing that might effect that.
> HTH.
> Dan
> 
> ----- Original Message -----
> From: "Gordon Forbess" <gforbess@attglobal.net>
> To: <scirocco-l@scirocco.org>
> Sent: Tuesday, December 07, 2004 12:25 AM
> Subject: JH timing and the Bosch starter
> 
> 
> Here's my question:  Does the K-Jetronic (that's the one, right?)
> system that ran the stock JHs retard the timing during the start
> cycle?
> 
> If so, that might explain the behavior in my completely computerless
> carbureted car (which originally came with a motor set at 3 degrees
> ATDC).  My motor runs great at 6 degrees advanced (recently reset from
> about +2 degrees) and I've checked it twice after a drive to make sure
> it's spot on the mark on the flywheel.
> 
> The nasty behavior is that the starter now "bogs" on the initial try
> and stops.  Often, just trying it again will start the motor, but the
> "bog" is still there.  I'm thinking with the 6 degrees advanced
> timing,  it is firing on the compression stroke and fighting the
> starter motor.
> 
> Another clue:  If I cut my "secret kill switch" (which interrupts 12v
> to the coil) and crank the motor, the starter spins it very fast.
> Then quickly flipping the switch back to the "run" position while
> still cranking, the motor fires normally.  No bogging down at all.
> 
> To eliminate other possible problems, I have recently replaced both
> battery cables, the ground from alternator to block and added another
> ground from the alt case to the body.  Also checked and cleaned all
> connections.  In addition, I've added a relay to supply the starter
> solenoid circuit so it doesn't let go when the voltage drops when the
> starter motor gets powered. (This is evidently a problem well known on
> certain Bosch starters and VW actually sells a kit with relay and
> wiring harness)   The battery is nearly new, is fully charged and my
> voltmeter says the charging circuit is working well.
> 
> 
> 
> 
> 
> Gordon
> 75 Scirocco/Drake 1.9 8V
> http://pws.prserv.net/scirocco/scirocco.htm
> 
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