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I didn't measure it but from memory it was a few mm. Certainly much more than I would expect for random variation. If it had been clipped to #1 lead, I would definitely have readjusted the timing. Mine idles steadily - no hunting around, so I don't think distributor wear would have come into it. I suppose about 1/8" would be about right for 2 degrees, as the 10 degree mark is maybe 5/8" from TDC (mental estimate - it's raining here at the moment!). I just remember noticing it wasn't lined up, and realising it was the 'mythical' retardation on #3 that we had often spoken about. Someone else confirmed they had observed it for themselves maybe 6 months ago on the list, but I think it's something you have to notice for yourself to believe! #2 and #4 are trickier as there's no set position for 180 crank degrees out from the normal timing mark - could certainly compare them, and make a shrewd guess compared with the position on the balance moulding. Interesting that Russ has found a definitive reference to 2 degrees; a lot of the comments I've seen in the past have said 3 degrees - maybe that's true of the Bug. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> To: <type3@vwtype3.org> Sent: Thursday, February 10, 2005 3:57 AM Subject: Re: [T3] Distributor Drive Question > On 9 Feb 2005 at 23:52, Dave Hall wrote: > > > I didn't believe it either, Jim, until I actually tried the spark on no. 3 when > > checking the timing. It's certainly retarded on mine compared with no. 1. Easy > > enough to take a look next time you've got the timing light out. '71 dual vac > > on twin carb 1600 original un-messed with engine. > > I thought I'd done that, but I'll have to try it again. OTOH, it might just be > in the carbed engine, although I can't imagine why. > > There is also the possibility that there is a bit of manufacturing tolerance or > wear in that cam, too. Have you compared # 2 to # 4? That would give us some > idea of the tolerance. To be sure of this, we'd need several consistent > samples. > > How much distance on the pulley rim does this retard amount to? Wasn't this > supposed to be 2-3 deg? > > -- > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~