[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.
>
>
>
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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