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Fri Mar 19, 2010 11:41 am

Stray Catalyst wrote: I have a 74 standard beetle, 1600DP, 009, 34PICT-3.

The 009 and 34 PICT-3 is not a good combination. You should use the SVDA ditributor.

I don't think this is your main problem, though.

In case you still look for air leaks, beware one source that many forget on late models: The thermostatic valve and the vacuum flap in the air filter. Try to block off the tube (either on the carb or on your intake) and see if that helps.

Fri Mar 19, 2010 11:49 am

I have a freshly rebuilt SVDA to install in this bug, as soon as I have the carb problem solved. I agree with you, and fully intend to replace the dizzy - but I want to solve the problem before I try to change it, as I want the rest of the engine running as well as possible before I make that swap.

Stray

Sun Mar 21, 2010 12:33 pm

Curiouser and curiouser.

I got out the SVDA, which has a SECOND vac inlet (I think) on the back of the same can that has the first inlet, which is in the usual location. Is this actually a DVDA, or do I block that one, or just leave it open?

Stray

Sun Mar 21, 2010 2:13 pm

Stray Catalyst wrote: Curiouser and curiouser.

I got out the SVDA, which has a SECOND vac inlet (I think) on the back of the same can that has the first inlet, which is in the usual location. Is this actually a DVDA, or do I block that one, or just leave it open?

Stray

I think you can use the DVDA. You need an extra vacuum outlet on your carb to connect it. If not, leave the dizzy vac inlet open. I read somewhere that the function of the extra vacuum clock is to make the timing return more gently back to "idle position". Not sure.

Read this - timing si different with DVDA: http://www.thesamba.com/vw/forum/viewtopic.php?t=251672

Sun Mar 21, 2010 4:15 pm

http://www.vw-resource.com/carb_dist.html

Sun Mar 21, 2010 4:52 pm

Thank you for the link, that clears up some of my mistakes. :)

Stray