SVDA distributor help

[starrider1946]

svda distributor

Thanks for the help. I have a 160 air corrector, 130 main and a 52 idle jet. I don't know what increments they have on the idle jets. I don t mind buying more idle jets if that's what it takes. If I increase the idle size should I leave the main alone. We used to have a hobby here you could buy the pin drills in thousand increments but it closed. Wonder if I should try a 55 idle jet or maybe something little larger.

Stock jets on a 35 PICT 3 are 55 and 127.5. Just re-jetted ours to 60 and 130 and got rid of the stumble. Finally!!epper: Now...on to other bugs to work out!! LOL!!

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OOPS!! Meant to say a 34 PICT 3!! Duh!! :blush:

 

[Loner]

Normal ranges for 34 carbs are 130-145 main and 55-60 idle jets. Your 'lag' spot in the power curve is generally caused by running too lean at some spot in the transition from idle to main. With dual carbs, I would not be afraid to go to the max on idle (~60) and maybe 140 on main jetting. As you've found sometimes the only way to find the best performance is a bit of trial and error (of course, with the jets running $6-10 apiece now you want to hit the right combo ASAP).

There also is a trick that can help the flat spot that is usually limited to when using an 009 distributor with a stock carb. If your carb butterfly has a small hole in it near the center area (I'm not sure on the dual 34 carbs), it is there to increase the air to fuel ratio at low and transitional speeds (i.e., lean it out). Why the carb manufacturers chose to use such a 'bandaid' fix is beyond me when they designed the carb. But, by soldering closed that hole you are richening the low speed mixtures across the board. As stated it often removes the flat spot caused by the slow to advance 009 dizzy, but might work for you if you expend other tuneable alternatives.

As to just finding a quick way to test if you are truly sluggish because of lean mixtures, just adjust your choke(s) to stay closed slightly (maybe 1/4) when running and see what happens. That will make for a richer mixture and will possibly validate that you are indeed running too lean in the lower power curve. Temporary adjustment, don't leave them that way even if it runs beautifully.

Just my no-risk ramblings. No blame if I'm wrong and no charge if I'm right.

 

[vw driver]

Have you set the volume and bypass screws on the carbs? Here is a good link explaining 34pict3 adjusting.
http://www.vw-resource.com/34pict3.html#carb