[T3] On my 73 square , what should I look at on the breather with a PCV?

Jim Adney jadney at vwtype3.org
Wed Sep 11 07:46:10 PDT 2019


Keith,

Yes, really. The '72-3 distributors have the FI trigger cam rotated on the 
lower shaft by something like 15 degrees, which makes for 30 crankshaft 
degrees. The difference is easy to see when you compare lower shafts from 
different distributors. This change was for the 311 AE, AF, AG, and AH 
distributors. This was done so that all 4 injectors fire onto the backsides of 
CLOSED intake valves, so each cylinder worked the same.  

I don't know about Type 4 distributors. I assume they got the same treatment 
at some point. 

How did you make the change in your Type 4 distributor? Given how little 
difference it made in Type 3 engines, I'm skeptical that it would make a big 
difference in Type 4 engines. Any chance you just had a set of trigger points 
that was worn out of adjustment? THAT will certainly make for really poor 
operation.

Jim

On 10 Sep 2019 at 21:03, Keith Park wrote:

> Really?  I didnt know this.
> With the 2056 and the Raby 9550 cam, advancing the injector timing makes a
> HUGE difference, I probably have it 10-15 degrees advanced from stock now
> so that it runs properly and doesnt miss.
> 
> Keith
> 
> > I read on rennlist about the slop where the trigger points mount that
> > it should be set to the center point since it will alter the point when
> > the injectors fire .
> 
> That's a red herring, because Bosch advanced the injector timing by about 
> 30 degrees in '72. That huge change made only a tiny difference, and then 
> only when the engine was cold.
> 
> 
> 
> _______________________________________________
> VWType3.Org mailing list - type3 at vwtype3.org
> To unsubscribe or change subscription options, visit:
> http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org
> If you need more help, contact: gregm at vwtype3.org


-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************



More information about the type3-vwtype3.org mailing list