Distributor Advance curve info

[modnrod]

Hi all.
Dunno where to ask this, but thought some of the info that possibly comes through might help people in this section, so here goes.

This is the dizzy in my car, 1973 "L" Bug or 1303, it's a 205-Z.........


I was wondering if anyone has, or knows where I can go, to find the advance curve characteristics of this dizzy. Vacuum and mechanical advance per rpm, etc.
Once I have that initial info I can play around with springs and vacuum canisters until I hopefully will have what I want.

Thanks in advance. 
 

[Bruce]

Its all in your Bentley manual.

Beware, it has a very SLOW mechanical advance. It's all in at 3800 rpm.  Pull out the points plate and remove one spring.  Then you have an 009 with the benefit of vacuum advance for better fuel economy while cruising.

[modnrod]

With respect Bruce the only info I have so far is that it apparently has the same curve as a Mexican 205ZB, which by my understanding ALREADY has a 009 curve with a vacuum can.

I'll measure springs and weights to find out to be sure I spose.

[Bruce]

When you have the points plate off, compare what you see with an 009. 
I bet the vacuum dist will have two springs.

[glenn]

Come on B\ruce, you know there's more to a distributor than the number of springs.

[modnrod]

Thanks anyway, I was probably just being lazy asking for info!  
I'll curve it the way I want.

[Bruce]

Come on B\ruce, you know there's more to a distributor than the number of springs.

Absolutely true.
I got lucky when I took a stock 74 single vacuum/mechanical distributor and tested it in my engine.  It's mechanical advance was all-in at 3800 rpm.  Talk about LAZY!  So I took out one spring and bingo, all-in at 2500 rpm.  SOTP dyno testing showed no difference between it and the old German 009.  But way better fuel economy!